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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
Check for the version of the zlib packages
Detailed Explanation for this Vulnerability Assessment
Updated zlib packages that fix a buffer overflow are now available for Red
Hat Enterprise Linux 4.
This update has been rated as having important security impact by the Red
Hat Security Response Team.
Zlib is a general-purpose lossless data compression library that is used
by many different programs.
A previous zlib update, RHSA-2005:569 (CVE-2005-2096) fixed a flaw in zlib
that could permit a carefully crafted compressed stream to crash an
application. While the original patch corrected the reported overflow,
Markus Oberhumer discovered additional ways a stream could trigger an
overflow. A possible hacker could create a carefully crafted compressed stream
that would cause an application to crash if the stream is opened by a user.
As an example, a possible hacker could create a malicious PNG image file that
would cause a Web browser or mail viewer to crash if the image is viewed.
The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned
the name CVE-2005-1849 to this issue.
Note that the versions of zlib shipped with Red Hat Enterprise
Linux 2.1 and 3 are not vulnerable to this issue.
All users should update to these errata packages that contain a patch
from Mark Adler that corrects this issue.
Solution : http://rhn.redhat.com/errata/RHSA-2005-584.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Tenable Network Security
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