full-disclosure - Re: [FD] [oss-security] CVE-2014-0196: Linux kernel pty layer race condition memory corruption

Open Source and information security mailing list archives

Date: Mon, 12 May 2014 16:03:10 +0530
From: Savio Bot <54v330@...il.com>
To: Matthew Daley <mattd@...fuzz.com>
Cc: fulldisclosure@...lists.org, oss-security@...ts.openwall.com
Subject: Re: [FD] [oss-security] CVE-2014-0196: Linux kernel pty layer race
 condition memory corruption

Hi,

So is this bug also present in 2.6?

Regards,
savio
On 12-May-2014 3:58 PM, "Matthew Daley" <mattd@...fuzz.com> wrote:

> 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
> >
> >
>
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