+---------------------------------------------------------------------+ | LinuxSecurity.com Weekly Newsletter | | June 2nd, 2006 Volume 7, Number 23n | | | | Editorial Team: Dave Wreski dave@xxxxxxxxxxxxxxxxx | | Benjamin D. Thomas ben@xxxxxxxxxxxxxxxxx | +---------------------------------------------------------------------+ Thank you for reading the LinuxSecurity.com weekly security newsletter. The purpose of this document is to provide our readers with a quick summary of each week's most relevant Linux security headlines. This week, advisories were released for awstats, lynx, tiff, mysql, dovecot, libextractor, kernel, motor, typespeed, netpbm, mpg123, dia, foomatic-filters, cron, and rug. The distributors include Debian, Mandriva, and SuSE. --- Security on your mind? Protect your home and business networks with the free, community version of EnGarde Secure Linux. Don't rely only on a firewall to protect your network, because firewalls can be bypassed. EnGarde Secure Linux is a security-focused Linux distribution made to protect your users and their data. The security experts at Guardian Digital fortify every download of EnGarde Secure Linux with eight essential types of open source packages. Then we configure those packages to provide maximum security for tasks such as serving dynamic websites, high availability mail, transport, network intrusion detection, and more. The result for you is high security, easy administration, and automatic updates. The Community edition of EnGarde Secure Linux is completely free and open source. Updates are also freely available when you register with the Guardian Digital Secure Network. http://www.engardelinux.org/modules/index/register.cgi --- EnGarde Secure Linux v3.0.6 Now Available Guardian Digital is pleased to announce the release of EnGarde Secure Community 3.0.6 (Version 3.0, Release 6). This release includes several bug fixes and feature enhancements to the Guardian Digital WebTool and the SELinux policy. This release also include several updated packages, and additional new packages available for installation. --- Security Compromise Underway? Spotting a security compromise under way can be a tense undertaking. How you react can have large consequences. If the compromise you are seeing is a physical one, odds are you have spotted someone who has broken into your home, office or lab. You should notify your local authorities. In a lab, you might have spotted someone trying to open a case or reboot a machine. Depending on your authority and procedures, you might ask them to stop, or contact your local security people. If you have detected a local user trying to compromise your security, the first thing to do is confirm they are in fact who you think they are. Check the site they are logging in from. Is it the site they normally log in from? No? Then use a non-electronic means of getting in touch. For instance, call them on the phone or walk over to their office/house and talk to them. If they agree that they are on, you can ask them to explain what they were doing or tell them to cease doing it. If they are not on, and have no idea what you are talking about, odds are this incident requires further investigation. Look into such incidents , and have lots of information before making any accusations. If you have detected a network compromise, the first thing to do (if you are able) is to disconnect your network. If they are connected via modem, unplug the modem cable; if they are connected via Ethernet, unplug the Ethernet cable. This will prevent them from doing any further damage, and they will probably see it as a network problem rather than detection. If you are unable to disconnect the network (if you have a busy site, or you do not have physical control of your machines), the next best step is to use something like tcp_wrappers or ipfwadm to deny access from the intruder's site. If you can't deny all people from the same site as the intruder, locking the user's account will have to do. Note that locking an account is not an easy thing. You have to keep in mind .rhosts files, FTP access, and a host of possible backdoors. After you have done one of the above (disconnected the network, denied access from their site, and/or disabled their account), you need to kill all their user processes and log them off. You should monitor your site well for the next few minutes, as the attacker will try to get back in. Perhaps using a different account, and/or from a different network address. >From the Linux Security HowTo by Dave Wreski: http://www.linuxsecurity.com/docs/LDP/Security-HOWTO/ ---------------------- Linux File & Directory Permissions Mistakes One common mistake Linux administrators make is having file and directory permissions that are far too liberal and allow access beyond that which is needed for proper system operations. A full explanation of unix file permissions is beyond the scope of this article, so I'll assume you are familiar with the usage of such tools as chmod, chown, and chgrp. If you'd like a refresher, one is available right here on linuxsecurity.com. http://www.linuxsecurity.com/content/view/119415/49/ -------- --> Take advantage of the LinuxSecurity.com Quick Reference Card! --> http://www.linuxsecurity.com/docs/QuickRefCard.pdf +---------------------------------+ | Distribution: Debian | ----------------------------// +---------------------------------+ * Debian: New awstats packages fix arbitrary command execution 26th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122897 * Debian: New lynx packages fix denial of service 26th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122905 * Debian: New tiff packages fix denial of service 27th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122913 * Debian: New MySQL 4.0 packages fix several vulnerabilities 29th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122914 * Debian: New dovecot packages fix directory traversal 29th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122915 * Debian: New libextractor packages fix arbitrary code execution 29th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122916 * Debian: New Linux kernel 2.4.17 packages fix several vulnerabilities 29th, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122928 * Debian: New motor packages fix arbitrary code execution 31st, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122940 * Debian: New typespeed packages fix arbitrary code execution 31st, May, 2006 Niko Tyni discovered a buffer overflow in the processing of network data in typespeed, a game for testing and improving typing speed, which could lead to the execution of arbitrary code. http://www.linuxsecurity.com/content/view/122948 * Debian: New lynx-cur packages fix several vulnerabilities 1st, June, 2006 Updated package. http://www.linuxsecurity.com/content/view/122956 +---------------------------------+ | Distribution: Mandriva | ----------------------------// +---------------------------------+ * Mandriva: Updated netpbm packages fix crash issues with some converters 26th, May, 2006 The pnmtopalm program, part of netpbm, crashes on many images. The pnmtofits program, part of netpbm, crashes during conversion. Updated packages have been patched to correct these issues. http://www.linuxsecurity.com/content/view/122907 * Mandriva: Updated mpg123 packages fix DoS vulnerability. 26th, May, 2006 An unspecified vulnerability in mpg123 0.59r allows user-complicit attackers to trigger a segmentation fault and possibly have other impacts via a certain MP3 file, as demonstrated by mpg1DoS3. Packages have been patched to correct this issue. http://www.linuxsecurity.com/content/view/122912 * Mandriva: Updated dia packages fix string format vulnerabilities. 30th, May, 2006 A format string vulnerability in Dia allows user-complicit attackers to cause a denial of service (crash) and possibly execute srbitrary code by triggering errors or warnings, as demonstrated via format string specifiers in a .bmp filename. http://www.linuxsecurity.com/content/view/122936 +---------------------------------+ | Distribution: SuSE | ----------------------------// +---------------------------------+ * SuSE: foomatic-filters shellcode injection 30th, May, 2006 A bug in cupsomatic/foomatic-filters that allowed remote printer users to execute arbitrary commands with the UID of the printer daemon has been fixed (CVE-2004-0801). http://www.linuxsecurity.com/content/view/122932 * SuSE: cron local privilege escalation 31st, May, 2006 The code in do_command.c in Vixie cron does not check the return code of a setuid call, which might allow local users to gain root privileges if setuid fails in cases such as PAM failures or resource limits. http://www.linuxsecurity.com/content/view/122947 * SuSE: kernel (SUSE-SA:2006:028) 31st, May, 2006 Multiple vulnerabilities have been fixed in the linux kernel. http://www.linuxsecurity.com/content/view/122949 * SuSE: rug (SUSE-SA:2006:029) 31st, May, 2006 Updated package. http://www.linuxsecurity.com/content/view/122950 ------------------------------------------------------------------------ Distributed by: Guardian Digital, Inc. 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