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Topic: Security

O'Reilly Network articles about this topic:

Secure Your Linux Server (Linux DevCenter)
Linux is a powerful and popular operating system kernel. That popularity means you might be running it even if you're not a dedicated Unix administrator or high-powered programmer. That doesn't mean that rock-solid security is out of your reach, though. Aaron Brazell shows how to make Red Hat 9 (and other Linux distributions) much more secure in a few easy steps.

PHP Problems (Linux DevCenter)
Noel Davis looks at problems in PHP, Emacs, ftpd-ssl, Lynx, Roaring Penguin pppoe, OpenVPN, RAR, Fedora Core X-Chat, HP-UX xterm, libungif4, and GpsDrive.

Ethereal Trouble (Linux DevCenter)
Noel Davis looks at problems in sudo, Ethereal, Apache mod_auth_shadow, fetchmailconf, lynx, Mantis, pnmtopng, gnump3d, Squid, unzip, uim, Curl, and imlib.

KWord Trouble (Linux DevCenter)
Noel Davis looks at problems in KWord, SPE under Gentoo, wget, Brightstore, eTrust, Unicenter, OpenSSL, XMail, uw-imap, weex, tcpdump, graphviz, up-imapproxy, xloadimage and xli, and Ruby.

XFree86 Trouble (Linux DevCenter)
Noel Davis looks at problems in XFree86, cfengine, RealPlayer 10, Helix Player, ClamAV, XSun, Xprt, arc, prozilla, AbiWord, Backupninja, Hylafax, ApacheTop, and libsnmp5.

Company-Wide Instant Messaging with Jabberd (ONLamp.com)
Instant messaging is becoming as valuable a business tool as email, the telephone, or the computer. While public networks are free (but not under your control) and private installations are under your control (but expensive), you can easily run your own secure, free server using the open standards of the Jabber protocol. Oktay Altunergil shows how to install and configure jabberd and to integrate it into an existing business directory system.

MySQL Trouble (Linux DevCenter)
Noel Davis looks at problems in MySQL, umount, KDE's kcheckpass, GNOME Workstation Command Center, X.org, Squid, TWiki, ncompress, grip, Turquoise SuperStat, gtkdiskfree, and LessTif.

Problems in PCRE, the Linux Kernel, and SILC (Linux DevCenter)
Noel Davis looks at problems in PCRE, the Linux kernel, SILC, Frox, MPlayer, pam_ldap, maildrop, lm_sensors, simpleproxy, backup-manager, Adobe Version Cue, phpGroupWare, and webcalendar.

PHP Trouble (Linux DevCenter)
Noel Davis looks at problems in PHP, Adobe Reader, Kismet, LibTIFF, Evolution, Mutt, bluez-utils, Ignite-UX, CPAINT, Awstats, Clam AntiVirus, and Gaim.

Apache Trouble (Linux DevCenter)
Noel Davis looks at problems in Apache, bzip2, Cisco devices, fetchmail, Netpbm, Ethereal, Proftpd, pstotext, apt-cacher, Compress::Zlib, Gopher, nbSMTP, and PowerDNS.

Problems in Oracle Reports (Linux DevCenter)
Noel Davis looks at problems in Oracle Reports, Skype for Linux, MediaWiki, Kate, Kwrite, Shorewall, ekg, libgadu, PHPNews, phpSurveyor, Affix, Heartbeat, and phpPgAdmin.

Problems in SpamAssassin, PEAR, and Bugzilla (Linux DevCenter)
Noel Davis looks at problems in SpamAssassin, PHP PEAR, Bugzilla, Heimdal/Kerberos telnetd, Vipul's Razor, TikiWiki, poppassd_pam, zlib, FUSE, the Solaris kernel, HT Editor, GNATS, JBoss jBPM, Trustix Secure Linux, and Trac.

Problems in OpenSSH, Sudo, and Java (Linux DevCenter)
Noel Davis looks at problems in OpenSSH, Sudo, Sun Java, Blackdown Java, tcpdump, cpio, JBOSS, Adobe Reader and Acrobat, gedit, Gaim, and Trac.

Problems in the Kernel, OS X, and WordPress (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, Mac OS X, bzip2, WordPress, WebSphere, Peercast, PHPMailer, Binutils, Popper Webmail, Dzip, and FreeBSD's gzip.

Problems in the Linux Kernel, LISTSERV, and gdb (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, LISTSERV, gdb, FreeRADIUS, shtool, mailutils, Qpopper, davfs2, libmagick6, picasm, cheetah, and ppxp.

Mozilla and Firefox Flaws (Linux DevCenter)
Noel Davis looks at problems in gzip, Mozilla and Firefox, OpenOffice.org, the FreeBSD kernel, Ethereal, TCPDump, libTIFF, Smail, Apache2's htdigest, and SCO UnixWare's chroot.

CVS Trouble (Linux DevCenter)
Noel Davis looks at problems in CVS, PostgreSQL, Squid, Gaim, Debian's lsh, Xine-lib, Caroline, Convert-UUlib, Rootkit Hunter, snmppd, Kommander, kimgio, RealPlayer, Helix Player, xli, and Debian's samba.

PHP, cpio, and rsnapshot Trouble (Linux DevCenter)
Noel Davis looks at problems in PHP, cpio, rsnapshot, Gld, Axel, Domino, BrightStor ARCserve Backup, xv, Pine, GnomeVFS, libcdaudio, FreeBSD's ifconf, libexif, and monkeyd.

Userspace Filesystem Encryption with EncFS (Linux DevCenter)
Laptops and removable storage devices are convenient both for users and for thieves. While you can't always protect the device from wandering away, you can protect the data. EncFS, a user-level encrypted filesystem in a file, makes this possible. KIVILCIM Hindistan explains how.

Linux Kernel Vulnerabilities (Linux DevCenter)
In Noel Davis' latest column, he looks at problems in the Linux kernel, Telnet, sharutils, Ethereal, Midnight Commander, mpg321, OpenMosixView, cdrecord, ImageMagick, and grip.

Extreme System Administration (SysAdmin DevCenter)
Learning from programmers seems like a horrible idea, but good developer teams work together productively to solve problems effectively and more efficiently than they could on their own. Why shouldn't system administrators borrow some of that magic? Andrew Cowie suggests that some ideas from Extreme Programming and Agile Development can improve the lives of SAs.

