[SecuriWeb 2006.1] directory traversal in Asterisk@Home and ARI

[François Harvey <fharvey () securiweb net>]

ID     :              2006.1
Product :          ARI (Asterisk Recording Interface)
                       http://www.littlejohnconsulting.com/?q=node/11
                       Asterisk@home Distribution
                       http://asteriskathome.sourceforge.net/
Affected product : <= 0.7.15 (Asterisk@Home 2.6 and lower)
Class :              Access to protected information, directory traversal
Remote :          yes
Author :           Francois Harvey <fharvey at securiweb dot net>
Published date :   2006-04-20 (Initial Vendor contact 2006-03-06)
Reference URL :  
http://www.securiweb.net/wiki/Ressources/AvisDeSecurite/2006.1
Solution :         Use the last ARI version or use asterisk@home 2.8

Two vulnerabilities was found in the ARI package included in the  
asterisk@home Distribution. These vulnerabilities allow a user to listen 
voicemail from any other users and and to disclose configuration password.

Vulnerability 1
---------------

The config file is in a public directory and not protected by default

Exploit : http://<asterisk>/recordings/includes/main.conf

This should list all the configuration of ARI. With asterisk password, 
db password, admin password.

Vulnerability 2
---------------

A directory traversal/file retreival exist in the ARI web interface.
This script allow a user to download any mp3/wav/gsm on the system. No 
authentification is needed, this can be used to listen voicemail from 
another user.

Exploit : 
http://<asterisk>/recordings/misc/audio.php?recording=/var/spool/asterisk/voicemail/default/<mailbox>/INBOX/msg<messageid>.wav

This flaw can also be used to verify the presence of a file on the server
Cannot use file: xxx <-- file exist bot not the good extension
404 File not found! <--- file doesn't exist

Patch
------
Both asterisk@home and ARI released fixes

Author
-------
Francois Harvey <fharvey at securiweb dot net>
SecuriWeb inc | www.securiweb.net