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Category:   Application (Security)  >   system-config-firewall Vendors:   Red Hat
Red Hat system-config-firewall Lets Local Users Gain Root Privileges
SecurityTracker Alert ID:  1025793
SecurityTracker URL:  http://securitytracker.com/id/1025793
CVE Reference:   CVE-2011-2520   (Links to External Site)
Date:  Jul 19 2011
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Red Hat system-config-firewall. A local user can obtain root privileges on the target system.

The system-config-firewall utility uses the Python pickle module in an insecure way when sending data (via D-Bus) to the privileged back-end mechanism. A local user with privileges to configure firewall rules can exploit this to send a specially-crafted serialized object to execute arbitrary commands on the target system with root privileges.

Marco Slaviero of SensePost reported this vulnerability.

Impact:   A local user can obtain root privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0953.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2011-0953.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   None.


 Source Message Contents

Subject:  [RHSA-2011:0953-01] Moderate: system-config-firewall security update

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=====================================================================
                   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 
=====================================================================

1. Summary:

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

3. 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.

4. 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
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

717985 - CVE-2011-2520 system-config-firewall: privilege escalation flaw via use of python pickle

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/system-config-firewall-1.2.27-3.el6_1.3.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/system-config-printer-1.1.16-17.el6_1.2.src.rpm

i386:
system-config-printer-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-debuginfo-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-libs-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.i686.rpm

noarch:
system-config-firewall-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-base-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-tui-1.2.27-3.el6_1.3.noarch.rpm

x86_64:
system-config-printer-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-debuginfo-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-libs-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/system-config-firewall-1.2.27-3.el6_1.3.src.rpm

noarch:
system-config-firewall-base-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-tui-1.2.27-3.el6_1.3.noarch.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/system-config-firewall-1.2.27-3.el6_1.3.src.rpm

noarch:
system-config-firewall-1.2.27-3.el6_1.3.noarch.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/system-config-firewall-1.2.27-3.el6_1.3.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/system-config-printer-1.1.16-17.el6_1.2.src.rpm

i386:
system-config-printer-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-debuginfo-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-libs-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.i686.rpm

noarch:
system-config-firewall-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-base-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-tui-1.2.27-3.el6_1.3.noarch.rpm

ppc64:
system-config-printer-1.1.16-17.el6_1.2.ppc64.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.ppc64.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.ppc64.rpm

s390x:
system-config-printer-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-libs-1.1.16-17.el6_1.2.s390x.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.s390x.rpm

x86_64:
system-config-printer-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-debuginfo-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-libs-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/system-config-firewall-1.2.27-3.el6_1.3.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/system-config-printer-1.1.16-17.el6_1.2.src.rpm

i386:
system-config-printer-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-debuginfo-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-libs-1.1.16-17.el6_1.2.i686.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.i686.rpm

noarch:
system-config-firewall-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-base-1.2.27-3.el6_1.3.noarch.rpm
system-config-firewall-tui-1.2.27-3.el6_1.3.noarch.rpm

x86_64:
system-config-printer-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-debuginfo-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-libs-1.1.16-17.el6_1.2.x86_64.rpm
system-config-printer-udev-1.1.16-17.el6_1.2.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-2520.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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