KDE Trouble (Linux DevCenter)
Noel Davis looks at problems in KDE, MySQL, Perl, Ximian Evolution, GnuPG, OpenSLP, Ringtone Tools, LuxMan, and Ethereal.

Problems in GProFTPD (Linux DevCenter)
Noel Davis looks at problems in GProFTPD, bsmtpd, Uim, phpMyAdmin, Vim, Cyrus IMAPd, the Kodak Color Management System on Solaris, Arkeia Network Backup, curl, and PuTTY.

Trouble in the Kernel, VMware, and PostgreSQL (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, VMware, PostgreSQL, Squid, MySQL, mailman, Apple OSX HFS+, movemail with GNU Emacs or XEmancs, KStars, typespeed, awstats, and synaesthesia.

Perl Trouble (Linux DevCenter)
Noel Davis looks at problems in Perl, PostgreSQL, ncpfs, Squid, cpio, UW IMAP, ChBg, FireHOL, Clam AntiVirus, and f2c.

Linux and Darwin Kernel Trouble (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, the Darwin/Mac OS X kernel, iSync, Ethereal, enscript, hylafax, rssh, Xine-lib, mpg123, and Konversation.

DB2 Problems (Linux DevCenter)
Noel Davis looks at problems in DB2, SHOUTcast, nasm, Vilistextum, libtiff, wxGTK2, phpGroupWare, Vim, namazu2, and htmlheadline.

Linux AMD64 Kernel Bug (Linux DevCenter)
Noel Davis looks at a Linux 2.4 kernel bug on AMD64 machines, problems in Samba, changepassword.cgi, MPlayer, the MIT Kerberos 5 administration library, logcheck, Sybase Adaptive Server Enterprise, Konqueror, Debian debmake, Xpdf, and xzgv.

J2SE Woes (Linux DevCenter)
Noel Davis looks at problems in the Java 2 Runtime Environment, wget, FreeBSD's procfs and linprocfs, OpenSSL, OpenSSH, AbiWord, Blogtorrent, scponly, rssh, and kfax.

ELF Trouble (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, sudo, TWiki, phpBB, cscope, Cyrus IMAP, Bugzilla, ProZilla, unarj, libxml2, and fetch.

Media-Tool Trouble (Linux DevCenter)
Noel Davis looks at problems in libgd, mtink, zip, ruby, Samba, freeamp, Kaffeine and gxine, Portage, zgv, shadow, and BNC.

Trouble in iptables (Linux DevCenter)
Noel Davis looks at problems in Linux iptables, OpenSSL, PuTTY, rssh, Quake II Server, libmagick6, HP Serviceguard, Xpdf, FreeRadius, WVTFTPD, GNU tftp, and pppd.

mod_ssl Problems (Linux DevCenter)
Noel Davis looks at problems in mod_ssl, LibTIFF, mpg123, LessTif, the Cyrus SASL library, MySQL, CUPS, ProFTPD, and the Squid web proxy cache.

Temporary-File Race Conditions (Linux DevCenter)
Noel Davis looks at a collection of temporary-file race conditions, and problems in Samba, GNU sharutils, JRun, Subversion, imlib, IBM AIX ctstrtcasd, YahooPOPs, and OpenOffice.org.

New Apache (Linux DevCenter)
Noel Davis look at problems in Apache 2.x, GNU Radius, libXpm, CUPS, gdk-pixbug, cdrtools, SUS, and Webmin.

Linux Kernel Exploitation (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, Oracle Database Server, Oracle Application Server, DB2 Universal Database, vpopmail, MIT Kerberos 5, cfengine, CDE libDtHelp, Anonymous CVS, Samba, the zlib library, Courier-IMAP, and Python.

Qt Trouble (Linux DevCenter)
Noel Davis looks at problems in Qt, SpamAssassin, MySQL, rsync, NetBSD ftpd, Xine-lib, KDE, Adobe Acrobat Reader, Gaim, and xv.

CDE Trouble (Linux DevCenter)
Noel Davis looks at problems in CDE's dtlogin, Oracle, SquirrelMail, SoX, phpMyAdmin, wvWare, Openftpd, CVSTrac, PostgreSQL's ODBC driver, PuTTY, and Citadel/UX.

PHP Trouble (Linux DevCenter)
Noel Davis look at problems in PHP, Samba, mod_ssl, HP-UX's xfs and stmkfont, Ethereal, l2tpd, Domino, APC PowerChute Business Edition, Webmin, and Lexmark network printers.

Device-Driver Trouble (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, Apache 2, the Linux Virtual Server, Pure-FTPd, FreeBSD's Linux binary compatibility mode, Domino, Shorewall, libpng, and the X Display Manager.

Kernel DoS Vulnerability (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, www-sql, super, rssh, Horde-IMP, GNU GNATS, gzip, ISC DHCP, and sup.

Subverted (Linux DevCenter)
Noel Davis look at problems in Subversion, Apache's mod_proxy and mod_ssl, Squid, MIT's krb5, RealOne, RealPlayer, ksymoops-gznm, smtp.proxy, FreeBSD's Jail(), Aspell, Tripwire, and icecast.

KDE Trouble (Linux DevCenter)
Noel Davis looks at problems in KDE, CSV, Subversion, Firebird, FreeBSD msync(), mailman, Opera, Apple's HelpViewer, cPanel, and xpcd.

Apache Repaired (Linux DevCenter)
Noel Davis looks at a problems with the Apache web server, the Linux kernel, Systrace, ssmtp, exim, SuSE Live CD 9.1, Heimdal k5admind, Kolab, IRIX Networking Security, and NukeJokes.

Distributed Cfengine (SysAdmin DevCenter)
Automation is the most important skill an administrator can develop. Cfengine is great at automation and even supports distributed automation. Luke A. Kanies demonstrates how to distribute Cfengine rules to multiple machines.

TCP Vulnerability (Linux DevCenter)
Noel Davis looks at problems in the TCP protocol, Midnight Commander (mc), proftpd, OpenOffice, libpng, rsync, LHA, Utempter, X-Chat, and sysklogd.

