Date: Mon, 12 May 2014 21:23:57 +1200 From: Matthew Daley <mattd@...fuzz.com> To: oss-security@...ts.openwall.com Cc: fulldisclosure@...lists.org Subject: Re: CVE-2014-0196: Linux kernel pty layer race condition memory corruption Sorry, forgot to mention that this targets 64-bit kernels. On Mon, May 12, 2014 at 9:15 PM, Matthew Daley <mattd@...fuzz.com> wrote: > Hi, > > I've written a "slightly-less-than-POC" privilege escalation exploit for > this vulnerability that works on newer kernels: > http://bugfuzz.com/stuff/cve-2014-0196-md.c (SHA1: > 6b1c5c651231b33a5e11b5c8c6ed07cd15f658f5) > > Note the warning mentioned in the header; run it at your own risk ;) > > - Matthew Daley > > > On Mon, May 5, 2014 at 10:08 PM, Marcus Meissner <meissner@...e.de> wrote: >> >> Hi, >> >> SUSE customer Ericsson reported a kernel crash to us which turned out >> to be a race condition in the PTY write buffer handling. >> >> When two processes/threads write to the same pty, the buffer end could >> be overwritten and so memory corruption into adjacent buffers could lead >> to crashes / code execution. >> >> Jiri Slaby and Peter Hurley localized and fixed this problem. >> >> CVE-2014-0196 has been assigned to this issue. >> >> Jiri thinks this was introduced during 2.6.31 development by >> d945cb9cce20ac7143c2de8d88b187f62db99bdc (pty: Rework the pty >> layer to use the normal buffering logic) in 2.6.31-rc3. Until then, pty >> was writing directly to a line discipline without using buffers. >> >> https://bugzilla.novell.com/show_bug.cgi?id=875690 >> >> Patch is also attached. >> >> Ciao, Marcus > >
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Powered by Openwall GNU/*/Linux - Powered by OpenVZ