[ GLSA 200403-06 ] Multiple remote buffer overflow vulnerabilities in Courier

[Kurt Lieber <klieber () gentoo org>]

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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/cvename.cgi?name=CAN-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.

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