CVE-2014-3328 in Unified Presence Server
Summary
by MITRE
The Intercluster Sync Agent Service in Cisco Unified Presence Server allows remote attackers to cause a denial of service via a TCP SYN flood, aka Bug ID CSCun34125.
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Analysis
by VulDB Data Team • 03/26/2022
The vulnerability identified as CVE-2014-3328 affects the Intercluster Sync Agent Service within Cisco Unified Presence Server, representing a significant security weakness that can be exploited to disrupt critical communication infrastructure. This service is responsible for maintaining synchronization between different Cisco Unified Presence clusters, making it a crucial component for enterprise communication systems. The vulnerability manifests as a susceptibility to TCP SYN flood attacks, which can effectively overwhelm the service and render it unavailable to legitimate users. The bug was catalogued under Cisco bug ID CSCun34125, indicating its recognition within the vendor's internal tracking systems. This type of vulnerability particularly impacts organizations that rely heavily on unified communication services, where presence information synchronization is essential for collaborative work environments.
The technical flaw lies in the insufficient handling of TCP connection requests within the Intercluster Sync Agent Service implementation. When subjected to a TCP SYN flood attack, the service fails to properly manage the connection establishment process, leading to resource exhaustion and eventual service unavailability. The attack exploits the normal TCP three-way handshake mechanism by sending a large volume of SYN requests without completing the handshake, causing the target service to maintain incomplete connection states indefinitely. This creates a resource depletion scenario where system memory and connection tracking tables become overwhelmed, preventing legitimate connection attempts from being processed. The vulnerability demonstrates poor input validation and connection state management practices, which aligns with CWE-400, specifically addressing unchecked resource consumption. The service architecture does not implement adequate rate limiting or connection throttling mechanisms to distinguish between legitimate and malicious traffic patterns.
The operational impact of this vulnerability extends beyond simple service disruption, potentially affecting enterprise communication workflows and collaboration capabilities across distributed networks. Organizations utilizing Cisco Unified Presence Server for inter-cluster synchronization may experience significant downtime during exploitation, affecting presence information updates, user availability status propagation, and overall communication reliability. The denial of service condition can cascade through interconnected systems, as presence information is often critical for other services such as instant messaging, video conferencing, and unified contact management. Attackers can leverage this vulnerability to perform prolonged disruption campaigns without requiring elevated privileges or specialized access, making it particularly dangerous for organizations with limited network security monitoring capabilities. The impact is especially severe in environments where presence synchronization is critical for business operations, such as healthcare facilities, financial institutions, or manufacturing plants where real-time communication coordination is essential.
Mitigation strategies for CVE-2014-3328 should focus on implementing network-level protections and service hardening measures to prevent exploitation. Organizations should deploy rate limiting mechanisms at network boundaries to restrict the number of SYN requests per second to the affected service ports, effectively preventing resource exhaustion attacks. Network security appliances should be configured with SYN cookies or similar mechanisms to handle TCP handshake requests more efficiently without maintaining connection state information. Cisco recommends applying the latest security patches and firmware updates to address the vulnerability at the source, which typically include enhanced connection handling and resource management improvements. Additionally, implementing intrusion detection systems with signature-based detection for TCP SYN flood patterns can provide early warning of potential attacks. The mitigation approach should also consider deploying firewalls with stateful inspection capabilities that can identify and block malicious connection attempts while allowing legitimate traffic through. Organizations should conduct regular vulnerability assessments and penetration testing to identify similar weaknesses in their communication infrastructure, as this vulnerability represents a broader class of resource exhaustion attacks that may affect other services within the unified communication ecosystem.