From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Apr 20 2004 - 06:09:30 CDT

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TITLE:
utempter Device Path Handling Security Issue

SECUNIA ADVISORY ID:
SA11417

VERIFY ADVISORY:
http://secunia.com/advisories/11417/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
utempter 0.5.x

DESCRIPTION:
Steve Grubb has discovered a security issue in utempter, which
potentially can be exploited by malicious, local users to perform
certain actions with higher privileges on a vulnerable system.

The program doesn't exit correctly when a path to a device contains
"/../", "/./", or "//". This may allow arbitrary files to be
overwritten via symlink attacks, if a higher privileged program
trusts information in the utmp file.

SOLUTION:
Grant only trusted user's access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Steve Grubb

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