[ GLSA 201408-06 ] libpng: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: libpng: Multiple vulnerabilities (GLSA 201408-06)
Severity: normal
Exploitable: remote
Date: August 14, 2014
Bug(s): #503014, #507378
ID: 201408-06

Synopsis

Multiple vulnerabilities have been discovered in libpng which can
allow a remote attacker to 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: < 1.6.10
Unaffected: >= 1.6.10
Unaffected: < 1.3
Unaffected: >= 1.5.18 < 1.5.19
Architectures: All supported architectures


Description

The png_push_read_chunk function in pngpread.c in the progressive
decoder enters an infinite loop, when it encounters a zero-length IDAT
chunk. In addition certain integer overflows have been detected and
corrected.
The 1.2 branch is not affected by these vulnerabilities.

Impact

A remote attacker could entice a user to open a specially crafted PNG
file using an application linked against libpng, possibly resulting in
Denial of Service.


Workaround

There is no known workaround at this time.

Resolution

All libpng users should upgrade to the latest version: