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Pngcrush: Buffer overflow


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200603-18 / pngcrush
Release Date March 21, 2006
Latest Revision March 21, 2006: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
media-gfx/pngcrush < 1.6.2 >= 1.6.2 All supported architectures

Related bugreports: #123286


Pngcrush is vulnerable to a buffer overflow which could potentially lead to the execution of arbitrary code.

2.  Impact Information


Pngcrush is an optimizer for PNG files.


Carsten Lohrke of Gentoo Linux reported that Pngcrush contains a vulnerable version of zlib (GLSA 200507-19).


By creating a specially crafted data stream, attackers can overwrite data structures for applications that use Pngcrush, resulting in a Denial of Service and potentially arbitrary code execution.

3.  Resolution Information


There is no known workaround at this time.


All Pngcrush users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-gfx/pngcrush-1.6.2"

4.  References


Page updated March 21, 2006

Summary: This is a Gentoo Linux Security Advisory

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