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AA-2007.0086                  AUSCERT Advisory

                               [UNIX/Linux]
           Multiple denial of service vulnerabilities in libpng
                              18 October 2007
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        AusCERT Advisory Summary
        ------------------------

Product:              libpng versions prior to 1.2.22
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-5266 CVE-2007-5267 CVE-2007-5268
                      CVE-2007-5269
Member content until: Thursday, November 15 2007

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


OVERVIEW:
        
        libpng versions prior to 1.2.22 contain several denial of service 
        vulnerabilities. Updates have been released to correct these issues.


IMPACT: 

        The libpng web site [1] contains the following information regarding
        these denial of service vulnerabilities:

         o CVE-2007-5266, CVE-2007-5268, CVE-2007-5269: "Versions 1.2.20 and 
           earlier have a number of potential crash-bugs due to out-of-bounds 
           reads in certain chunk-handlers"

         o CVE-2007-5267: "Version 1.2.21 has a crash bug when reading the 
           ICC-profile chunk, iCCP"


MITIGATION:

        All of the above denial of service vulnerabilities are corrected in
        libpng version 1.2.22, which is available from the web 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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