bugtraq - /bin/ls with gid=0 in Debian linux-ftpd

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Message-Id: <200702202324.l1KNOW7c025502@asti.maths.usyd.edu.au>
Date: Wed, 21 Feb 2007 10:24:32 +1100
From: Paul Szabo <psz@...hs.usyd.edu.au>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk
Subject: /bin/ls with gid=0 in Debian linux-ftpd

Mea culpa. A stupid little bug crept into linux-ftpd for Debian, and
some other Linux distros. Some may have fixed it, but Debian hasn't.
The effect is that ftpd now runs /bin/ls (for DIR and similar commands)
with GID=0. Does not seem terribly dangerous as I do not seem able to
trick ls into running anything, nor are there any interesting objects
thusly accessible. Would become a "root hole" if someone finds a way
to execute anything from /bin/ls (as started from ftpd).

Please see

  http://bugs.debian.org/384454

for details.

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