Nortel Communication Server UNIStim sequence numbers session hijacking

nortel-unistim-session-hijacking (41801) The risk level is classified as MediumMedium Risk

Description:

Nortel Communication Server is vulnerable to session hijacking, caused by an error in the handling of UNIStim protocol sequence numbers. By sniffing network traffic, a remote attacker could observe the sequence numbers and guess the valid number needed to issue new commands as a UNIStim client. An attacker could exploit this vulnerability this vulnerability to possibly hijack a session.

*CVSS:

Base Score: 6.8
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Refer to NORTEL BULLETIN ID: 2008008764, Rev 1 for patch, upgrade or suggested workaround information. See References.

References:

  • NORTEL BULLETIN ID: 2008008764, Rev 1: Nortel: Technical Support: Nortel response to VoIP potential security vulnerabilities in CS 1000.
  • VoIP Security Advisory: Nortel UNIStim IT Sequence Number Intercept.
  • BID-28691: Nortel Networks Communication Server 1000 Multiple Security Vulnerabilities
  • CVE-2008-6564: Nortel UNIStim protocol, as used in Communication Server 1000 and other products, uses predictable sequence numbers, which allows remote attackers to hijack sessions via sniffing or brute force attacks.
  • OSVDB ID: 44379: Nortel Networks UNIStim Client Sequence Number Disclosure Weakness
  • SA29747: Nortel Networks Communication Server Multiple Vulnerabilities
  • SECTRACK ID: 1019847: Nortel IP Phones Predictable UNIStim Sequence Numbers Facilitate Hijacking Attacks

Platforms Affected:

  • Nortel CS1000 4.5

Reported:

Apr 10, 2008

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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