[ GLSA 200705-24 ] libpng: Denial of Service

[GLSA]

Gentoo Linux Security Advisory

Title: libpng: Denial of Service (GLSA 200705-24)
Severity: normal
Exploitable: remote
Date: May 31, 2007
Bug(s): #178004
ID: 200705-24

Synopsis


A vulnerability 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: < 1.2.17
Unaffected: >= 1.2.17
Architectures: All supported architectures


Description


Mats Palmgren fixed an error in file pngrutil.c in which the trans[]
array might be not allocated because of images with a bad tRNS chunk
CRC value.


Impact


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


Workaround


There is no known workaround at this time.


Resolution


Please note that due to separate bugs in libpng 1.2.17, Gentoo does not
provide libpng-1.2.17 but libpng-1.2.18. All libpng users should
upgrade to the latest version: