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

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

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