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                         AUSCERT Security Bulletin

                              ASB-2010.0157.2
        A number of vulnerabilities have been identified in libpng
                                1 July 2010

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

Product:              libpng prior to 1.4.3
                      libpng prior to 1.2.44
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Remote with User Interaction
                      Denial of Service               -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2010-1205 CVE-2010-2249 
Member content until: Thursday, July 29 2010

Revision History:     July  1 2010: Added CVE reference
                      June 29 2010: Initial Release

OVERVIEW

        A number of vulnerabilities have been identified in libpng, which have 
        been corrected in versions 1.4.3 and 1.2.44.


IMPACT

        The vendor has provided the following description of these
        vulnerabilities:
        
        "Several versions of libpng through 1.4.2 (and through 1.2.43 in the 
        older series) contain a bug whereby progressive applications such as 
        web browsers (or the rpng2 demo app included in libpng) could receive 
        an extra row of image data beyond the height reported in the header, 
        potentially leading to an out-of-bounds write to memory (depending on 
        how the application is written) and the possibility of execution of 
        an attacker's code with the privileges of the libpng user (including 
        remote compromise in the case of a libpng-based browser visiting a 
        hostile web site). This vulnerability has been assigned ID 
        CVE-2010-1205 (via Mozilla).
        
        An additional memory-leak bug, involving images with malformed sCAL 
        chunks, is also present; it could lead to an application crash 
        (denial of service) when viewing such images." [1]


MITIGATION

        The vendor recommends upgrading to the latest version of libpng. [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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