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Home >> Browse Vulnerability Assessment Database >> Red Hat Local Security Checks >> RHSA-2005-584: zlib

Vulnerability Assessment Details

RHSA-2005-584: zlib

Vulnerability Assessment Summary
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 ( 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 :
Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Tenable Network Security

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