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Gentoo Linux Security Advisory                           GLSA 200403-06
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                                             https://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 ]   [ 2 ] 
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/.