Synopsis:    Moderate: libpng security update
Issue Date:  2011-07-28
CVE Numbers: CVE-2011-2501
              CVE-2011-2690
              CVE-2011-2692


The libpng packages contain a library of functions for creating and
manipulating PNG (Portable Network Graphics) image format files.

A buffer overflow flaw was found in the way libpng processed certain PNG
image files. An attacker could create a specially-crafted PNG image 
that, when opened, could cause an application using libpng to crash or,
potentially, execute arbitrary code with the privileges of the user 
running the application. (CVE-2011-2690)

Note: The application behavior required to exploit CVE-2011-2690 is 
rarely used. No application shipped with Scientific Linux behaves this 
way, for example.

An out-of-bounds memory read flaw was found in the way libpng processed
certain PNG image files. An attacker could create a specially-crafted 
PNG image that, when opened, could cause an application using libpng to 
crash. (CVE-2011-2501)

An uninitialized memory read issue was found in the way libpng processed
certain PNG images that use the Physical Scale (sCAL) extension. An
attacker could create a specially-crafted PNG image that, when opened,
could cause an application using libpng to crash. (CVE-2011-2692)

Users of libpng should upgrade to these updated packages, which upgrade
libpng to version 1.2.46 to correct these issues. All running 
applications using libpng must be restarted for the update to take effect.

SL6:
   i386
      libpng-1.2.46-1.el6_1.i686.rpm
      libpng-debuginfo-1.2.46-1.el6_1.i686.rpm
      libpng-devel-1.2.46-1.el6_1.i686.rpm
      libpng-static-1.2.46-1.el6_1.i686.rpm
   x86_64
      libpng-devel-1.2.46-1.el6_1.x86_64.rpm
      libpng-devel-1.2.46-1.el6_1.i686.rpm
      libpng-debuginfo-1.2.46-1.el6_1.x86_64.rpm
      libpng-debuginfo-1.2.46-1.el6_1.i686.rpm
      libpng-1.2.46-1.el6_1.x86_64.rpm
      libpng-1.2.46-1.el6_1.i686.rpm
      libpng-static-1.2.46-1.el6_1.x86_64.rpm

- Scientific Linux Development Team