MySQL Trouble (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, MySQL, CVS, Cadaver, subversion, sitecopy, tla, iproute, Zope, logcheck, kdeprint, emil, and GNU Sharutils.

Introducing Cfengine (SysAdmin DevCenter)
Automation is the most important skill an administrator can develop. Learning tools that make automation easier usually pay off greatly. Luke A. Kanies claims that Cfengine may be the most important tool in your toolbox and introduces its use and design.

Squid Security Issues (Linux DevCenter)
Noel Davis looks at problems in squid, Ethereal, monit, texutil, nstxd, eMule, vfte, YaST Online Update, oftpd, OpenLDAP, and MPlayer.

OpenSSL Vulnerabilities (Linux DevCenter)
Noel Davis looks look at problems in OpenSSL, sysstat, metamail, Mozilla, ModSecurity, Samba, Crafty, UUDeview, metamail, and calife.

New Nmap (Linux DevCenter)
Noel Davis looks at a new version of Nmap, problems in jailed processes under FreeBSD, and other problems in Adobe Acrobat Reader, the GNU Coreutils dir command, xboing, Apple Filing Protocol, libxml2, GNU Anubis, Sun's passwd command, and Safari.

Kernel Trouble (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, AMD64 Linux kernels, XFree86, slocate, mod_python, susehelp, mutt, metamail, Mailmgr, PWLib, clamav, and NetBSD's Racoon IKE daemon.

Real Problems (Linux DevCenter)
Noel Davis looks at problems in PHP, Perl, the GNU C Library, OpenBSD, FreeBSD, NetBSD, Oracle9i, RealOne, RealPlayer, CVSup, gaim, GNU libtool, and mailman.

Lotus Trouble (Linux DevCenter)
Noel Davis looks at problems in Lotus Notes for Linux, tcpdump, mod_perl, kdepim, honeyd, NetWorker, NetPBM, jabber, mc, and Mambo Open Source.

Linux Kernel Trouble (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, Ethereal, Tethereal, INN, mpg321, vbox3, isakmpd, nd, phpGroupWare, and enq.

Apache Regex Problems (Linux DevCenter)
Noel Davis looks at problems in Apache, mod_php, XDM, Goahead Web Server, Xerox Document Center, SARA, phpBB2, OpenBB, SquirrelMail, and pServ.

Linux Kernel Problems (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, rsync, cdwrite, 4inarow, CVS, Ebola, net-snmp, lftp, and irssi.

BIND DoS Attack (Linux DevCenter)
Noel Davis looks at a denial-of-service attack against BIND and problems in KDE, GnuPG, screen, Ethereal, FreeRadius, mod_gzip, Pan, detecttr, OpenCA, EPIC, and libnids.

Trouble with glibc (Linux DevCenter)
Noel Davis looks at problems in the standard C library libc and in xinetd, hylafax, pServ, UnAce, Quagga, Zebra, terminatorX, and omega-rpg.

New Apache (Linux DevCenter)
Noel Davis looks at a new release of Apache, and problems in fileutils, coreutil, anonftp, Kpopup, CUPS, Libnids, PostgreSQL, thttpd, mod_security, and the Linux Java Installer.

OpenOffice Irritation (Linux DevCenter)
Noel Davis looks at problems in OpenOffice, slocate, fetchmail, GDM, Tomcat, ircd, HPUX's dtprintinfo, and Openserver's Xsco.

Problems Aplenty (Linux DevCenter)
Noel Davis looks at problems in XFree86, Stunnel, Exim, wu-ftpd, pam_smb, gdm2, pam_ldap, whois, the atari800 emulator, Horde, MPlayer, and Node.

Denial-of-Service Attacks (Linux DevCenter)
Noel Davis looks at denial-of-service attacks against Apache, OpenSSL, and FreeBSD, and problems in Perl, lsh, Teapop, ProFTPD, TclHttpd, MPlayer, Node, mpg123, and Freesweep.

Sendmail Trouble (Linux DevCenter)
Noel Davis looks at problems in Sendmail OpenSSH, Pine, saned, MySQL, gtkhtml, and Solstice AdminSuite.

GNOME trouble (Linux DevCenter)
Noel Davis looks at problems in BitKeeper, the GNOME Display Manager, rcpd, ViRobot Linux Server, OpenSLP, eMule, lMule, xMule, netris, and autorespond.

Postfix Attack (Linux DevCenter)
Noel Davis looks at problems in Postfix, DB2, stunnel, OpenSSH, up2date, eroaster, wget, xfstt, xpcd, pam-pgsql, xtokkaetama, and Half-Life.

Kernel Problems (Linux DevCenter)
Noel Davis looks at problems in Linux 2.4 kernels, Apache, VMware, BRU, Oracle, fdclone, simi, wimi, phpMyAdmin, nfs-utils, mpg123, and phpGroupWare.

Unzipping Problems (Linux DevCenter)
Noel Davis looks at problems in PHP, OpenLDAP, Xpdf, Adobe Acrobat Reader, Mozart, liece, OpenBSD's Packet Filter, unzip, Imagemagick, Ezbounce, semi, and wemi.

Summer GNATS Trouble (Linux DevCenter)
Noel Davis looks at problems in OpenSSH, radiusd-cistron, Ethereal, ypserv, lbreakout, GNATS, frox, poster, eldav, and PerlEdit.

More Kernel Trouble (Linux DevCenter)
Noel Davis looks at problems in Linux kernels, GNU Zip, xaos, Speak Freely, eterm, Hangul Terminal, typespeed, mikmod, kon2, zblast/xzb, and zenTrack.

Apache Vulnerabilities (Linux DevCenter)
Noel Davis looks at vulnerabilities to denial-of-service attacks with Apache web server and with CUPS; buffer overflows in PHP, glibc, and gps; and problems with ghostscript, Apache Portable Runtime (APR), mod_gzip, Batalla Naval, and Xmame.

Adventures with Kerberos, CVS, and GSS-API (Linux DevCenter)
One of the difficulties of writing about technology is exploring the dark corners where no one's ever been before. Jennifer Vesperman, author of the upcoming Essential CVS, recently tried to make her CVS installation use Kerberos authentication. She describes how she went about integrating the two in this article.

