[ GLSA 200501-39 ] SquirrelMail: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: SquirrelMail: Multiple vulnerabilities (GLSA 200501-39)
Severity: high
Exploitable: remote
Date: January 28, 2005
Bug(s): #78116
ID: 200501-39

Synopsis

SquirrelMail fails to properly sanitize user input, which could lead to arbitrary code execution and compromise webmail accounts.

Background

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

Affected Packages

Package: mail-client/squirrelmail
Vulnerable: <= 1.4.3a-r2
Unaffected: >= 1.4.4
Architectures: All supported architectures


Description

SquirrelMail fails to properly sanitize certain strings when decoding specially-crafted strings, which can lead to PHP file inclusion and XSS.

• Insufficient checking of incoming URLs in prefs.php (CAN-2005-0075) and in webmail.php (CAN-2005-0103).
• Insufficient escaping of integers in webmail.php (CAN-2005-0104).

Impact

By sending a specially-crafted URL, an attacker can execute arbitrary code from the local system with the permissions of the web server. Furthermore by enticing a user to load a specially-crafted URL, it is possible to display arbitrary remote web pages in Squirrelmail's frameset and 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.

Workaround

The arbitrary code execution is only possible with "register_globals" set to "On". Gentoo ships PHP with "register_globals" set to "Off" by default. There are no known workarounds for the other issues at this time.

Resolution

All SquirrelMail users should upgrade to the latest version: