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                         AUSCERT Security Bulletin

                               ASB-2010.0081
                  IBM HTTP Server mod_isapi vulnerability
                               17 March 2010

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

Product:              IBM HTTP Server
Operating System:     Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                      Denial of Service               -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2010-0425  
Member content until: Friday, April 16 2010
Reference:            ASB-2010.0073

Comment: Administrators can check if their system is vulnerable by examining
         the httpd.conf file and determining whether mod_isapi has been
         enabled.

OVERVIEW

        IBM have released a fix to the mod_isapi module for IBM HTTP Server
        correcting a security vulnerability.


IMPACT

        The vendor has provided the following information regarding this
        vulnerability:
        
        "Repeated malicious requests to URLs configured to be handled by 
        mod_isapi can cause errors, crashes, or remote execution." [1]
        
        This affects Windows users of version 6.0 or 6.1 of IBM HTTP
        Server who have enabled the use of mod_isapi (not in use by 
        default). [1]


MITIGATION

        Users can disable the affected module or apply the fix provided 
        by IBM. [1]


REFERENCES

        [1] PM09447: CVE-2010-0425 MOD_ISAPI VULNERABILITY
            http://www-01.ibm.com/support/docview.wss?uid=swg1PM09447

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

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