Linux Kernel Problems (Linux DevCenter)
Noel Davis looks at problems in Linux 2.4 kernels, sendmail, IMAP clients, cdrecord, lv, GNU Privacy Guard, EnGarde Secure Linux's sudo, SCO OpenLinux's mgetty and faxspool directory, BEA WebLogic Server, Unreal Engine, and WebLogic Express.

Monkey Trouble (Linux DevCenter)
Noel Davis looks at problems in Portable OpenSSH, Portable OpenSSH under AIX, ATM on Linux, Qpopper's poppassd, Monkey HTTPd, Red Hat's mod_auth_any, pptpd, EPIC4, HPUX's rexec, and vulnerabilities in Cisco equipment.

Snort Problems (Linux DevCenter)
Noel Davis looks at buffer overflows in Snort and SheerDNS, and problems in Xinetdvixie-cron, Oracle E-Business Suite FNDFS, xfsdump, Ximian Evolution, GtkHTML, kdegraphics, and psbanner.

Apache Security Update (Linux DevCenter)
Noel Davis looks at a security update to Apache; a major problem in sendmail; buffer overflows in Balsa, libsmtp, passlogd, lpr-ppd, and Solaris' dtsession; and problems in NetPBM, Eye of GNOME, the Progress database, and Red Hat Linux 9's vsftpd daemon.

Linux Kernel Root Hole (Linux DevCenter)
Noel Davis looks at a root hole in the Linux kernel; buffer overflows in Samba, qpopper, ircii, Mutt, DeleGate, SuSE's lprold, and Ethereal; and problems in OpenSSL, MySQL, man, tcpdump, and Red Hat's rxvt.

Buffer Overflows in sendmail (Linux DevCenter)
Noel Davis looks at buffer overflows in sendmail; Snort; the gzprintf() function supplied with the zlib library; and the lprm utility under OpenBSD, as well as problems in BIND; file; tcpdump; terminal emulators; Internet Message; and Messaging in the Emacs World.

OpenSSL Timing Attack (Linux DevCenter)
Noel Davis looks at problems in OpenSSL, Oracle, mod_php, MySQL, pam_xauth, VNC, apcupsd, nethack, Rogue, and BitchX.

Linux Kernel Problems (Linux DevCenter)
Noel Davis looks at problems in the Linux kernel, Kerberos, dchp3, the Blade encoder, WebSphere Advanced Server, SpamAssasin, OpenBSD's chpass, Red Hat Linux 8.0's kernel-utils package, w3m, Window Maker, and HPUX's wall.

CVS Problems (Linux DevCenter)
Noel Davis looks at problems in Concurrent Versions System (CVS), DHCP, slocate, Vim, Linux printer drivers, susehelp, fnord, mpg123, Astaro Security Linux firewall, and phpLinks.

CUPS Vulnerabilities (Linux DevCenter)
Noel Davis looks at buffer overflows in libmcrypt, HSphere Webshell, HTTP Fetcher Library, LCDproc, and UnixWare and Open UNIX's ps; and problems in the Common Unix Printing System, BitKeeper, FreeBSD's fpathconf(), S-PLUS, dhcpcd, leafnode, and Middleman.

Buffer Overflows in SSH and PHP (Linux DevCenter)
Noel Davis looks at buffer overflows in SSH, PHP, typespeed, Cyrus IMAP Server, Cyrus SASL library, and pdftops; and problems with PFinger, KDE, and zkfingerd.

MySQL Vulnerabilities (Linux DevCenter)
Noel Davis looks at a problem with Perl's safe mode; some serious vulnerabilities in MySQL; buffer overflows in wget, tcpdump, Canna, and GTetrinet; and problems in lynx, mICQ, Sun Cobalt RaQ 4 Server Appliances, xdvi, dvips, and Exim.

Samba Vulnerabilities (Linux DevCenter)
Noel Davis looks at problems in Samba, Pine, FreeS/WAN, Solaris priocntl(), Traceroute NANOG, kon2, libcgi-tucbr, Python, pServ, and Alcatel OmniSwitch switches.

BIND Issues (Linux DevCenter)
Noel Davis looks at a large set of problems in BIND; buffer overflows in KDE's LISA, libpng, masqmail, FreeBSD resolver code, Windowmaker, Tiny HTTPd, and Zeroo HTTP Server; and problems in Lib HTTPd, KDE's telnet and rlogin KIO code, Kgpg, Squid, and UnixWare and OpenUnix's talkd.

Abuse Attack (Linux DevCenter)
Noel Davis looks at buffer overflows in Abuse, log2mail, kadmind, Heimdal, ypserv, and trek; and problems in PHP-Nuke, lprng, pam_ldap, uudecode, and bzip2.

Denial-of-Service Vulnerabilities (Linux DevCenter)
Noel Davis looks at denial-of-service vulnerabilities in xinetd, syslog-ng, net-snmp, and Sun's lockd; problems with heartbeat, dvips, OpenOffice, and Cisco CatOS embedded HTTP server; and security vulnerabilities in kpf, gnome-gv, ggv, Mozilla, and PAM.

Apache Vulnerabilities (Linux DevCenter)
Noel Davis looks at buffer overflows in Apache, fetchmail, Heimdal, logsurfer, ghostview, kghostview, and WN Server; and problems in unzip, tar, gv, SMRSH, and rogue.

Slapper Worm (Linux DevCenter)
Noel Davis looks at the Linux Slapper worm; a large set of vulnerabilities in NetBSD; and problems in libX11.so, OS X's nidump, DB4Web, joe, BRU Workstation, xbreaky, and Tru64/OSF1 version 3.x.

PHP Injection Attack (Linux DevCenter)
Noel Davis looks at an injection attack against PHP; several problems in KDE and Konqueror; buffer overflows in gain, kadmin, multiple applications in Tru64, and Ethereal; and problems in cacti, mhonarc, wordtrans, scrollkeeper, and the Cisco VPN Client.

Bugzilla Security Problems (Linux DevCenter)
Noel Davis looks at buffer overflows in PostgreSQL, and UnixWare and Open UNIX's ndcfg; and problems in PHP, scponly, the kernel supplied with Red Hat Linux 7.3, Bugzilla, EPIC Script Light, UnixWare DNS Resolver, Mantis, an exploit for the Cisco IOS TFTP Server bug, and Red Hat's tcl/tk and expect.

