From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Jul 07 2005 - 09:37:23 CDT

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TITLE:
GNATS Arbitrary File Overwrite Security Issue

SECUNIA ADVISORY ID:
SA15963

VERIFY ADVISORY:
http://secunia.com/advisories/15963/

CRITICAL:
Less critical

IMPACT:
Security Bypass, Manipulation of data, System access

WHERE:
Local system

SOFTWARE:
GNATS 3.x
http://secunia.com/product/1751/
GNATS 4.x
http://secunia.com/product/1752/

DESCRIPTION:
A security issue has been reported in GNATS, which can be exploited
by malicious, local users to overwrite arbitrary files on a
vulnerable system.

The security issue is caused due to "gen-index" being installed with
suid root when compiled from sources and when the "gnat" user and
group do not exist. This can be exploited by malicious users to
overwrite arbitrary files by running "gen-index" with the filename to
overwrite as the parameter to the "-o" argument.

The security issue has been reported in version 4.0 and 4.1.0. Prior
versions might also be affected.

SOLUTION:
Remove the suid bits from "gen-index".

PROVIDED AND/OR DISCOVERED BY:
pi3ki31ny

ORIGINAL ADVISORY:
http://www.pi3.int.pl/adv/gnats.txt

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