#############################################################

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

#############################################################

Product: Telephony Server

Vendor: Nortel

Subject: Telephony Server Denial of Service

Risk: High

Effect: Currently exploitable

Author: Cyrill Brunschwiler (cyrill.brunschwiler (at) csnc (dot) ch

Date: October, 18th 2007

#############################################################

Introduction:

A malicious user who can send a flood of packets to specific E-LAN ports on the Telephony Server is
able to crash the telephony application. The server needs to be rebooted to resume normal operation.

Nortel has noted this as:
Title: Potential CS1000 DoS Vulnerability
Number: 2007008384
http://support.nortel.com/go/main.jsp?cscat=SECUREADVISORY

Vulnerable:

Communication Server 1000
and others.

See associated products on the Nortel advisory.

Vulnerability Management:

June 2007: Vulnerability found
June 2007: Nortel Security notified
October 2007: Nortel Advisory available
October 2007: Compass Security Information

Remediation:

Follow the recommended actions for the affected systems, as identified in the Nortel Advisory.

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