AusCERT - ESB-2011.0063.2 - UPDATE [UNIX/Linux] libpng: Execute arbitrary code/commands

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ESB-2011.0063.2 - UPDATE [UNIX/Linux] libpng: Execute arbitrary code/commands - Remote with user interaction
Date: 10 February 2012

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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

The information within this database may change without notice. Use of this 
information constitutes acceptance for use in an AS IS condition. There are 
NO warranties, implied or otherwise, with regard to this information or its 
use. Any use of this information is at the user's risk. In no event shall the 
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any damages whatsoever arising out of or in connection with the use or spread 
of this information.

For corrections or additions please email xforce@iss.net

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