Nortel Communication Server UNIStim sequence numbers session hijacking
| nortel-unistim-session-hijacking (41801) |  Medium 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
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 the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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.