GLSA 200403-06: Multiple remote buffer overflow vulnerabilities in Courier

http://security.gentoo.org/

Severity:	normal
Title:	Multiple remote buffer overflow vulnerabilities in Courier
Date:	03/26/2004
Bugs:	#45584
ID:	200403-06

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.

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	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

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

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200403-06.xml

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 https://bugs.gentoo.org.