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Slackware 13.0: Critical Kernel Crash Risk from Oversized IP Packets

New Linux kernel packages are available for Slackware 13.0 and -current to address a security issue. A kernel bug discovered by David Ford may allow remote attackers to crash the kernel by sending an oversized IP packet. While the impact on ordinary servers is still unclear (the . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [slackware-security] kernel (SSA:2009-342-01) New Linux kernel packages are available for Slackware 13.0 and -current to address a security issue. A kernel bug discovered by David Ford may allow remote attackers to crash the kernel by sending an oversized IP packet. While the impact on ordinary servers is still unclear (the problem was noticed while running openvasd), we are issuing these kernel packages as a preemptive measure. For more information, see: https://www.cve.org/CVERecord?id=CVE-2009-1298 https://lkml.org/lkml/2009/11/25/104 Here are the details from the Slackware 13.0 ChangeLog: +--------------------------+ Tue Dec 8 20:44:44 UTC 2009 patches/packages/linux-2.6.29.6-3/: Added new kernels and kernel packages with a patch for CVE-2009-1298, a kernel bug where oversized IP packets cause a NULL pointer dereference and immediate hang. For more information, see: https://www.cve.org/CVERecord?id=CVE-2009-1298 https://lkml.org/lkml/2009/11/25/104 Be sure to reinstall LILO after upgrading the kernel packages. (* Security fix *) +--------------------------+ Where to find the new packages: +-----------------------------+ HINT: Getting slow download speeds from ftp.slackware.com? Give slackware.osuosl.org a try. This is another primary FTP site for Slackware that can be considerably faster than downloading directly from ftp.slackware.com. Thanks to the friendly folks at the OSU Open Source Lab (https://osuosl.org/) for donating additional FTP and rsync hosting to the Slackware project! :-) Also see the "Get Slack" section on http://www.slackware.com/ for additional mirror sites near you. Updated kernel packages for Slackware 13.0 may befound here: ftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/packages/linux-2.6.29.6-3/ Updated kernel packages for Slackware 13.0 x86_64 may be found here: ftp://ftp.slackware.com/pub/slackware/slackware64-13.0/patches/packages/linux-2.6.29.6-3/ Updated kernel packages for Slackware -current may be found here: Updated kernel packages for Slackware -current x86_64 may be found here: Signatures: +---------+ All packages are signed with the Slackware Security Team GPG signature for verification of authenticity. File may also be checked with the CHECKSUMS.md5 file provided in each Slackware directory tree, which is also signed with the Slackware GPG key. Kernel patch for Linux 2.6.29.x or newer: +---------------------------------------------+ A kernel patch for CVE-2009-1298 that should apply cleanly to most 2.6.29.x or newer kernels may be found here: ftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/source/linux-2.6.29.6-3/linux-2.6.29.6-03-ip_fragment-CVE-2009-1298.diff.gz Installation instructions: +------------------------+ Upgrade the kernel packages as root and reinstall LILO. If you are building your own kernel from unfixed vanilla sources, the patch(es) appropriate for your kernel may be applied to the source like this: cd /usr/src/linux zcat linux-2.6.29.6-03-ip_fragment-CVE-2009-1298.diff.gz | patch -p1 --verbose Note that the previous security patches should also be applied if using unfixed 2.6.29.6 sources. Those are also available in the same directory on the FTP server. +-----+ . Critical kernel flaw identified in Slackware 13.0 and -current facilitates crashes through oversized UDP packets. Urgent patches released.. Kernel Packages, Slackware Security, Remote Threats, Security Update. . Severity: Critical. LinuxSecurity.com Team

Dec 08, 2009 •Critical Slackware