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Public Date:
765964: CVE-2011-4600 libvirt: unintended firewall port exposure after restarting libvirtd when defining a bridged forward-mode network

The MITRE CVE dictionary describes this issue as:

The networkReloadIptablesRules function in network/bridge_driver.c in libvirt before 0.9.9 does not properly handle firewall rules on bridge networks when libvirtd is restarted, which might allow remote attackers to bypass intended access restrictions via a (1) DNS or (2) DHCP query.

Find out more about CVE-2011-4600 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue affect Red Hat Enterprise Linux 6 and has been addressed via Red Hat Enterprise Linux 5 is
not affected. The Red Hat Security Response Team has rated this issue as having
low security impact. For additional information, refer to the Issue Severity

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 2.6
Base Metrics AV:N/AC:H/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux Extended Update Support 6.2 (libvirt) RHBA-2012:0013 2012-01-17

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 libvirt Not affected

Last Modified