Date: Mon, 12 May 2014 21:15:10 +1200 From: Matthew Daley <mattd@...fuzz.com> To: oss-security@...ts.openwall.com Cc: fulldisclosure@...lists.org, bugtraq@...urityfocus.com Subject: Re: CVE-2014-0196: Linux kernel pty layer race condition memory corruption 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 >
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