National Cyber-Alert System

Vulnerability Summary for CVE-2007-5640

Overview

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), Mobile Voice Client, and other product lines, allow remote attackers to block calls and force re-registration via a resume message to the Signaling Server that has a spoofed source IP address for the phone. NOTE: the attack is more disruptive if a new spoofed resume message is sent after each re-registration.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: CONFIRM

Name: http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654641

Type: Patch Information

Hyperlink:http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654641

External Source: XF

Name: nortel-ipphone-register-dos(37254)

Hyperlink:http://xforce.iss.net/xforce/xfdb/37254

External Source: BID

Name: 26124

Hyperlink:http://www.securityfocus.com/bid/26124

External Source: BUGTRAQ

Name: 20071018 Nortel IP Phone forced re-authentication

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/482481/100/0/threaded

External Source: MISC

Name: http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_forced_re-authentication_v1.0.txt

Hyperlink:http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_forced_re-authentication_v1.0.txt

External Source: SECUNIA

Name: 27234

Type: Advisory

Hyperlink:http://secunia.com/advisories/27234

External Source: OSVDB

Name: 41772

Hyperlink:http://osvdb.org/41772

External Source: SREASON

Name: 3274

Hyperlink:http://securityreason.com/securityalert/3274