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AA-2008.0205                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                   libpng buffer overflow vulnerability
                             24 September 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              libpng versions 1.2.30 and 1.2.31
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Root Compromise
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-3964
Member content until: Wednesday, October 22 2008

Original Bulletin:    http://www.libpng.org/pub/png/libpng.html


OVERVIEW:
        
        libpng versions prior to 1.2.32 contain a buffer overflow 
        vulnerability. Updates have been released to correct this issue.


IMPACT: 

        The libpng web site [1] contains the following information regarding
        this buffer overflow vulnerability:

         "Versions 1.2.30 and 1.2.31 of libpng can crash when reading images 
          with multiple zTXt chunks; it is likely that this vulnerability 
          could lead to a remote compromise in the case of a libpng-based 
          browser visiting a hostile web site. This vulnerability has been 
          assigned ID CVE-2008-3964 and is fixed in version 1.2.32, released 
          18 September 2008."


MITIGATION:

        Upgrade to libpng version 1.2.32, available from the libpng site [1].


REFERENCES:

        [1] libpng Home Page
            http://www.libpng.org/pub/png/libpng.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

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