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                         AUSCERT Security Bulletin

                              ASB-2009.1068.2
              Squid Denial of Service Vulnerability Corrected
                             23 September 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Squid
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-2855  
Member content until: Thursday, October  1 2009

Comment: At the time of this publication a Squid Security Advisory had not
         been issued for this vulnerability.

Revision History:     September 23 2009: Added CVE Reference
                      September  1 2009: Initial Release

OVERVIEW

        A security vulnerability has been identified in Squid.


IMPACT

        The vendor has assigned bug 2541 to this vulnerability which is 
        describe as:
        
        "Hang in 100% CPU loop while extacting header details using a 
        delimiter other than comma (external_acl_type, access_log_format, 
        external_refresh_check)" [1]


MITIGATION

        A proposed patch has been made available on the vendor's site [2],
        administrators should test this patch before using it in a live
        environement. This bug is also listed as corrected in the changeset 
        for Squid 3.0 [3]. Other versions of Squid may also be affected.


REFERENCES

        [1] Bug 2541 - Hang in 100% CPU loop while extacting header details
            using a delimiter other than comma (external_acl_type,
            access_log_format, external_refresh_check)
            http://www.squid-cache.org/bugs/show_bug.cgi?id=2541

        [2] Bug 2541 - Proposed Patch
            http://www.squid-cache.org/bugs/attachment.cgi?id=2041

        [3] Squid 3.0 changes
            http://www.squid-cache.org/Versions/v3/3.0/changesets/

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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