RHEL 6 : system-config-firewall (RHSA-2011:0953)

Medium Nessus Plugin ID 55616


The remote Red Hat host is missing one or more security updates.


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.

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.


Update the affected packages.

See Also



Plugin Details

Severity: Medium

ID: 55616

File Name: redhat-RHSA-2011-0953.nasl

Version: $Revision: 1.12 $

Type: local

Agent: unix

Published: 2011/07/19

Modified: 2017/01/04

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 6

Temporal Score: 5.2

Vector: CVSS2#AV:L/AC:H/Au:S/C:C/I:C/A:C

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:system-config-firewall, p-cpe:/a:redhat:enterprise_linux:system-config-firewall-base, p-cpe:/a:redhat:enterprise_linux:system-config-firewall-tui, p-cpe:/a:redhat:enterprise_linux:system-config-printer, p-cpe:/a:redhat:enterprise_linux:system-config-printer-debuginfo, p-cpe:/a:redhat:enterprise_linux:system-config-printer-libs, p-cpe:/a:redhat:enterprise_linux:system-config-printer-udev, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:6.1

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2011/07/18

Reference Information

CVE: CVE-2011-2520

BID: 48715

OSVDB: 73976

RHSA: 2011:0953