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             AUSCERT External Security Bulletin Redistribution

                              ESB-2011.0063.2
               libpng png_set_rgb_to_gray() buffer overflow
                             10 February 2012

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

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

Product:           libpng
Publisher:         ISS
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-0408  

Original Bulletin: 
   http://xforce.iss.net/xforce/xfdb/64637

Revision History:  February 10 2012: Corrected formatting
                   January  19 2011: Initial Release

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libpng png_set_rgb_to_gray() buffer overflow
libpng-pngsetrgbtogray-bo (64637) 	
The risk level is classified as High

Description:

libpng is vulnerable to a buffer overflow, caused by improper bounds checking 
by the png_set_rgb_to_gray() function. By persuading a victim to open a 
specially-crafted PNG file, a remote attacker could overflow a buffer and 
execute arbitrary code on the system or cause the application to crash.

*CVSS:
  Base Score: 			6.8
  Access Vector: 		Network
  Access Complexity: 		Medium
  Authentication: 		None
  Confidentiality Impact: 	Partial
  Integrity Impact: 		Partial
  Availability Impact: 		Partial
 
  Temporal Score: 		5
  Exploitability: 		Unproven
  Remediation Level: 		Official-Fix
  Report Confidence: 		Confirmed

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of libpng (1.5.1beta01 or later), available from 
the libpng Web site. See References.

References:

    * libpng Web Site: libpng is the official PNG reference library.
    * SourceForge: PNG and MNG/JNG image formats: Release of libpng-1.5.0.
    * BID-45761: Libpng 'png_set_rgb_to_gray()' Remote Code Execution 
      Vulnerability
    * CVE-2011-0408: ** RESERVED ** This candidate has been reserved by an 
      organization or individual that will use it when announcing a new 
      security problem. When the candidate has been publicized, the details 
      for this candidate will be provided.
    * SA42863: libpng png_do_rgb_to_gray() PNG Processing Vulnerability
    * VUPEN/ADV-2011-0080: Libpng png_set_rgb_to_gray() Transform Buffer 
      Overflow Vulnerability

Platforms Affected:

    * libpng libpng 1.5.0

Reported:

Jan 08, 2011

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