Date: Thu, 27 Oct 2011 15:00:24 +0530 From: Huzaifa Sidhpurwala <huzaifas@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: CVE request: kernel: crypto: ghash: null pointer deref if no key is set On 10/27/2011 02:40 PM, Eugene Teo wrote: > Description from the commit: The ghash_update function passes a pointer > to gf128mul_4k_lle which will be NULL if ghash_setkey is not called or > if the most recent call to ghash_setkey failed to allocate memory. This > causes an oops. Fix this up by returning an error code in the null case. > > This is trivially triggered from unprivileged userspace through the > AF_ALG interface by simply writing to the socket without setting a key. > > The ghash_final function has a similar issue, but triggering it requires > a memory allocation failure in ghash_setkey _after_ at least one > successful call to ghash_update. > > References: > https://bugzilla.redhat.com/show_bug.cgi?id=749475 > https://secunia.com/advisories/46584/ > https://bugs.gentoo.org/show_bug.cgi?id=388581 > > Upstream commit: > http://git.kernel.org/linus/7ed47b7d142ec99ad6880bbbec51e9f12b3af74c > > +config CRYPTO_GHASH > was added in commit 2cdc6899, v2.6.32-rc1. > This has been assigned CVE-2011-4081 -- Huzaifa Sidhpurwala / Red Hat Security Response Team
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