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HistoryNov 20, 2007 - 12:00 a.m.

Alcatel OmniPCX Enterprise VoIP Vulnerability

2007-11-2000:00:00
vulners.com
29

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COMPASS SECURITY ADVISORY http://www.csnc.ch/

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Product: OmniPCX Enterprise

Vendor: Alcatel

Subject: VoIP Phone Audio Stream Rerouting Vulnerability

Risk High

Effect Currently exploitable

Author: Daniel Stirnimann (daniel.stirnimann (at) csnc (dot) ch)

Date: November, 19th 2007

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Introduction:

If a malicious user sends a TFTP request to the
signaling server with the MAC address of the
victimโ€™s VoIP phone as part of the file name, he
is able to reroute only the audio stream coming
from the other end of the call to his computers IP
address.
Even though an Alcatel VoIP phone can make or take
calls, and send audio, it is prevented from hearing anything said at the other end of the
communication. The VoIP phone needs to be rebooted
manually in order to work again.

This vulnerability may be further exploited by
rerouting the audio stream to the victimโ€™s VoIP
phone again. This would only allow the malicious
user to eavesdrop on half of the victim's audio
communication: what the victim says is not
intercepted, only on the answers made by the other
party would be overheard. Note, this scenario has
not been verified.

Vulnerable:

Alcatel OmniPCX Enterprise release 7.1 and earlier

Not vulnerable:

Alcatel OmniPCX Enterprise release 8.0

Vulnerability Management:

June 2007: Vulnerability found
June 2007: Alcatel Security notified
November 2007: Alcatel Advisory available
November 2007: Alcatel Security Information

Alcatel-Lucent information:

http://www1.alcatel-lucent.com/psirt/statements.htm
Number 2007004

Reference:
http://www.csnc.ch/static/advisory/secadvisorylist.html