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Gentoo Linux Security Advisory                           GLSA 200408-02
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: Courier: Cross-site scripting vulnerability in SqWebMail
      Date: August 04, 2004
      Bugs: #58020
        ID: 200408-02

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Synopsis
=======
The SqWebMail web application, included in the Courier suite, is
vulnerable to cross-site scripting attacks.

Background
=========
Courier is an integrated mail and groupware server based on open
protocols. It provides ESMTP, IMAP, POP3, webmail, and mailing list
services within a single framework. The webmail functionality included
in Courier called SqWebMail allows you to access mailboxes from a web
browser.

Affected packages
================
    -------------------------------------------------------------------
     Package           /   Vulnerable   /                  Unaffected
    -------------------------------------------------------------------
  1  mail-mta/courier       <= 0.45.6              >= 0.45.6.20040618

Description
==========
Luca Legato found that SqWebMail is vulnerable to a cross-site
scripting (XSS) attack. An XSS attack allows an attacker to insert
malicious code into a web-based application. SqWebMail doesn't filter
appropriately data coming from message headers before displaying them.

Impact
=====
By sending a carefully crafted message, an attacker can inject and
execute script code in the victim's browser window. This allows to
modify the behaviour of the SqWebMail application, and/or leak session
information such as cookies to the attacker.

Workaround
=========
There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version of Courier.

Resolution
=========
All Courier users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=mail-mta/courier-0.45.6.20040618"
    # emerge ">=mail-mta/courier-0.45.6.20040618"

References
=========
  [ 1 ] CAN-2004-0591
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0591
  [ 2 ] XSS definition
        https://insights.sei.cmu.edu/library/2000-cert-advisories/

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

    https://security.gentoo.org/glsa/200408-02

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/.

License
======
Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/1.0/

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