SquirrelMail: Encoded text XSS vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200411-25 / SquirrelMail
Release Date	November 17, 2004
Latest Revision	May 22, 2006: 02
Impact	low
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
mail-client/squirrelmail	< 1.4.3a-r2	>= 1.4.3a-r2	All supported architectures

Related bugreports: #70739

Synopsis

Squirrelmail fails to properly sanitize user input, which could lead to a compromise of webmail accounts.

2. Impact Information

Background

SquirrelMail is a webmail package written in PHP. It supports IMAP and SMTP, and can optionally be installed with SQL support.

Description

SquirrelMail fails to properly sanitize certain strings when decoding specially-crafted headers.

Impact

By enticing a user to read a specially-crafted e-mail, an attacker can execute arbitrary scripts running in the context of the victim's browser. This could lead to a compromise of the user's webmail account, cookie theft, etc.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All SquirrelMail users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-client/squirrelmail-1.4.3a-r2"

Note: Users with the vhosts USE flag set should manually use webapp-config to finalize the update.

4. References

Updated November 17, 2004

Summary: This is a Gentoo Linux Security Advisory

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