C Call Vulnerabilities (Linux DevCenter)
Noel Davis looks at buffer overflows in calloc(), Sun's ONE/iPlanet Web Server, dietlibc, OpenAFS, Kerberos 5 Administration System, and PNG libraries; and problems in FreeBSD's Berkeley Fast File System, CVS, iSCSI, Red Hat Secure Web Server, tinyproxy, and IRIX named.

Promiscuous Mode Problems (Linux DevCenter)
Noel Davis looks at a vulnerability in PHP; buffer overflows in Cisco IOS, Fake Identd, HylaFAX, and EnGarde Secure Linux's resolver libraries; and problems in the reporting of Promiscuous Mode by the Linux kernel, Sun Fire servers, chfn, chsh, Pine, GNU Mailman, and the VNC challenge and response.

Squid Trouble (Linux DevCenter)
Noel Davis looks at buffer overflows in Squid, mod-ssl, the Solaris Volume Manager, ATPhttpd, iPlanet, and kcms_configure; and problems in the CDE ToolTalk Database Server, the Linux kernel, nn, Icecast, NcFTP, and Sharp's Zaurus handheld computer.

Securing Small Networks With OpenBSD, Part 3 (BSD DevCenter)
In the third installment of our series on OpenBSD networking, Jacek Artymiak examines pf rules and potential sendmail problems.

Buffer Overflows in PHP Forms and mod_ssl (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports buffer overflow problems in PHP forms and mod_ssl, as well as security holes in Oracle 8 and 9 systems, User Mode Linux, and the webtop application of Caldera's Open UNIX and UnixWare systems.

Scanning for Rootkits (Linux DevCenter)
When a hacker gets access to your system, he will leave himself an easy way back in, called a rootkit. Oktay Altunergil shows us how to detect rootkits and remove them.

Vulnerability in login (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports on a vulnerability that lets remote attackers access root through login, a problem in JRun Java app server software that exposes souce code of JavaServer pages, and a glitch in the script utility that lets users overwrite arbitrary files.

Understanding Rootkits (Linux DevCenter)
Hackers have many tools that allow them to remain undetected during an attack. Understanding these tools is key to recognizing and cleaning up after an attack.

IPsec Tunneling Between FreeBSD Hosts (BSD DevCenter)
IPSec encrypts data at the IP packet level, so insecure applications can be encrypted while travelling over the Internet. Mike DeGraw-Bertsch shows us how to set it up.

New Vulnerability in OpenSSH (Linux DevCenter)
A new vulnerability in OpenSSH can be exploited by a local attacker to execute arbitrary code with the permissions of the root user. Noel Davis also covers problems in OpenBSD, wmtv, Auto Nice Daemon, NetDynamics, Xitami Web server, libgtop_daemon, xtel, Lotus Domino, OpenServer's setcontext and sysi86, SuSE's Postfix installation, and fml.

Buffer Overflow in WU FTP daemon (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports on a buffer overflow in a popular FTP daemon, as well as problems with procmail, Hypermail, and Red Hat and BSDI's UUCP applications.

A New Version of OpenSSH (Linux DevCenter)
A new release of OpenSSH fixes a variety of bugs, including a security vulnerability, while Red Hat's Stronghold has a vulnerability that can be used to disclose sensitive system files. Details on these and more in this week's Security Alerts.

SSH Buffer Overflow (Linux DevCenter)
The big news this week is that the SSH Communications Security recommends that users stop using the SSH1 protocol and replace it with SSH2. Users of OpenSSH should upgrade to version 2.3.0 as soon as possible. Learn more about the SSH buffer overflow problem, plus other alerts, in this column.

A DoS Attack via Tux (Linux DevCenter)
In this week's Security Alerts, Noel Davis highlights a DoS attack on Tux, the Web server in the Linux kernel, and other vulnerabilities in open source software, Novell, Cisco, and Mac OS 10.1.

Time and Tide Wait for No Protocol (Linux DevCenter)
An analysis of the SSH Keystroke Timing Attack, by Richard Silverman, author of SSH, The Secure Shell: The Definitive Guide.

Linux syncookies Vulnerability and an scp/sftp bug (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports on a vulnerability in the cookie used by netfilter, a weakness that allows an attacker to access the Web admin template in Lotus Domino, and a bug in some versions of scp and sftp.

Linux Buffer Overflows and an old SSH Daemon (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports on a bug in the Linux kernel that can allow files that exceed a user's quota limits; an old daemon hanging around in SSH 2; and vulnerabilities in Red Hat's printing system.

A Root Exploit and DoS in the Linux Kernel (Linux DevCenter)
In this week's Security Alerts, Noel Davis looks at a root exploit and a denial-of-service attack in the Linux kernel; buffer overflows in Snes9x and Oracle 9i Web Cache; and problems in PAM's login, Squid, Apache, Mac OS X, W3Mail, sdiff, and looking-glasses.

Firing up Firewalls (ONLamp.com)
A firewall is an important weapon in your defense against hackers. Chris Coleman helps you get started with all the tools needed to install a firewall.

A Sysadmin's Security Basics (Linux DevCenter)
A checklist of network security items includes user passwords, email client settings, firewalls, a DMZ, SSH and a list of tools to check your network.

Vulnerabilities in Lotus Domino, Zope, and Cisco Secure PIX Firewall (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports on vulnerabilities in Zope, Mandrake and Caldera uucp packages, PHP Nuke, Lotus Domino, and more.

Vulnerabilities in sendmail, speechd, and OpenServer vi (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports problems in sendmail, Solaris Yellow Pages, CDE ToolTalk, speechd, FreeBSD login, OpenServer vi, Hushmail's Web-based email server, and FreeBSD's OpenSSH.

PAM Modules (Linux DevCenter)
While most Pluggable Authentication Modules are designed for authentication, programmers have written ones to handle a host of other issues. Jennifer Vesperman introduces to some of the more useful modules available.

OpenSSH Problems (Linux DevCenter)
In this week's Security Alerts, Noel Davis reports that sftp is the weakest link in OpenSSH. Find out what to do about it and problems with Websphere, Red Hat setserial, and Apache running on OS X.

