AusCERT - ASB-2011.0076.2 - UPDATE [Win][UNIX/Linux] Apache HTTPD: Denial of service

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ASB-2011.0076.2 - UPDATE [Win][UNIX/Linux] Apache HTTPD: Denial of service - Remote/unauthenticated

Date: 16 September 2011
References: ESB-2011.0870.2 ESB-2011.0950 ASB-2011.0080 ESB-2011.0966 ESB-2011.0967 ESB-2011.0984.2 ESB-2011.1039 ASB-2011.0091 ESB-2011.1063 ESB-2011.1104
ESB-2011.1115 ASB-2012.0007 ASB-2012.0009 ESB-2012.0114 ESB-2012.0377 ESB-2012.0386 ESB-2012.0437 ESB-2012.0532 ASB-2012.0103 ESB-2012.0973

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===========================================================================
                         AUSCERT Security Bulletin

                              ASB-2011.0076.2
                Apache HTTP Server (httpd) 2.2.21 Released
                             16 September 2011

===========================================================================

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

Product:              Apache HTTPD
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2011-3348 CVE-2011-3192 
Member content until: Saturday, October 15 2011
Reference:            ESB-2011.0870.2

Revision History:     September 16 2011: Fixed formatting
                      September 15 2011: Initial Release

OVERVIEW

        Apache HTTP Server (httpd) 2.2.21 has been released fixing a 
        denial of service vulnerability. [1]


IMPACT

        The Apache Software Foundation states that the 2.2.21 release 
        resolves the following security issues:
        
        "A flaw was found when mod_proxy_ajp is used together with
        mod_proxy_balancer. Given a specific configuration, a remote attacker
        could send certain malformed HTTP requests, putting a backend server
        into an error state until the retry timeout expired. This could lead
        to a temporary denial of service." [1]
        
        This update (version 2.2.21) also includes further fixes to
        CVE-2011-3192. [2]


MITIGATION

        The Apache Software Foundation has made Apache http 2.2.21 available
        for download via its websites and mirrors. [3]


REFERENCES

        [1] Fixed in Apache httpd 2.2.21
            http://httpd.apache.org/security/vulnerabilities_22.html

        [2] Range header DoS vulnerability Apache HTTPD
            http://httpd.apache.org/security/CVE-2011-3192.txt

        [3] Downloading the Apache HTTP Server
            http://httpd.apache.org/download.cgi

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.

===========================================================================
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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