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TITLE:
CUPS "lppasswd" Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA38789

VERIFY ADVISORY:
http://secunia.com/advisories/38789/

DESCRIPTION:
A vulnerability has been discovered in CUPS, which can be exploited
by malicious, local users to gain escalated privileges.

The vulnerability is caused due to the "lppasswd" utility (which may
be installed suid root) not properly verifying certain environment
variables (e.g. "LOCALEDIR") before using them. This can be exploited
to e.g. execute arbitrary code by tricking the utility into using a
specially crafted localisation file containing malicious format
strings.

The vulnerability is confirmed in version 1.3.11. Other versions may
also be affected.

Note: The manual page for "lppasswd" in version 1.3.11 recommends
administrators to change or disable the ownership of the file for
security reasons. CUPS 1.4.0, 1.4.1, and 1.4.2 do not install the
"lppasswd" utility as suid root by default.

SOLUTION:
Restrict access to trusted users only. Remove the suid-bit from the
"lppasswd" utility.

PROVIDED AND/OR DISCOVERED BY:
Ubuntu credits Ronald Volgers.

CHANGELOG:
2010-03-04: Increased "criticality".

ORIGINAL ADVISORY:
CUPS:
http://www.cups.org/str.php?L3482

Red Hat bug #558460:
https://bugzilla.redhat.com/show_bug.cgi?id=558460

USN-906-1:
https://lists.ubuntu.com/archives/ubuntu-security-announce/2010-March/001054.html

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