[ GLSA 200403-06 ] Multiple remote buffer overflow vulnerabi

[pahud]

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Gentoo Linux Security Advisory GLSA 200403-06
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http://security.gentoo.org
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Severity: Normal
Title: Multiple remote buffer overflow vulnerabilities in Courier
Date: March 26, 2004
Bugs: #45584
ID: 200403-06

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Synopsis
========

Remote buffer overflow vulnerabilites have been found in Courier-IMAP
and Courier MTA. These exploits may allow the execution of abritrary
code, allowing unauthorized access to a vulnerable system.

Background
==========

Courier MTA is a multiprotocol mail server suite that provides webmail,
mailing lists, IMAP, and POP3 services. Courier-IMAP is a standalone
server that gives IMAP access to local mailboxes.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
net-mail/courier-imap < 3.0.0 >= 3.0.0
net-mail/courier < 0.45 >= 0.45

Description
===========

The vulnerabilities have been found in the 'SHIFT_JIS' converter in
'shiftjis.c' and 'ISO2022JP' converter in 'so2022jp.c'. An attacker may
supply Unicode characters that exceed BMP (Basic Multilingual Plane)
range, causing an overflow.

Impact
======

An attacker without privileges may exploit this vulnerability remotely,
allowing arbitrary code to be executed in order to gain unauthorized
access.

Workaround
==========

While a workaround is not currently known for this issue, all users are
advised to upgrade to the latest version of the affected packages.

Resolution
==========

All users should upgrade to the current version of the affected
packages:

# emerge sync

# emerge -pv ">=net-mail/courier-imap-3.0.0"
# emerge ">=net-mail/courier-imap-3.0.0"

# ** Or; depending on your installation... **

# emerge -pv ">=net-mail/courier-0.45"
# emerge ">=net-mail/courier-0.45"

References
==========

[ 1 ] http://www.securityfocus.com/bid/9845
[ 2 ] http://www.cve.mitre.org/cgi-bin/cvenam ... -2004-0224

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.