CVE Database


Impact: Low
Public: 2009-06-28
Bugzilla: 518182: CVE-2009-2855 squid: DoS (100% CPU use) while processing certain external ACL helper HTTP headers


The MITRE CVE dictionary describes this issue as:

The strListGetItem function in src/HttpHeaderTools.c in Squid 2.7 allows remote attackers to cause a denial of service via a crafted auth header with certain comma delimiters that trigger an infinite loop of calls to the strcspn function.

Find out more about CVE-2009-2855 from the MITRE CVE dictionary and NIST NVD.


This issue did not affect the versions of the squid packages, as shipped with Red Hat Enterprise Linux 3 and 4.
The issue was addressed in the squid packages as shipped with Red Hat Enterprise Linux 5 via:

CVSS v2 metrics

Base Score: 2.9
Base Metrics: AV:A/AC:M/Au:N/C:N/I:N/A:P
Access Vector: Adjacent Network
Access Complexity: Medium
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 5 (squid) RHSA-2010:0221 March 29, 2010

External References

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