Courier: Cross-site scripting vulnerability in SqWebMail

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200408-02 / Courier
Release Date	August 04, 2004
Latest Revision	August 04, 2004: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
mail-mta/courier	<= 0.45.6	>= 0.45.6.20040618	All supported architectures

Related bugreports: #58020

Synopsis

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

2. Impact Information

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.

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.

3. Resolution Information

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:

Code Listing 3.1: Resolution

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

4. References

Page updated August 04, 2004

Summary: This is a Gentoo Linux Security Advisory

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