CVE Database


Impact: Moderate
Public: 2011-06-06
Bugzilla: 750316: CVE-2011-4096 squid: Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record


The MITRE CVE dictionary describes this issue as:

The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.

Find out more about CVE-2011-4096 from the MITRE CVE dictionary and NIST NVD.


This issue did not affect the versions of squid as shipped with Red Hat Enterprise Linux 4 and 5 as they did not include IPv6 support. This issue was introduced with the addition of IPv6 support in Squid 3.1 (in the changes made to the idnsGrokReply function).

CVSS v2 metrics

Base Score: 3.3
Base Metrics: AV:A/AC:L/Au:N/C:N/I:N/A:P
Access Vector: Adjacent Network
Access Complexity: Low
Authentication: None
Confidentiality Impact: None
Integrity Impact: None
Availability Impact: Partial

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 version 6 (squid) RHSA-2011:1791 December 06, 2011

External References

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For clarification or corrections please contact the Red Hat Security Response Team.