RHSA-2002:261 - Security Advisory

Topic

The Canna server, used for Japanese character input, has two security
vulnerabilities including an exploitable buffer overflow that allows a local
user to gain 'bin' user privileges. Updated packages for Red Hat Linux
Advanced Server are available.

[Updated 13 Jan 2003]
Added fixed packages for the Itanium (IA64) architecture.

[Updated 06 Feb 2003]
Added fixed packages for Advanced Workstation 2.1

Description

Canna is a kana-kanji conversion server which is necessary for Japanese
language character input.

A buffer overflow bug in the Canna server up to and including version 3.5b2
allows a local user to gain the privileges of the user 'bin' which can
lead to further exploits. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2002-1158 to this issue.

In addition, it was discovered that request validation was lacking in Canna
server versions 3.6 and earlier. A malicious remote user could exploit this
vulnerability to leak information or cause a denial of service attack.
(CAN-2002-1159)

Red Hat Linux Advanced Server ships with a Canna package vulnerable
to these issues; however, the package is normally only installed when
Japanese language support is selected during installation.

All users of Canna are advised to upgrade to these errata packages which
contain a backported security fix and are not vulnerable to this issue.

Red Hat would like to thank hsj and AIDA Shinra for the responsible
disclosure of these issues.

Solution

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

Please note that this update is available via Red Hat Network. To use Red
Hat Network, launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Affected Products

• Red Hat Enterprise Linux Server 2 ia64
• Red Hat Enterprise Linux Workstation 2 ia64

Fixes

• BZ - 78108 - AS2.1: Canna vulnerabilities

CVEs

• CVE-2002-1159
• CVE-2002-1158

References

(none)