CVE-2011-3318 in Video Surveillance Software
Summary
by MITRE
Cisco Video Surveillance 2421 and 2500 series cameras with software 1.1.x and 2.x before 2.4.0 and Video Surveillance 2600 series cameras with software before 4.2.0-13 allow remote attackers to cause a denial of service (device reload) by sending crafted RTSP packets over TCP, aka Bug IDs CSCtj96312, CSCtj39462, and CSCtl80175.
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Analysis
by VulDB Data Team • 11/24/2021
Cisco Video Surveillance 2421 and 2500 series cameras operating with software versions 1.1.x and 2.x prior to 2.4.0, along with 2600 series cameras running software versions before 4.2.0-13, contain a critical vulnerability that enables remote attackers to induce a denial of service condition through the manipulation of RTSP protocol packets transmitted over TCP connections. This vulnerability represents a significant security flaw in network video surveillance infrastructure, specifically targeting the real-time streaming protocol implementation within these devices. The flaw manifests when the cameras receive specially crafted RTSP packets that trigger an unexpected device reload, effectively causing service disruption and potential loss of video surveillance capabilities. This vulnerability falls under the CWE-121 category of buffer overflow conditions, where improper input validation leads to system instability and unauthorized service interruption. The attack vector requires only network access to the affected cameras, making it particularly dangerous as remote exploitation is possible without physical access or authentication credentials. The vulnerability impacts the availability aspect of the CIA triad by preventing legitimate users from accessing video feeds and system functionality during the device reload process, which can last several minutes depending on the camera model and network conditions. The specific bug identifiers CSCtj96312, CSCtj39462, and CSCtl80175 highlight the multiple manifestations of this issue across different product lines and software versions, indicating a systemic problem within the RTSP implementation rather than an isolated incident.
The technical exploitation of this vulnerability involves crafting RTSP packets that contain malformed or specially constructed parameters designed to trigger memory corruption or resource exhaustion within the camera's processing stack. When the affected cameras process these crafted packets, they fail to properly validate the incoming data and subsequently attempt to handle the malformed input in a way that causes the device to restart automatically. This behavior represents a classic denial of service attack pattern where legitimate service availability is compromised through the manipulation of protocol implementations. The vulnerability is particularly concerning because it affects multiple generations of Cisco video surveillance equipment and spans across different software version ranges, suggesting a fundamental flaw in the protocol handling logic rather than a simple coding error. The fact that this affects both 2421/2500 series and 2600 series cameras indicates that the underlying issue exists in the core RTSP processing components shared across these product families, making the attack surface significantly larger. Network-based attacks against these devices can be executed by any remote attacker who can establish TCP connections to the affected cameras, which typically operate on standard RTSP ports such as 554, making the exploitation relatively straightforward and accessible.
The operational impact of this vulnerability extends beyond simple service disruption, as it can compromise the integrity of video surveillance operations and potentially expose organizations to security risks through extended periods of system unavailability. During device reload cycles, surveillance footage becomes inaccessible, and monitoring capabilities are temporarily disabled, which can create security gaps in protected environments. Organizations relying on these cameras for critical security operations may experience significant operational disruption, particularly in scenarios where continuous monitoring is required for compliance or safety reasons. The vulnerability also creates opportunities for attackers to perform persistent denial of service attacks, where repeated exploitation can keep devices in a constant state of reloading, effectively rendering the surveillance system non-functional. This type of attack can be particularly damaging in industrial control systems or critical infrastructure environments where video monitoring is essential for security operations. The vulnerability's potential for causing cascading failures within larger surveillance networks is also significant, as multiple affected devices can create widespread service disruption across entire installations. From an attacker perspective, this vulnerability aligns with the ATT&CK technique T1499.004 for network denial of service, where adversaries leverage protocol implementation flaws to disrupt system availability. The attack can be automated and executed at scale, potentially affecting hundreds or thousands of devices within a single network segment, making it a particularly dangerous threat for organizations with large surveillance deployments.
Organizations should implement immediate mitigations including applying the vendor-provided security patches and firmware updates that address the RTSP processing flaws in affected software versions. Network segmentation and access control measures should be deployed to limit direct access to surveillance cameras from untrusted networks, particularly by implementing firewalls and access control lists that restrict TCP connections to RTSP ports. Monitoring network traffic for suspicious RTSP packet patterns can help detect exploitation attempts, while regular security assessments should be conducted to identify and remediate similar vulnerabilities in other networked devices. Device hardening practices including disabling unnecessary services and ports, implementing secure configuration baselines, and maintaining up-to-date security patches should be enforced across all surveillance equipment. Additionally, organizations should consider implementing intrusion detection systems specifically tuned to detect RTSP-based attack patterns and establish incident response procedures for handling device reload events that may indicate exploitation attempts. The vulnerability demonstrates the importance of secure software development practices and proper input validation in network protocols, particularly for devices that operate in untrusted network environments and require continuous availability for security operations.