Synopsis

Moderate: cups security update

Type/Severity

Security Advisory: Moderate

Topic

Updated cups packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

[Updated 12th January 2010]
The packages list in this erratum has been updated to include missing i386
packages for Red Hat Enterprise Linux Desktop and RHEL Desktop Workstation.

Description

The Common UNIX Printing System (CUPS) provides a portable printing layer
for UNIX operating systems.

A use-after-free flaw was found in the way CUPS handled references in its
file descriptors-handling interface. A remote attacker could, in a
specially-crafted way, query for the list of current print jobs for a
specific printer, leading to a denial of service (cupsd crash).
(CVE-2009-3553)

Several cross-site scripting (XSS) flaws were found in the way the CUPS web
server interface processed HTML form content. If a remote attacker could
trick a local user who is logged into the CUPS web interface into visiting
a specially-crafted HTML page, the attacker could retrieve and potentially
modify confidential CUPS administration data. (CVE-2009-2820)

Red Hat would like to thank Aaron Sigel of Apple Product Security for
responsibly reporting the CVE-2009-2820 issue.

Users of cups are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing the
update, the cupsd daemon will be restarted automatically.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.4 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.4 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.4 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.4 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 529833 - CVE-2009-2820 cups: Several XSS flaws in forms processed by CUPS web interface
• BZ - 530111 - CVE-2009-3553 cups: Use-after-free (crash) due improper reference counting in abstract file descriptors handling interface

CVEs

• CVE-2009-2820
• CVE-2009-3553

References