CVE-2006-0718 in Vsu 7500
Summary
by MITRE
The Internet Key Exchange version 1 (IKEv1) implementation in Avaya VSU 100, 2000, 7500, 10000, and CSU 5000, when running IPSec, allows remote attackers to cause a denial of service (crash) via certain IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1. NOTE: due to the lack of details in the advisory, it is unclear which of CVE-2005-3666, CVE-2005-3667, and/or CVE-2005-3668 this issue applies to.
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Analysis
by VulDB Data Team • 07/22/2024
The vulnerability described in CVE-2006-0718 represents a critical denial of service weakness within the Internet Key Exchange version 1 implementation of Avaya's VSU and CSU security appliances. This flaw specifically affects Avaya VSU 100, 2000, 7500, 10000, and CSU 5000 devices operating in IPSec mode, making them susceptible to remote exploitation by malicious actors who can craft specially formatted IKE packets to trigger system crashes. The vulnerability manifests through the processing of certain IKE packets that contain malformed or unexpected data structures within the ISAKMP framework, which is the protocol underlying IPSec key exchange operations. The issue was demonstrated using the PROTOS ISAKMP Test Suite for IKEv1, indicating that the attack vector involves specific packet construction patterns that exploit implementation gaps in the IKEv1 protocol handling.
This vulnerability operates at the network protocol level and specifically targets the IKEv1 implementation within Avaya's security appliances, creating a condition where legitimate network traffic can be used to disrupt service availability. The technical flaw lies in the insufficient input validation and error handling mechanisms within the IKE packet processing code, where certain packet structures cause the system to enter an unrecoverable state leading to complete system crash. The vulnerability's classification aligns with CWE-121, which describes heap-based buffer overflow conditions, and potentially CWE-122 for stack-based buffer overflows, as these are common causes of such denial of service conditions in protocol implementations. The attack requires minimal privileges and can be executed remotely, making it particularly dangerous for network infrastructure devices that are typically accessible from external networks.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network security infrastructure integrity. When exploited, the vulnerability can cause complete system crashes of Avaya security appliances, leading to extended downtime and potential loss of network security capabilities. Network administrators may experience difficulty in maintaining secure communications as the affected devices become unavailable, potentially creating windows of vulnerability in the network security posture. The attack's remote nature means that adversaries can target these systems from outside the network perimeter, making them particularly attractive targets for attackers seeking to disrupt business operations or create opportunities for further exploitation. This vulnerability directly impacts the availability component of the CIA triad and represents a significant concern for organizations relying on Avaya's security appliances for network protection.
Mitigation strategies for this vulnerability should focus on immediate patching of affected systems, network segmentation to limit exposure, and implementing monitoring solutions to detect anomalous IKE traffic patterns. Organizations should prioritize updating their Avaya VSU and CSU devices to versions that contain fixes for the IKEv1 implementation issues, as the vulnerability affects multiple generations of the affected product line. Network administrators should implement access control lists and firewall rules to limit IKE traffic to trusted sources only, reducing the attack surface for this specific vulnerability. Additionally, continuous monitoring of network traffic for suspicious IKE packet patterns can help detect exploitation attempts before they succeed in causing service disruption. The vulnerability's classification under the ATT&CK framework would place it within the T1499 category for Network Denial of Service, and potentially T1071 for application layer protocols, emphasizing the need for comprehensive network security monitoring and incident response procedures to address such threats effectively.