CVE-2008-2218 in Multimedia Communications Server
Summary
by MITRE
Buffer overflow in the Multimedia PC Client in Nortel Multimedia Communication Server (MCS) before Maintenance Release 3.5.8.3 and 4.0.25.3 allows remote attackers to cause a denial of service (crash) via a flood of "extraneous" messages, as demonstrated by the Nessus "Generic flood" denial of service plugin.
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Analysis
by VulDB Data Team • 11/14/2017
The vulnerability identified as CVE-2008-2218 represents a critical buffer overflow condition within the Multimedia PC Client component of Nortel Multimedia Communication Server (MCS) systems. This flaw exists in versions prior to Maintenance Release 3.5.8.3 and 4.0.25.3, making a substantial portion of deployed Nortel MCS installations susceptible to exploitation. The buffer overflow occurs when the system processes incoming network messages, specifically targeting the handling of "extraneous" messages that are not part of normal communication protocols. This vulnerability falls under the CWE-121 category of buffer overflow conditions, which is classified as a fundamental software security weakness that has been consistently documented in the Common Weakness Enumeration catalog.
The technical exploitation of this vulnerability involves sending a flood of specially crafted messages to the affected Multimedia PC Client, which triggers the buffer overflow condition in the application's memory management routines. When the client receives these extraneous messages, it fails to properly validate the message length or content before processing them, leading to memory corruption that ultimately causes the application to crash or become unresponsive. The Nessus "Generic flood" denial of service plugin demonstrates how this vulnerability can be systematically exploited by attackers to disrupt service availability, as the flood of messages overwhelms the client's ability to handle legitimate traffic while simultaneously corrupting memory structures. This type of attack aligns with ATT&CK technique T1498 which focuses on denial of service attacks through resource exhaustion and system instability.
The operational impact of CVE-2008-2218 extends beyond simple service disruption, as it can compromise the overall reliability and availability of communication services within organizations that rely on Nortel MCS infrastructure. When the Multimedia PC Client crashes, it can affect not only the specific endpoint but potentially disrupt communication pathways that depend on this client for multimedia services. The vulnerability is particularly concerning because it can be exploited remotely without requiring authentication, making it an attractive target for attackers seeking to cause disruption. Organizations using affected Nortel MCS versions face the risk of extended downtime, degraded service quality, and potential cascading failures that could impact business operations. The vulnerability's classification as a denial of service condition means that even a small number of attackers could potentially cause significant disruption to critical communication infrastructure, particularly in environments where multimedia services are essential for business operations.
The mitigation strategy for this vulnerability requires immediate implementation of the vendor-provided patches and maintenance releases that address the buffer overflow in the Multimedia PC Client component. Organizations should prioritize updating their Nortel MCS systems to Maintenance Release 3.5.8.3 or 4.0.25.3, depending on their current version, to eliminate the risk of exploitation. Network administrators should also implement monitoring and intrusion detection systems to identify unusual message flooding patterns that could indicate exploitation attempts. Additionally, implementing network segmentation and access controls can help limit the potential impact of such attacks by reducing the attack surface and preventing unauthorized access to critical communication infrastructure. The vulnerability underscores the importance of maintaining up-to-date security patches and implementing proper input validation mechanisms to prevent buffer overflow conditions in networked applications.