Courier: Cross-site scripting vulnerability in SqWebMail
Gentoo Linux Security Advisory
||GLSA 200408-02 / Courier
||August 04, 2004
||August 04, 2004: 01
All supported architectures
The SqWebMail web application, included in the Courier suite, is vulnerable
to cross-site scripting attacks.
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.
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.
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.
There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version of Courier.
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"