CVE-2018-3852 in Ocularis
Summary
by MITRE
An exploitable denial of service vulnerability exists in the Ocularis Recorder functionality of Ocularis 5.5.0.242. A specially crafted TCP packet can cause a process to terminate resulting in denial of service. An attacker can send a crafted TCP packet to trigger this vulnerability.
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Analysis
by VulDB Data Team • 02/15/2020
The vulnerability identified as CVE-2018-3852 represents a critical denial of service weakness within the Ocularis Recorder component of Ocularis 5.5.0.242 video surveillance software. This flaw manifests specifically within the network protocol handling mechanisms that process incoming TCP connections, creating a scenario where legitimate system operations can be disrupted through carefully constructed malicious traffic. The vulnerability resides in the software's inability to properly validate and handle certain TCP packet structures, leading to unexpected process termination and subsequent service disruption.
The technical implementation of this vulnerability stems from insufficient input validation within the TCP packet processing pipeline of the Ocularis Recorder module. When the system receives a specially crafted TCP packet that exploits malformed header structures or unexpected sequence numbers, the underlying process handling these connections fails to maintain proper execution flow. This processing failure results in an abrupt termination of the recorder service process, effectively denying legitimate users access to the video surveillance functionality. The vulnerability operates at the network protocol layer, making it particularly dangerous as it can be exploited remotely without requiring authentication or specialized local access privileges.
From an operational impact perspective, this vulnerability creates significant security and business continuity concerns for organizations relying on Ocularis surveillance systems. The denial of service condition directly affects video recording capabilities and real-time monitoring functions, potentially leaving critical facilities vulnerable to security incidents during the service interruption period. The remote exploitability means that adversaries can trigger this condition from outside the network perimeter, making it particularly attractive for attackers seeking to disrupt security operations. Organizations may experience extended downtime while system administrators investigate and remediate the issue, potentially compromising their overall security posture and operational readiness.
Security professionals should approach this vulnerability through multiple mitigation strategies aligned with established frameworks such as the CWE taxonomy, where this weakness maps to CWE-129 Input Validation and CWE-20 Improper Input Validation. The ATT&CK framework categorizes this as a Denial of Service technique under the T1499 sub-technique, specifically targeting network services and system availability. Recommended remediation measures include implementing network segmentation to isolate critical surveillance systems, deploying intrusion detection systems to monitor for suspicious TCP traffic patterns, and applying vendor-provided patches or updates as soon as they become available. Organizations should also consider implementing process monitoring to detect unexpected service terminations and establish incident response procedures specifically addressing this type of vulnerability to minimize operational impact during exploitation attempts.