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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
libpng denial of service vulnerability
Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200405-06
(libpng denial of service vulnerability)
libpng provides two functions (png_chunk_error and png_chunk_warning) for
default error and warning messages handling. These functions do not perform
proper bounds checking on the provided message, which is limited to 64
bytes. Programs linked against this library may crash when handling a
malicious PNG image.
This vulnerability could be used to crash various programs using the libpng
library, potentially resulting in a denial of service attack on vulnerable
There is no known workaround at this time. All users are advised to upgrade
to the latest available version of libpng.
All users of libpng should upgrade to the latest stable version:
# emerge sync
# emerge -pv ">=media-libs/libpng-1.2.5-r5"
# emerge ">=media-libs/libpng-1.2.5-r5"
You should also run revdep-rebuild to rebuild any packages that depend on
older versions of libpng :
Network Security Threat Level: Medium
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2005 Michel Arboi
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