FLSA-2005:2043: Updated zlib package fixes security issues
Posted on: 02/24/2005 04:12 AM

An updated zlib package has been released for Fedora Core 1

Fedora Legacy Update Advisory

Synopsis: Updated zlib package fixes security issues
Advisory ID: FLSA:2043
Issue date: 2005-02-23
Product: Fedora Core
Keywords: Bugfix
Cross references: https://bugzilla.fedora.us/show_bug.cgi?id
CVE Names: CAN-2004-0797

1. Topic:

An updated zlib package that fixes a security flaw is now available.

Zlib is a general-purpose, patent-free, lossless data compression library which is used by many different programs.

2. Relevant releases/architectures:

Fedora Core 1 - i386

3. Problem description:

Johan Thelmen reported that a specially crafted file can cause a segmentation fault in zlib as the inflate() and inflateBack() functions do not properly handle errors. An attacker could construct a carefully crafted file that could cause a crash or possibly execute arbitrary code when opened. The specific impact depends on the application using zlib. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0797 to this issue.

Users of zlib are advised to upgrade to this errata package, which contains a backported patch correcting this issue.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs.

Please note that this update is also available via yum and apt. Many people find this an easier way to apply updates. To use yum issue:

yum update

or to use apt:

apt-get update; apt-get upgrade

This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. This assumes that you have yum or apt-get configured for obtaining Fedora Legacy content. Please visit http://www.fedoralegacy.org/docs for directions on how to configure yum and apt-get.

5. Bug IDs fixed:

http://bugzilla.fedora.us - bug #2043 - Zlib Compression Library Denial Of Service Vulnerability

6. RPMs required:

Fedora Core 1:



7. Verification:

SHA1 sum Package Name


These packages are GPG signed by Fedora Legacy for security. Our key is available from http://www.fedoralegacy.org/about/security.php

You can verify each package with the following command:

rpm --checksig -v lt;filenamegt;

If you only wish to verify that each package has not been corrupted or tampered with, examine only the sha1sum with the following command:

sha1sum lt;filenamegt;

8. References:


9. Contact:

The Fedora Legacy security contact is lt;secnotice@fedoralegacy.orggt;. More project details at http://www.fedoralegacy.org

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