Date: Thu, 3 Jul 2008 18:05:20 +0200 From: Marcus Meissner <meissner@...e.de> To: oss-security@...ts.openwall.com Subject: 22.214.171.124 security fixes, please assign CVE id http://lwn.net/Articles/288473/ > Stable kernel 126.96.36.199 > Posted Jul 3, 2008 15:34 UTC (Thu) by PaXTeam (subscriber, #24616) [Link] > ..and once again, users get the usual treatment of not actually being told why an upgrade is > so strongly encouraged. it seems that in this episode of the -stable security fix coverup > series (that's not to say that the corresponding vanilla commits got a better treatment), we > got at least two fine examples of how such bugs should not fall victim of the kernel devs' > full disclosure policy. > > as for the particular bugs: > > 1. > http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.25.y.git;a=commitdiff;h=2a739dd53ad7ee010ae6e155438507f329dce788 > adds several checks against NULL function pointers, which is an immediate 'get direct ring-0 > code execution' flag, unfortunately we don't learn whether this is actually possible or not, > but one assumes the STRONGLY encouraged upgrade wasn't for nothing at least. This is CVE-2008-2812. > 2. > http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.25.y.git;a=commitdiff;h=1e9a615bfce7996ea4d815d45d364b47ac6a74e8 > is an even better one, it allows one to overflow the task struct refcount (a 32 bit atomic_t > on the affected amd64) and cause its subsequent freeing with dangling references to it all > over the place (including 'current' of the ptraced task itself). corresponding exploit avenues > abound. I don't know if this one has a CVE yet. > Greg, instead of witchhunting on vendor-sec you guys should sit down and decide what you want > for your disclosure policy for real. the next Kernel Summit would be a good opportunity i > think. [no comment] Ciao, Marcus -- Working, but not speaking, for the following german company: SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
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