CUPS: Memory corruption

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200711-16 / cups
Release Date	November 12, 2007
Latest Revision	November 12, 2007: 01
Impact	high
Exploitable	remote

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

Related bugreports: #196736

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

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:

Code Listing 3.1: Resolution

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

4. References

CVE-2007-4351

Page updated November 12, 2007

Summary: This is a Gentoo Linux Security Advisory

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