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=========================================================== Ubuntu Security Notice USN-82-1 February 15, 2005 linux-source-2.6.8.1 vulnerabilities CAN-2005-0176, CAN-2005-0177, CAN-2005-0178 http://oss.sgi.com/archives/netdev/2005-01/msg01036.html =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) The following packages are affected: linux-image-2.6.8.1-5-386 linux-image-2.6.8.1-5-686 linux-image-2.6.8.1-5-686-smp linux-image-2.6.8.1-5-amd64-generic linux-image-2.6.8.1-5-amd64-k8 linux-image-2.6.8.1-5-amd64-k8-smp linux-image-2.6.8.1-5-amd64-xeon linux-image-2.6.8.1-5-k7 linux-image-2.6.8.1-5-k7-smp linux-image-2.6.8.1-5-power3 linux-image-2.6.8.1-5-power3-smp linux-image-2.6.8.1-5-power4 linux-image-2.6.8.1-5-power4-smp linux-image-2.6.8.1-5-powerpc linux-image-2.6.8.1-5-powerpc-smp linux-source-2.6.8.1 The problem can be corrected by upgrading the affected package to version 2.6.8.1-16.11. You need to reboot the computer after doing a standard system upgrade to effect the necessary changes. ATTENTION: Due to an unavoidable ABI change this kernel got a new version number, which requires to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Details follow: CAN-2004-0176: Michael Kerrisk noticed an insufficient permission checking in the shmctl() function. Any process was permitted to lock/unlock any System V shared memory segment that fell within the the RLIMIT_MEMLOCK limit (that is the maximum size of shared memory that unprivileged users can acquire). This allowed am unprivileged user process to unlock locked memory of other processes, thereby allowing them to be swapped out. Usually locked shared memory is used to store passphrases and other sensitive content which must not be written to the swap space (where it could be read out even after a reboot). CAN-2005-0177: OGAWA Hirofumi noticed that the table sizes in nls_ascii.c were incorrectly set to 128 instead of 256. This caused a buffer overflow in some cases which could be exploited to crash the kernel. CAN-2005-0178: A race condition was found in the terminal handling of the "setsid()" function, which is used to start new process sessions. http://oss.sgi.com/archives/netdev/2005-01/msg01036.html: David Coulson noticed a design flaw in the netfilter/iptables module. By sending specially crafted packets, a remote attacker could exploit this to crash the kernel or to bypass firewall rules. Fixing this vulnerability required a change in the Application Binary Interface (ABI) of the kernel. This means that third party user installed modules might not work any more with the new kernel, so this fixed kernel has a new ABI version number. You have to recompile and reinstall all third party modules.