Asterisk vmail.cgi vulnerability
Date: 11/07/05

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    Date: Mon, 7 Nov 2005 11:19:19 +1100
 - Vulnerability Advisory
    Release Date:

     Asterisk Web-VoiceMail (Comedian VoiceMail)

     Asterisk is a complete PBX in software. It runs on Linux, BSD and MacOSX and
     provides all of the features you would expect from a PBX and more.
     Asterisk does voice over IP in many protocols, and can interoperate with almost
     all standards-based telephony equipment using relatively inexpensive hardware.

    Versions affected:
     Asterisk Versions <= 1.0.9
     Asterisk Beta Versions <= 1.2.0-beta1
     Asterisk @ Home Versions <= 1.5
     Asterisk @ Home Beta Versions <= 2.0 Beta 4

    Vulnerability discovered:

     A vulnerability in the voicemail retrieval system allows an authenticated
     user to download any .wav/.WAV file from the system, including other
     users voicemail messages.

    Vulnerability impact:

     Low - Insecure web-ui causes breach of privacy

    Vulnerability information

     vmail.cgi doesn't clean a parameter passed by the web user which is
     later used to open a file and return a raw stream to the user.
     This allows any authenticated user of the voicemail system to listen to
     other peoples messages, or to open any file with the extension .wav/.WAV
     on the system.

     Example: \
      folder=../201/INBOX&mailbox=200&context=default&password=12345 \

     This will return /var/spool/asterisk/voicemail/default/201/INBOX/msg0001.wav
     when logged in as the 'extension 200' user.

     Asterisk has released patches for the vulnerabilities.
     Ensure you are running Asterisk versions > 1.0.9 / 1.2.0-beta1
     Ensure you are running Asterisk @ Home versions > 1.5 / 2.0 beta 4

    References: advisory

     Asterisk advisory note

     Adam Pointon of

    Disclosure timeline:
     17-Oct-2005 - Discovered during a quick audit of the asterisk web ui
     18-Oct-2005 - Email sent to support and the primary author
     18-Oct-2005 - Immediate response received
     31-Oct-2005 - Patched version committed to CVS
     07-Nov-2005 - Advisory released

    About us: is a specialised information security consultancy.
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     These include:
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      * ISO 15408 (Common Criteria), ITSEC, TCSEC
      * ISO 13569, ISO 11131
      * ACSI33, AS2805, AS3806, AS4360, AS4539, AS8018, HB231:2001, NPP4 (privacy)
      * Sarbanes-Oxley

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