bugtraq - /bin/login gives root to group utmp

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Message-Id: <200811301951.mAUJpBmR013125@bari.maths.usyd.edu.au>
Date: Mon, 1 Dec 2008 06:51:11 +1100
From: Paul Szabo <psz@...hs.usyd.edu.au>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk
Subject: /bin/login gives root to group utmp

There is a group-utmp-to-root privilege escalation vulnerability in
/bin/login in Debian, and I expect in all other Linux distros.
For details and exploit please see

  http://bugs.debian.org/505271

Currently am not aware of any group utmp issues (that could be
leveraged to get root).

Cheers,

Paul Szabo   psz@...hs.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia