Nortel IP Phone UNIStim packet spoofing denial of service
| nortel-ipphone-spoof-dos (37253) |  Low Risk |
Description:
Multiple Nortel IP Phones are vulnerable to a denial of service attack, caused by improper handling of spoofed packets. By flooding a vulnerable device with valid UNIStim messages containing a spoofed server source address, a remote attacker could cause the device to become unresponsive. The device must be rebooted to regain normal functionality.
Platforms Affected:
- Nortel, Business Communications Manager 1000
- Nortel, Business Communications Manager 200
- Nortel, Business Communications Manager 400
- Nortel, Business Communications Manager 50
- Nortel, Business Communications Manager 50a
- Nortel, Business Communications Manager 50e
- Nortel, Business Communications Manager SRG200
- Nortel, Business Communications Manager SRG50
- Nortel, Centrex IP Client Manager
- Nortel, Centrex IP Element Manager
- Nortel, CS1000e
- Nortel, CS1000m
- Nortel, cs1000s
- Nortel, CS2100
- Nortel, IP Audio Conference Phone 2033
- Nortel, IP Phone 1110
- Nortel, IP Phone 1120E
- Nortel, IP Phone 1140E
- Nortel, IP Phone 1150E
- Nortel, IP Phone 2001
- Nortel, IP Phone 2002
- Nortel, IP Phone 2004
- Nortel, IP Phone 2007
- Nortel, Meridian Option 11C
- Nortel, Meridian Option 51C
- Nortel, Meridian Option 61C
- Nortel, Meridian Option 81C
- Nortel, Meridian SL100
- Nortel, Mobile Voice Client 2050
- Nortel, Multimedia Communication Server 5100
- Nortel, Multimedia Communication Server 5200
- Nortel, WLAN Handset 2210
- Nortel, WLAN Handset 2211
- Nortel, WLAN Handset 2212
- Nortel, WLAN Handset 6120
- Nortel, WLAN Handset 6140
Remedy:
Refer to Nortel Technical Support Security Advisory Bulletin 2007008386 for patch, upgrade, or suggested workaround information. See References.
Consequences:
Denial of Service
References:
- COMPASS SECURITY ADVISORY: October, 18th 2007, IP Phone Flooding Denial of Service at http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_flooding_denial_of_service_v1.0.txt.
- Nortel Technical Support Security Advisory Bulletin 2007008386, Potential DoS Vulnerability - IP Phone Freeze to Offline State at http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654715.
- BID-26122: Nortel IP Phones UNIStim Messages Denial of Service Vulnerability
- CVE-2007-5639: The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and other Nortel IP Phone, Mobile Voice Client, and WLAN Handsets products allow remote attackers to cause a denial of service (device hang) via a flood of Mute and UnMute messages that have a spoofed source IP address for the Signaling Server.
Reported:
Oct 17, 2007
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