GLSA 200711-16: CUPS: Memory corruption

http://security.gentoo.org/

Severity:	high
Title:	CUPS: Memory corruption
Date:	11/12/2007
Bugs:	#196736
ID:	200711-16

Synopsis

CUPS contains a boundary checking error that might lead to the execution of arbitrary code.

Background

CUPS provides a portable printing layer for UNIX-based operating systems.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-print/cups	< 1.2.12-r2	>= 1.2.12-r2	All supported architectures

Description

Alin Rad Pop (Secunia Research) discovered an off-by-one error in the ippReadIO() function when handling Internet Printing Protocol (IPP) tags that might allow to overwrite one byte on the stack.

Impact

A local attacker could send a specially crafted IPP request containing "textWithLanguage" or "nameWithLanguage" tags, leading to a Denial of Service or the execution of arbitrary code with the privileges of the "lp" user. If CUPS is configured to allow network printing, this vulnerability might be remotely exploitable.

Workaround

To avoid remote exploitation, network access to CUPS servers on port 631/udp should be restricted. In order to do this, update the "Listen" setting in cupsd.conf to "Listen localhost:631" or add a rule to the system's firewall. However, this will not avoid local users from exploiting this vulnerability.

Resolution

All CUPS users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-print/cups-1.2.12-r2"

References

CVE-2007-4351

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200711-16.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.