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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Detailed Explanation for this Vulnerability Assessment
Chris Evans discovered several vulnerabilities in libpng:
Multiple buffer overflows exist, including when
handling transparency chunk data, which could be exploited to cause
arbitrary code to be executed when a specially crafted PNG image is
Multiple NULL pointer dereferences in
png_handle_iCPP() and elsewhere could be exploited to cause an
application to crash when a specially crafted PNG image is processed
Multiple integer overflows in the png_handle_sPLT(),
png_read_png() functions and elsewhere could be exploited to cause an
application to crash, or potentially arbitrary code to be executed,
when a specially crafted PNG image is processed
In addition, a bug related to CVE-2002-1363 was fixed:
A buffer overflow could be caused by incorrect
calculation of buffer offsets, possibly leading to the execution of
For the current stable distribution (woody), these problems have been
fixed in libpng3 version 1.2.1-1.1.woody.7 and libpng version
For the unstable distribution (sid), these problems will be fixed soon.
We recommend that you update your libpng and libpng3 packages.
Solution : http://www.debian.org/security/2004/dsa-536
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2005 Michel Arboi
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