GLSA 200501-39: SquirrelMail: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	high
Title:	SquirrelMail: Multiple vulnerabilities
Date:	01/28/2005
Bugs:	#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	Vulnerable	Unaffected	Architecture(s)
mail-client/squirrelmail	<= 1.4.3a-r2	>= 1.4.4	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:

    # 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.

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200501-39.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.