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                         AUSCERT Security Bulletin

                               ASB-2010.0070
    Apache HTTP mod_proxy_ajp susceptible to a remote denial of service
                               3 March 2010

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

Product:              Apache HTTP
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2010-0408  
Member content until: Friday, April  2 2010

OVERVIEW

        Apache has corrected a vulnerability in HTTP server mod_proxy_ajp.


IMPACT

        Apache state that "mod_proxy_ajp would return the wrong status code
        if it encountered an error causing a backend server to be put into 
        an error state until the retry timeout expired. A remote attacker 
        could send malicious requests to trigger this issue, resulting in a
        denial of service." [1]
        
        Apache state the following versions are affected:
        
            2.2.14, 
            2.2.13, 
            2.2.12, 
            2.2.11, 
            2.2.9, 
            2.2.8, 
            2.2.6, 
            2.2.5, 
            2.2.4, 
            2.2.3, 
            2.2.2, 
            2.2.0


MITIGATION

        This module is not enabled by default in most distribtions. Apache have
        fixed the vulnerability in 2.2.15-cvs. 


REFERENCES

        [1] Apache httpd 2.2 vulnerabilities
            http://httpd.apache.org/security/vulnerabilities_22.html

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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