Introduction to PAM (Linux DevCenter)
Pluggable Authentication Modules provide a solution to the difficulties of user authentication. Jennifer Vesperman introduces PAM and helps you get started.

Buffer Overflows in uidadmin (Linux DevCenter)
In Security Alerts for Sept. 24, 2001, Noel Davis warns about buffer overflows in Open Unix and UnixWare's uidadmin, an exploit in glFTPD, a vulnerability in the Web-based email system Basilix, and more.

Linux Virus Reported (Linux DevCenter)
In this week's Security Alerts, Noel Davis warns about a Remote Shell Trojan Linux-based virus, buffer overflows in fetchmail, and problems in the BSD Line Printer Daemon.

Buffer Overflow in OpenServer's Mana (Linux DevCenter)
This week Noel Davis warns about a buffer overflow in OpenServer's mana; symbolic link race conditions in Solaris' patchadd and the Netscape 6.01a installation scripts; and problems in ProFTPd, Conectiva Linux's tcltk, NetBSD's dump, mailman, mod_auth_mysql, Directory Manager, Taylor UUCP, screen, PHProjekt, and Red Hat's lpd.

Buffer overflows in OpenUnix 8 utilities and the Solaris printer daemon (Linux DevCenter)
In this week's Security Alerts, Noel Davis looks at buffer overflows in OpenUnix 8 utilities, vulnerabilities in the Macromedia ColdFusion server and other weak links in your system.

More Telnet Daemon Vulnerabilities (Linux DevCenter)
Noel Davis shows us buffer overflows in Linux telnet daemons, IBM AIX telnet daemons, the Kerberos 5 telnet daemon, Window Maker, and Solaris' xlock; temporary-file race conditions in AllCommerce and rcs2log; and vulnerabilities in ZyXEL Prestige 642R and 642R-I ADSL routers, groff, OpenLDAP, fetchmail, UnixWare Package Tools, docview, and ColdFusion Server 5.

Security Alerts: Linux IP Masquerading (Linux DevCenter)
Noel Davis shows us buffer overflows in xloadimage, ucd-snmp, Oracle dbsnmp, and xmcd's cda; and vulnerabilities in phpMyAdmin, wvdial, Slackware's man, Linux IP masquerading, and Slackware's locate.

Linux Kernel Bug (Linux DevCenter)
Noel Davis shows us a bug in Linux Kernels newer than 2.4.3; a buffer overflow in Solaris' dtmail; vulnerabilities in CylantSecure, PHPLib, top, Apache, tar, Firewall-1, Arkeia backup software, and IRIX's netprint; and talks about the configuration of Cayman DSL routers.

Security Alerts: Remote Root Exploit in Telnet Daemon (Linux DevCenter)
Noel Davis shows us a root exploit in BSD derived telnet daemons; buffer overflows in xman, the Merrit and Lucent RADIUS servers, ypbind, the AIX libi18n Library, and tcpdump; temporary-file race conditions in lmail and tripwire; and vulnerabilities in SSH Secure Shell 3.0.0, Lotus Domino Server, IMP, SSLeay/OpenSSL, and squid.

Security Alerts: sudo root exploit (Linux DevCenter)
Noel Davis shows us buffer overflows in sudo, SuSE's dip, Scotty's ntping, and UnixWare's statd; a flaw in FreeBSD's rfork(); two vulnerabilities in Check Point's VPN-1/FireWall-1 firewall products; a new version of the rpm package manager; two vulnerabilities in Macromedia's ColdFusion Server; a minor Apache bug; a brute-force attack against SuSE's AXP Alpha xdm utility; and more on the cfingerd remote vulnerability.

Tools of the Trade: Part 3 (Linux DevCenter)
A look at syslog and snort as security protection in this third article of our "Tools of the Trade" series.

Professional Paranoia: Secrets of Security Experts (ONLamp.com)
Michael Lucas tackles the question "How do I become a security professional?" and gives practical advice on how to be more security-conscious.

Security Alerts: PHP Weaknesses? (Linux DevCenter)
Noel Davis shows us a correction to the report on the AIX rsh buffer overflow; buffer overflows in Solaris' whodo, and UnixWare's su, uucp, and crontab packages, and xvt; temporary file symbolic link race condition vulnerabilities in Red Hat's LPRng, and Red Hat's crontab; problems in Poprelayd, PHP Safe mode, ePerl, 802.11b Access Points, Gnatsweb, SquirrelMail, and phpMyAdmin; and a paper on common PHP vulnerabilities.

SAMBA Remote Root Exploit (Linux DevCenter)
Noel Davis shows us buffer overflows in the GazTek HTTP Daemon, Solaris Printer Daemon, and w3m; a problem in default SAMBA installations that can be used to gain root access; and problems in Cisco 6400 NRP2, udirectory, Tarantella, Oracle 8i SQLNet, Formmail.pl, OS X directory permissions, and kdesu.

AIX Remote Root Exploit (Linux DevCenter)
Noel Davis shows us buffer overflows in AIX's rsh, the curses library, Red Hat Linux's XFree86 packages, xinetd, MDBMS, BestCrypt, and cfingerd; format-string vulnerabilities in Kaspersky AntiVirus, eXtremail, and the Solaris at command; a symbolic-link race condition in KTVision; and problems in pmpost, AIX's diagrpt, and iptables.

Tools of the Trade: Part 1 (Linux DevCenter)
In this first of a three-part series, Carl Constantine covers tools and techniques that system administrators can use to protect their networks, including discussion of nmap, Ethereal, and how to set up honey pots.

IPFW Logging (BSD DevCenter)
Firewalls can potentially block huge amounts of traffic. Dru Lavigne shows us how to fine-tune our firewall logs to reveal the traffic that concerns us most.

Remote Root Exploit in QPopper (Linux DevCenter)
Noel Davis shows us buffer overflows in the Solaris mail utility, Qpopper, and TIAtunnel; temporary-file race conditions in Imp, kmmodreg, and ispell; format-string vulnerabilities in GnuPG and exim; denial-of-service attacks against NetBSD and Fpf; and problems in OpenSSH, the Cisco Content Service Switch, and BestCrypt.

