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

2007.03.06

Credit: Paul Szabo

Risk: Medium

Local: Yes

Remote: No

CVE: CVE-2006-7094

CWE: CWE-Other

CVSS Base Score: 8.5/10

Impact Subscore: 10/10

Exploitability Subscore: 6.8/10

Exploit range: Remote

Attack complexity: Medium

Authentication: Single time

Confidentiality impact: Complete

Integrity impact: Complete

Availability impact: Complete

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 (at) maths.usyd.edu (dot) au [email concealed]   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia

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

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