/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

See this note in RAW Version

Vote for this issue:

50%

Thanks for you vote!

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.

Nick (*)

Email (*)

Video

Text (*)

(*) - required fields.

{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1

{{ x.comment }}

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

Thanks for you vote!

Thanks for you comment!Your message is in quarantine 48 hours.

Thanks for you comment!
Your message is in quarantine 48 hours.