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Category:   Application (E-mail Client)  >   SquirrelMail Vendors:   SquirrelMail Development Team
SquirrelMail Input Validation Flaw in 'Deliver_SendMail.class.php' Lets Remote Authenticated Users Execute Arbitrary Commands on the Target System
SecurityTracker Alert ID:  1038312
SecurityTracker URL:  http://securitytracker.com/id/1038312
CVE Reference:   CVE-2017-7692   (Links to External Site)
Updated:  Apr 27 2017
Original Entry Date:  Apr 19 2017
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.4.22; possibly earlier versions
Description:   A vulnerability was reported in SquirrelMail. A remote authenticated user can execute arbitrary commands on the target system.

The initStream() function in 'Deliver_SendMail.class.php' does not properly validate user-supplied input before making a popen() call. A remote authenticated user can upload a specially crafted sendmail configuration file and then cause the system to execute arbitrary shell commands.

The vendor was notified on April 4, 2017.

The original advisories and demonstration exploit code are available at:

https://www.wearesegment.com/research/Squirrelmail-Remote-Code-Execution.html

https://legalhackers.com/advisories/SquirrelMail-Exploit-Remote-Code-Exec-CVE-2017-7692-Vuln.html

Filippo Cavallarin of wearesegment.com and Dawid Golunski of legalhackers.com reported this vulnerability.

Impact:   A remote authenticated user can execute arbitrary shell commands on the target system.
Solution:   The vendor has issued a fix (1.4.23-svn snapshot squirrelmail-20170427_0200-SVN), available at:

http://squirrelmail.org/download.php

Vendor URL:  www.squirrelmail.org/security/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


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