CVE-2012-2486 in Telepresence System Software
Summary
by MITRE
The Cisco Discovery Protocol (CDP) implementation on Cisco TelePresence Multipoint Switch before 1.9.0, Cisco TelePresence Immersive Endpoint Devices before 1.9.1, Cisco TelePresence Manager before 1.9.0, and Cisco TelePresence Recording Server before 1.8.1 allows remote attackers to execute arbitrary code by leveraging certain adjacency and sending a malformed CDP packet, aka Bug IDs CSCtz40953, CSCtz40947, CSCtz40965, and CSCtz40953.
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Analysis
by VulDB Data Team • 12/06/2021
The vulnerability described in CVE-2012-2486 represents a critical remote code execution flaw within Cisco's TelePresence ecosystem, specifically targeting the Cisco Discovery Protocol implementation across multiple network devices. This vulnerability affects a wide range of Cisco TelePresence products including multipoint switch devices, immersive endpoint devices, telepresence manager systems, and recording servers. The flaw exists in the way these devices process incoming CDP packets, creating an exploitable condition that can be leveraged by remote attackers without requiring authentication or physical access to the network. The vulnerability is particularly concerning because CDP is a Layer 2 protocol designed to aid network discovery and device identification, making it inherently part of normal network operations and difficult to monitor or restrict effectively.
The technical root cause of this vulnerability stems from inadequate input validation within the CDP packet processing logic of affected Cisco TelePresence devices. When these devices receive malformed CDP packets, the implementation fails to properly sanitize or validate the packet structure, leading to potential buffer overflows or memory corruption conditions. This type of vulnerability maps directly to CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read errors. The attacker can craft malicious CDP packets that exploit these validation gaps, potentially causing the device to execute arbitrary code with the privileges of the affected process, typically running with elevated system permissions. The requirement for adjacency means that attackers must be within the same broadcast domain as the target device, but this limitation does not prevent exploitation since network reconnaissance and packet injection can be performed from within local network segments.
The operational impact of this vulnerability extends far beyond simple network disruption, as it provides attackers with complete control over affected TelePresence devices and potentially broader network access. Since these devices often serve as critical components in enterprise communication infrastructure, their compromise can lead to unauthorized access to sensitive video conferencing sessions, potential data exfiltration, and use as launching points for further network attacks. The vulnerability affects devices operating in both enterprise and government environments where TelePresence systems are deployed for critical communications, making the potential impact substantial. Attackers could leverage this vulnerability to establish persistent access, monitor communications, or use compromised devices as pivoting points to attack other network segments. The fact that this vulnerability affects multiple device types within the TelePresence ecosystem increases the attack surface and makes comprehensive mitigation more challenging for network administrators.
Mitigation strategies for CVE-2012-2486 should focus on both immediate remediation and long-term network security enhancements. The primary recommendation involves applying the latest firmware updates from Cisco, specifically targeting versions 1.9.0 for multipoint switches, 1.9.1 for immersive endpoints, 1.9.0 for telepresence managers, and 1.8.1 for recording servers. Organizations should also implement network segmentation to isolate TelePresence devices from critical network segments and consider disabling CDP on devices where it is not strictly required for network operations. Network monitoring solutions should be enhanced to detect unusual CDP traffic patterns that might indicate exploitation attempts, and the principle of least privilege should be applied to limit the functionality and access rights of affected devices. This vulnerability aligns with several ATT&CK techniques including T1046 for network service scanning and T1059 for command and scripting interpreter, highlighting the need for comprehensive network security monitoring and incident response capabilities. Additionally, network administrators should consider implementing network access controls and firewall rules to limit broadcast domain exposure and reduce the likelihood of successful exploitation attempts.