Proper Paranoia: Educating Your Co-Workers (ONLamp.com)
Michael Lucas runs a new security trainee through the gauntlet of patching live servers. He also shows how to instill a healthy attitude toward network security in those you work with by teaching them to be properly paranoid.

Apache.org Server Compromised (Linux DevCenter)
Noel Davis shows us the compromise of the Apache Software Foundation Server; buffer overflows in yppasswd, Qpopper, and mailtool; vulnerabilities in TWIG, webmin, and GnuPG; a new type of attack against sendmail; and discuss the use of the user nobody.

Carnivore: A System Admin's Concerns (Linux DevCenter)
The packet-sniffing Carnivore box gives the FBI the ability to nab and read a suspect's e-mail and web page requests. But those are abilities every sysadmin already has, so why are we so upset?

Cheese Worm Plugs Hole Left by Lion Worm (Linux DevCenter)
Noel Davis shows us buffer overflows in man, DQS, Netscape Enterprise Web Publisher, and IRIX Embedded Support Partner; a temporary-file race condition in the ARCservIT Unix Client; problems in Zope, Cisco Content Service Switch, CUPS, i386 syscalls in Solaris x86, and the Logitech Wireless Desktop; and talks about Cheese the "friendly" worm.

Solaris Worm Attacks IIS Servers (Linux DevCenter)
Noel Davis shows us problems in vixie cron, Oracle ADI, EnGarde Secure Linux, and Samba 2.0.8; discuss the sadmind/IIS worm; and how to protect your system against worms and other attackers.

BSD Firewalls: IPFW Rulesets (BSD DevCenter)
Dru Lavigne explains how to create IPFW firewall rules.

Predictable Initial Sequence Numbers (Linux DevCenter)
Noel Davis shows us predictable initial sequence number attacks; a format string vulnerability in minicom; a buffer overflow in mailx; a new version of GnuPG; and problems in SAP R/3 demo, Bugzilla, and Red Hat Linux 7.1's mount package

Looking at the lpdw0rm Worm (Linux DevCenter)
Noel Davis shows us the lpdw0rm worm; an updated version of OpenSSL; buffer overflows in MIT Kerberos 5's FTP Daemon, and Mercury for NetWare's POP3 Daemon; a string format vulnerability in gftp; a symbolic link race condition in nedit's backup files; a temporary file race condition in rpmdrake; and problems in phpMyAdmin, Debian's zope packages, and the Tektronix PhaserLink 850's Web Server.

BSD Firewalls: IPFW (BSD DevCenter)
Building a firewall? Dru Lavigne gets you started with an IPFW firewall on FreeBSD.

BSD Firewalls: IPFW (BSD DevCenter)
Building a firewall? Dru Lavigne gets you started with an IPFW firewall on FreeBSD.

Sudo Contains Root Exploit (Linux DevCenter)
Noel Davis shows us buffer overflows in sudo, innfeed, and Cyberscheduler; symbolic link race conditions in Samba, VMware, exuberant-ctags, and nedit; and problems in Red Hat FTP iptables, mgetty, DCForum, Cyberscheduler, and sendfiled.

Scanning Your Network (BSD DevCenter)
Dru Lavigne shows us how to use nmap, a port scanning utility, to secure Unix servers and workstations.

FTP Buffer Overflows (Linux DevCenter)
Noel Davis shows us buffer overflows in FTP daemons, Oracle Application Server, Solaris ipcs, Solaris Xsun, and SCO OpenServers; temporary-file race conditions in pine and pico; format string bugs in HylaFAX and cfingerd; a bug that causes Netscape to execute JavaScript placed in a GIF comment; and problems in Midnight Commander, mkpasswd, Alcatel ADSL-Ethernet Bridges, and Interscan VirusWall.

A New Worm Targets Linux (Linux DevCenter)
Noel Davis shows us the Linux based Adore Worm; buffer overflows in xntpd and ntpd; and vulnerabilities in SharePlex, Ultimate Bulletin Board, Lucent/ORiNOCO Closed Network, Red Hat's OpenSSH, Cisco Content Services Switches, and IPFilter.

Lion Worm Continues Rampage (Linux DevCenter)
Noel Davis shows us the Lion worm; a race condition in the Linux kernel; buffer overflows in several SCO Unix utilities; a new version of MySQL that fixes a major security problem; vulnerabilities in some Cisco routers, switches, and concentrators; and problems with Raptor Firewall, CrazyWWWBoard, Solaris tip, and Pitbull LX.

Beyond Firewalls (Linux DevCenter)
Now that you have your firewall up and running, you're all set, right? Well, not exactly. Carl Constantine explains how to plug some of the common security holes beyond the firewall.

MySQL File Overwrite Vulnerability (Linux DevCenter)
Noel Davis shows us a buffer overflow in ASPSeek; a denial of service attack against timed; a new version of OpenSSH with many improvements; an attack against the private keys used by GnuPG; a race condition in the UFS and EXT2FS file systems; and problems with MySQL, VIM, FCheck, Solaris perfmon, Interchange, and Compaq's management software.

Apache Insecurity Reveals Directory Contents (Linux DevCenter)
Noel Davis discusses buffer overflows and format string vulnerabilities in icecast, Half-Life Dedicated Server, Solaris SNMP, ipop2d, ipop3d, imapd, mutt, and cfengine; temporary-file problems in the SGML-Tools package and Mesa; and problems with Apache, several FTP daemons, a Solaris SNMP agent, vBulletin, FTPFS, and Ikonboard.

Multi-Homed Server Vulnerabilities (Linux DevCenter)
This week: Buffer overflows in ircd, ePerl, MIT Kerberos 4 and 5, ascdc, and slrn; temporary file problems in MIT Kerberos 4 and 5, the GNU C Library, and Athena widgets; problems with proftpd under Debian, Midnight Commander, Cisco Aironet 340 Bridges, and man2html; and loopback devices and multi-homed routing.

Is Your Router Insecure? (Linux DevCenter)
Noel Davis shows us a problem in Cisco IOS that can be used to predict TCP sequence numbers in routers; problems in PHP-Nuke, Chili!Soft ASP, Nortel Networks Connectivity Extranet Switches, Joe, Veritas Cluster Server, and fcron; and a buffer overflow in mailx.

