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libpng: Multiple Denials of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200711-08 / libpng
Release Date November 07, 2007
Latest Revision November 07, 2007: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
media-libs/libpng < 1.2.21-r3 >= 1.2.21-r3 All supported architectures

Related bugreports: #195261


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

2.  Impact Information


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


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).


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

3.  Resolution Information


There is no known workaround at this time.


All libpng users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.21-r3"

4.  References


Page updated November 07, 2007

Summary: This is a Gentoo Linux Security Advisory

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