Issued:

2011-07-18

Updated:

2011-07-18

RHSA-2011:0953 - Moderate: system-config-firewall security update

Synopsis

Moderate: system-config-firewall security update

Type/Severity

Security Advisory Moderate

Topic

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.

Description

system-config-firewall is a graphical user interface for basic firewall setup.

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. (CVE-2011-2520)

Red Hat would like to thank Marco Slaviero of SensePost for reporting this issue.

This erratum updates system-config-firewall to use JSON (JavaScript Object 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.

Solution

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 This content is not included.https://access.redhat.com/kb/docs/DOC-11259

Affected Products

Updated Packages

• system-config-firewall-1.2.27-3.el6_1.3.noarch.rpm
• system-config-printer-udev-1.1.16-17.el6_1.2.x86_64.rpm
• system-config-printer-1.1.16-17.el6_1.2.s390x.rpm
• system-config-firewall-base-1.2.27-3.el6_1.3.noarch.rpm
• system-config-printer-debuginfo-1.1.16-17.el6_1.2.x86_64.rpm
• system-config-printer-debuginfo-1.1.16-17.el6_1.2.ppc64.rpm
• system-config-printer-libs-1.1.16-17.el6_1.2.i686.rpm
• system-config-firewall-1.2.27-3.el6_1.3.src.rpm
• system-config-printer-1.1.16-17.el6_1.2.x86_64.rpm
• system-config-printer-libs-1.1.16-17.el6_1.2.s390x.rpm
• system-config-printer-debuginfo-1.1.16-17.el6_1.2.s390x.rpm
• system-config-printer-udev-1.1.16-17.el6_1.2.s390x.rpm
• system-config-printer-1.1.16-17.el6_1.2.src.rpm
• system-config-printer-udev-1.1.16-17.el6_1.2.i686.rpm
• system-config-firewall-tui-1.2.27-3.el6_1.3.noarch.rpm
• system-config-printer-1.1.16-17.el6_1.2.i686.rpm
• system-config-printer-1.1.16-17.el6_1.2.ppc64.rpm
• system-config-printer-udev-1.1.16-17.el6_1.2.ppc64.rpm
• system-config-printer-libs-1.1.16-17.el6_1.2.ppc64.rpm
• system-config-printer-libs-1.1.16-17.el6_1.2.x86_64.rpm
• system-config-printer-debuginfo-1.1.16-17.el6_1.2.i686.rpm

Fixes

• This content is not included.BZ - 717985

CVEs

• CVE-2011-2520

References

• https://access.redhat.com/security/updates/classification/#moderate

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.