libpng png_set_rgb_to_gray() buffer overflow

libpng-pngsetrgbtogray-bo (64637) The risk level is classified as HighHigh Risk


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.


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


Gain Access


Upgrade to the latest version of libpng (1.5.1beta01 or later), available from the libpng Web site. See 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: pngrtran.c in libpng 1.5.x before 1.5.1 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted palette-based PNG image that triggers a buffer overflow, related to the png_do_expand_palette function, the png_do_rgb_to_gray function, and an integer underflow. NOTE: some of these details are obtained from third party information.
  • OSVDB ID: 70417: libpng pngrtran.c png_do_rgb_to_gray() Function PNG File Handling Overflow
  • SA42863: libpng png_do_rgb_to_gray() PNG Processing Vulnerability
  • SECTRACK ID: 1024955: libpng Memory Corruption Error in png_do_rgb_to_gray() May Let Remote Users Execute Arbitrary Code
  • US-CERT VU#643140: Libpng 1.5.0 png_set_rgb_to_gray() vulnerability

Platforms Affected:

  • libpng libpng 1.5.0


Jan 08, 2011

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