Pardus: 2011-105: libpng: Multiple Vulnerabilities
Posted by Benjamin D. Thomas   
Multiple vulnerabilities have been fixed in libpng.
------------------------------------------------------------------------
Pardus Linux Security Advisory 2011-105           security@pardus.org.tr
------------------------------------------------------------------------
      Date: 2011-08-08
      Type: Remote
------------------------------------------------------------------------

Summary
======
Multiple vulnerabilities have been fixed in libpng.


Description
==========
CVE-2011-2690:

Buffer overflow in libpng 1.0.x before  1.0.55,  1.2.x  before  1.2.45,
1.4.x before 1.4.8, and 1.5.x before 1.5.4, when used by an application
that calls the png_rgb_to_gray  function  but  not  the  png_set_expand
function, allows remote attackers to overwrite memory with an arbitrary
amount of data, and possibly  have  unspecified  other  impact,  via  a
crafted PNG image.



CVE-2011-2691:

The png_err function in pngerror.c in libpng 1.0.x before 1.0.55, 1.2.x
before 1.2.45, 1.4.x before 1.4.8,  and  1.5.x  before  1.5.4  makes  a
function call using a NULL pointer argument instead of an  empty-string
argument, which allows remote attackers to cause a  denial  of  service
(application crash) via a crafted PNG image.



CVE-2011-2692:

The png_handle_sCAL function  in  pngrutil.c  in  libpng  1.0.x  before
1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4
does not properly handle  invalid  sCAL  chunks,  which  allows  remote
attackers  to cause  a  denial  of  service  (memory  corruption   and
application crash) or possibly have  unspecified  other  impact  via  a
crafted PNG image that triggers the reading of uninitialized memory.





Affected packages:

  Pardus 2009:
    libpng, all before 1.2.46-24-9

  Pardus 2011:
    libpng, all before 1.4.8-30-p11


Resolution
=========
There are update(s) for libpng. You can update them via Package Manager
or with a single command from console:

  Pardus 2009:
    pisi up libpng

  Pardus 2011:
    pisi up libpng


References
=========
  * http://bugs.pardus.org.tr/show_bug.cgi?id699

------------------------------------------------------------------------