Java JDE Allows Unauthorized Commands (Linux DevCenter)
Noel Davis shows us a problem in Java that allows Java code to execute unauthorized commands; buffer overflows in CUPS and sudo; temporary file problems with StarOffice, MicroFocus COBOL, and CUPS; and vulnerabilities in pgp4pine, the Solaris LDAP PAM module, adcycle, and Zope.

MySQL Buffer Overflow; Secure PHP Coding (Linux DevCenter)
Noel Davis shows us buffer overflows in MySQL, analog, vixie cron, and Kerberos IV; problems with kicq, licq, and kaim; root exploits in NetBSD i386 kernels; and insecure coding with PHP and MySQL.

Linux Kernel Problems; SSH Design Flaw (Linux DevCenter)
Noel Davis shows us a system-call problem and a race condition in Linux; buffer-overflow problems in SSH-1 and XMail; DOS attack vulnerabilities in BIND 9.0.1 and ProFTPD; string format problems in man; design flaws in wireless networking security code; and temporary file problems in FreeBSD's sort.

Buffer-Overflow Problems in BIND (Linux DevCenter)
Buffer-overflow bugs are discovered in BIND, gnuserv, tinyProxy, and INN; developers report issues with ntop and LPRng.

New Security Problems and a Warning About Checking User Input (Linux DevCenter)
Noel Davis summarizes new security issues including buffer overflows in splitvt, bing, write, and Lotus Domino's SMTP server; temporary file problems with webmin and Apache's mod_rewrite; format string problems with icecast; ip firewalling problems with FreeBSD; and SQL problems in Postaci.

Cracking Passwords to Enhance Security (BSD DevCenter)
Dru Lavigne shows us how to crack passwords and explains how it can help enhance system security.

Ramen Worm Attacks Red Hat Linux Machines (Linux DevCenter)
An Internet worm that attacks Red Hat Linux machines has cracked hundreds of machines. Noel Davis describes this and other security problems brought to light this week.

Insecure Temporary File Functions (Linux DevCenter)
Noel Davis reports on the latest security problems and news, including the Immunix OS security audit, issues with GNU C library, ReiserFS, linuxconf and more.

IBM Websphere, Shockwave Flash, and emacs Advisories (Linux DevCenter)
Problems this week include minor problems with sendmail, exposure problems with Lotus Domino, problems in the default setup of Informix Webdriver and IBM Websphere Commerce Suite, a buffer overflow in Shockwave Flash, denial of service attacks against login, privacy problems in emacs, symlink attack in exmh, and a potential exploit against GTK+.

PalmOS, Half-Life Server, and Ethereal Vulnerabilities (Linux DevCenter)
Problems this week include more symlink problems with catman and dialog, buffer overflows in oops, halflifeserver, and ethereal, key problems with gnupg, problems with PalmOS devices, and a prime example of amazing vulnerabilities in third-party software packages.

Security Alerts: SAMBA, pine, ircd, and More (Linux DevCenter)
Noel Davis summarizes recent open source and Unix security-related advisories. Problems this week include symlink problems with joe, pico, and samba, a buffer overflow in bftpd, and problems with pine.

Security Alerts: KTH Kerberos, Red Hat PAM, and More (Linux DevCenter)
Noel Davis summarizes open source and Unix exploits. Problems this week include local and remote root exploits in KTH Kerberos, buffer overflows in Red Hat's PAM, a discussion of security problems with web-based applications, and an example of one of these security problems in phpGroupWare.

Commercial Python IDEs (Python DevCenter)
Python developers looking for a commercial IDE now have a choice, PythonWorks 1.1 or WingIDE.

Security Alerts: Twig, Midnight Commander, and More (Linux DevCenter)
Noel Davis summarizes published open source and Unix exploits. Problems this week include arbitrary code execution in Twig, new symlink attacks, a hidden control code attack on Midnight Commander, and a LANGUAGE attack on glibc.

Security Alerts: Koules Local Root Exploit And More. (Linux DevCenter)
This week's exploits include a local root compromise in Koules 1.4, a buffer overflow in modutilities, and various problems with Alladin Ghostscript.

Security Alerts: Vixie cron Exploit and More (Linux DevCenter)
This week's column includes exploits reported for Vixie cron, OpenSSH, tcsh, and more.

Security Alerts: OpenBSD Non-exploit and More (Linux DevCenter)
Noel Davis reviews the published exploits from Unix and open source. This week's Insecurities column includes a satirical non-exploit against OpenBSD

Open RSA: The Patent Expires (Linux DevCenter)
RSA Security released its rights to license the patent on the RSA encryption algorithm, just weeks before it was due to expire. What is RSA, and what does its patent expiration mean?

Is Carnivore Eating You? (Linux DevCenter)
The FBI wants to install black boxes at ISPs to monitor email traffic of suspects. What are civil libertarians doing to try to stop it?With audio

Securing Your Home Network With the Edge Firewall (Linux DevCenter)
Should you consider setting up a home firewall, and if so, what are the pros and cons? Carl Constantine describes his adventures into home network security.

CYA for System Administrators (Linux DevCenter)
Some things to keep in mind when testing your network's security, given today's litigious society.

The Week in Linux News (Linux DevCenter)
More security, starters for newbies, app development, and interviews with Torvalds, Alan Cox, and Linsight's David Whitinger.

The Week in Linux News (Linux DevCenter)
New tutorials and reports on security, PHP, Apache and Perl.

The Week in Linux News (Linux DevCenter)
Network and security resources, new releases, and developer resources.

Preventing Distributed Denial of Service Attacks (Linux DevCenter)
Six ways to avoid becoming an unwilling collaborator.

Linux Tools For Network Analysis (Linux DevCenter)
Spector finds two tools for watching traffic: Ethereal and Netwatch.

The Week in Linux News (Linux DevCenter)
Red Hat's big deals, links to security articles, and new releases.


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Get Acquainted with Linux Security and Optimization System
An essential guide for network administrators, Mourani provides guidance on installing a Red Hat Linux server that is configured for a high level of security and performance. He offers useful advice on a custom installation, including which packages are unnecessary. It includes sections on backups, firewall security, Sendmail configuration and covers setup of many other technologies including Samba and Squid. This document is only available in PDF. [Source: Linux Powered]


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