[ GLSA 200711-08 ] libpng: Multiple Denials of Service

[GLSA]

Gentoo Linux Security Advisory

Title: libpng: Multiple Denials of Service (GLSA 200711-08)
Severity: normal
Exploitable: remote
Date: November 07, 2007
Bug(s): #195261
ID: 200711-08

Synopsis


Several vulnerabilities in libpng may allow a remote attacker to crash
applications that handle untrusted images.


Background


libpng is a free ANSI C library used to process and manipulate PNG
images.


Affected Packages

Package: media-libs/libpng
Vulnerable: < 1.2.21-r3
Unaffected: >= 1.2.21-r3
Architectures: All supported architectures


Description


An off-by-one error when handling ICC profile chunks in the
png_set_iCCP() function was discovered (CVE-2007-5266). George Cook and
Jeff Phillips reported several errors in pngrtran.c, the use of logical
instead of a bitwise functions and incorrect comparisons
(CVE-2007-5268). Tavis Ormandy reported out-of-bounds read errors in
several PNG chunk handling functions (CVE-2007-5269).


Impact


A remote attacker could craft an image that when processed or viewed by
an application using libpng would cause the application to terminate
abnormally.


Workaround


There is no known workaround at this time.


Resolution


All libpng users should upgrade to the latest version: