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9k Update 2005-02-01: Updated unarj

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PostPosted: Sat Mar 05, 2005 2:25 am    Post subject: 9k Update 2005-02-01: Updated unarj Reply with quote

Fedora Legacy Update Advisory

Synopsis: Updated unarj package fixes security issue
Advisory ID: FLSA:2272
Issue date: 2005-02-01
Product: Red Hat Linux, Fedora Core
Keywords: Bugfix
Cross references: https://bugzilla.fedora.us/show_bug.cgi?id=2272
CVE Names: CAN-2004-0947 CAN-2004-1027

1. Topic:

An updated unarj package that fixes a buffer overflow vulnerability and
a directory traversal vulnerability is now available.

The unarj program is an archiving utility which can extract
ARJ-compatible archives.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 9 - i386
Fedora Core 1 - i386

3. Problem description:

A buffer overflow bug was discovered in unarj when handling long file
names contained in an archive. An attacker could create a specially
crafted archive which could cause unarj to crash or possibly execute
arbitrary code when extracted by a victim. The Common Vulnerabilities
and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0947 to this issue.

Additionally, a path traversal vulnerability was discovered in unarj. An
attacker could create a specially crafted archive which would create
files in the parent (”..”) directory when extracted by a victim. When
used recursively, this vulnerability could be used to overwrite critical
system files and programs. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2004-1027 to this

Users of unarj should upgrade to this updated package which contains
backported patches and is not vulnerable to these issues.

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:

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 #2272 - unarj - buffer overflow and path
traversal bugs

6. RPMs required:

Red Hat Linux 9:



7. Verification:

SHA1 sum Package Name

a6151b99a058e254d76de4fe73b769fe0978f851 redhat/9/updates/i386/unarj-2.63a-
b88dc2c7dad960fdf9fe5392ef4715deca699287 redhat/9/updates/SRPMS/unarj-2.63a-

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

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


8. References:


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