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GLSA
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Joined: 12 May 2004
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PostPosted: Sun Feb 15, 2015 3:26 pm    Post subject: [ GLSA 201502-10 ] libpng Reply with quote

Gentoo Linux Security Advisory

Title: libpng: User-assisted execution of arbitrary code (GLSA 201502-10)
Severity: normal
Exploitable: local, remote
Date: February 15, 2015
Updated: June 06, 2015
Bug(s): #531264, #533358
ID: 201502-10

Synopsis

Two vulnerabilities have been found in libpng, possibly resulting
in execution of arbitrary code.


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: < 1.6.16
Unaffected: >= 1.6.16
Unaffected: >= 1.5.21 < 1.5.22
Unaffected: >= 1.2.52 < 1.2.53
Unaffected: >= 1.2.53 < 1.2.54
Unaffected: >= 1.2.54 < 1.2.55
Unaffected: >= 1.2.55 < 1.2.56
Unaffected: >= 1.2.56 < 1.2.57
Unaffected: >= 1.5.22 < 1.5.23
Unaffected: >= 1.5.23 < 1.5.24
Unaffected: >= 1.5.24 < 1.5.25
Unaffected: >= 1.5.25 < 1.5.26
Architectures: All supported architectures


Description

Two vulnerabilities have been discovered in libpng:
  • The png_user_version_check function contains an out-of-bounds memory
    access error (libpng 1.6.15 Release Notes)
  • The png_combine_row function contains an integer overflow error,
    which could result in a heap-based buffer overflow (CVE-2014-9495)


Impact

A context-dependent attacker could entice a user to open a specially
crafted PNG file using an application linked against libpng, possibly
resulting in execution of arbitrary code.


Workaround

There is no known workaround at this time.

Resolution

All libpng 1.6 users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.6.16"
   
All libpng 1.5 users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.21"
   


References

CVE-2014-9495

libpng 1.6.15 Release Notes


Last edited by GLSA on Thu Jun 18, 2015 4:16 am; edited 1 time in total
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