[ GLSA 201206-15 ] libpng: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: libpng: Multiple vulnerabilities (GLSA 201206-15)
Severity: normal
Exploitable: remote
Date: June 22, 2012
Updated: June 02, 2014
Bug(s): #373967, #386185, #401987, #404197, #410153
ID: 201206-15

Synopsis

Multiple vulnerabilities in libpng might allow remote attackers to
execute arbitrary code or cause a Denial of Service condition.


Background

libpng is a standard library used to process PNG (Portable Network
Graphics) images. It is used by several programs, including web browsers
and potentially server processes.


Affected Packages

Package: media-libs/libpng
Vulnerable: < 1.5.10
Unaffected: >= 1.5.10
Unaffected: >= 1.2.49 < 1.2.50
Unaffected: >= 1.2.50 < 1.2.51
Unaffected: >= 1.2.51 < 1.2.52
Architectures: All supported architectures


Description

Multiple vulnerabilities have been discovered in libpng:

• The “embedded_profile_len()” function in pngwutil.c does not
  check for negative values, resulting in a memory leak (CVE-2009-5063).
  
• The “png_format_buffer()” function in pngerror.c contains an
  off-by-one error (CVE-2011-2501).
  
• The “png_rgb_to_gray()” function in pngrtran.c contains an
  integer overflow error (CVE-2011-2690).
  
• The “png_err()” function in pngerror.c contains a NULL pointer
  dereference error (CVE-2011-2691).
  
• The “png_handle_sCAL()” function in pngrutil.c improperly handles
  malformed sCAL chunks(CVE-2011-2692).
  
• The “png_decompress_chunk()” function in pngrutil.c contains an
  integer overflow error (CVE-2011-3026).
  
• The “png_inflate()” function in pngrutil.c contains and out of
  bounds error (CVE-2011-3045).
  
• The “png_set_text_2()” function in pngset.c contains an error
  which could result in memory corruption (CVE-2011-3048).
  
• The “png_formatted_warning()” function in pngerror.c contains an
  off-by-one error (CVE-2011-3464).
  

Impact

An attacker could exploit these vulnerabilities to execute arbitrary
code with the permissions of the user running the vulnerable program,
which could be the root user, or to cause programs linked against the
library to crash.


Workaround

There is no known workaround at this time.

Resolution

All libpng 1.5 users should upgrade to the latest version: