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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk Web-Voicemail Discloses Voicemail Messages to Remote Authenticated Users
SecurityTracker Alert ID:  1015164
SecurityTracker URL:  http://securitytracker.com/id/1015164
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 8 2005
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.9 and prior versions
Description:   A vulnerability was reported in Asterisk in the Web-Voicemail feature. A remote authenticated user can access voicemail messages of other users.

The 'vmail.cgi' script does not properly validate user-supplied input. A remote authenticated user can supply a specially crafted URL to download WAV files from the target system.

A demonstration exploit URL to retrieve 'msg0001.wav' from the '/var/spool/asterisk/voicemail/default/201/INBOX/' directory is provided:

http://[target]/cgi-bin/vmail.cgi?action=audio& \
folder=../201/INBOX&mailbox=200&context=default&password=12345 \
&msgid=0001&format=wav

The vendor was notified on October 18, 2005.

Adam Pointon of Assurance.com.au discovered this vulnerability.

The original advisory is available at:

http://www.assurance.com.au/advisories/200511-asterisk.txt

Impact:   A remote authenticated user can access WAV files from the target PBX system, including voicemail messages of other users.
Solution:   The vendor has issued a fixed version (1.2.0-beta2).
Vendor URL:  www.asterisk.org/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


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