Red Hat Security Advisory
Synopsis: Moderate: system-config-firewall security update
Advisory ID: RHSA-2011:0953-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-0953.html
Issue date: 2011-07-18
CVE Names: CVE-2011-2520
Updated system-config-firewall packages that fix one security issue are now
available for Red Hat Enterprise Linux 6.
The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - noarch
Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch
Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64
system-config-firewall is a graphical user interface for basic firewall
It was found that system-config-firewall used the Python pickle module in
an insecure way when sending data (via D-Bus) to the privileged back-end
mechanism. A local user authorized to configure firewall rules using
system-config-firewall could use this flaw to execute arbitrary code with
root privileges, by sending a specially-crafted serialized object.
Red Hat would like to thank Marco Slaviero of SensePost for reporting this
Notation) for data exchange, instead of pickle. Therefore, an updated
version of system-config-printer that uses this new communication data
format is also provided in this erratum.
Users of system-config-firewall are advised to upgrade to these updated
packages, which contain a backported patch to resolve this issue. Running
instances of system-config-firewall must be restarted before the utility
will be able to communicate with its updated back-end.
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
5. Bugs fixed (http://bugzilla.redhat.com/):
717985 - CVE-2011-2520 system-config-firewall: privilege escalation flaw via use of python pickle