SquirrelMail: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200501-39 / SquirrelMail
||January 28, 2005
||January 28, 2005: 01
All supported architectures
SquirrelMail fails to properly sanitize user input, which could lead to
arbitrary code execution and compromise webmail accounts.
SquirrelMail is a webmail package written in PHP. It supports IMAP
and SMTP and can optionally be installed with SQL support.
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
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.
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.
All SquirrelMail users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-client/squirrelmail-1.4.4"
Note: Users with the vhosts USE flag set should manually use
webapp-config to finalize the update.