Multiple remote buffer overflow vulnerabilities in Courier

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200403-06 / Courier
Release Date	March 26, 2004
Latest Revision	March 26, 2004: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-mail/courier-imap	< 3.0.0	>= 3.0.0	All supported architectures
mail-mta/courier	< 0.45	>= 0.45	All supported architectures

Related bugreports: #45584

Synopsis

Remote buffer overflow vulnerabilities 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.

2. Impact Information

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.

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.

3. Resolution Information

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 current versions of the affected packages:

Code Listing 3.1: Resolution

# 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 ">=mail-mta/courier-0.45"
# emerge ">=mail-mta/courier-0.45"

4. References

Page updated March 26, 2004

Summary: This is a Gentoo Linux Security Advisory

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