CVE-2020-24055 in 5620PTZ
Summary
by MITRE
Verint 5620PTZ Verint_FW_0_42 and Verint 4320 V4320_FW_0_23, and V4320_FW_0_31 units feature an autodiscovery service implemented in the binary executable '/usr/sbin/DM' that listens on port TCP 6666. The service is vulnerable to a stack buffer overflow. It is worth noting that this service does not require any authentication.
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Analysis
by VulDB Data Team • 08/22/2020
The vulnerability identified as CVE-2020-24055 affects Verint surveillance camera models including the 5620PTZ and 4320 series devices. These security flaws exist within the firmware versions Verint_FW_0_42, V4320_FW_0_23, and V4320_FW_0_31, representing a critical security weakness in networked video surveillance equipment. The affected devices implement an autodiscovery service that operates through the binary executable located at /usr/sbin/DM, which listens on TCP port 6666 for incoming connections. This service represents a fundamental design flaw that exposes the devices to remote exploitation without requiring any authentication credentials, making it particularly dangerous for networked security infrastructure.
The technical implementation of this vulnerability stems from a stack buffer overflow condition within the autodiscovery service running on the affected Verint devices. When the service processes incoming data on port 6666, it fails to properly validate input lengths, allowing attackers to overflow the allocated stack buffer space. This type of vulnerability maps directly to CWE-121 Stack-based Buffer Overflow, which occurs when a program writes data beyond the boundaries of a fixed-length buffer allocated on the stack. The absence of authentication requirements for the service means that any remote attacker can exploit this buffer overflow condition by simply connecting to the exposed TCP port 6666 and sending maliciously crafted data packets, potentially leading to arbitrary code execution or system compromise.
The operational impact of this vulnerability extends beyond simple network access, as it provides attackers with a pathway to gain unauthorized control over surveillance equipment that typically operates in sensitive environments. The exposed autodiscovery service on TCP port 6666 creates an attack surface that can be exploited by threat actors to compromise security camera systems, potentially leading to complete device takeover, data exfiltration, or disruption of surveillance operations. This vulnerability particularly affects organizations relying on Verint surveillance infrastructure for security monitoring, as it allows for remote exploitation without the need for valid credentials, making it an attractive target for attackers seeking to compromise security systems. The vulnerability also aligns with ATT&CK technique T1210 Exploitation of Remote Services, as it represents an unauthenticated remote service exploitation vector that can be leveraged for lateral movement or persistent access within network environments.
Mitigation strategies for this vulnerability should focus on immediate network segmentation and access control measures to prevent unauthorized access to the exposed TCP port 6666. Organizations should implement network firewalls to block external access to this port while maintaining internal access controls for legitimate administrative purposes. The most effective long-term solution involves applying firmware updates provided by Verint to patch the stack buffer overflow vulnerability in the DM binary executable. Additionally, security monitoring should be enhanced to detect unusual network traffic patterns on port 6666, and network administrators should consider disabling the autodiscovery service entirely if it is not required for operational purposes. This vulnerability highlights the importance of secure coding practices in embedded systems and demonstrates the critical need for proper input validation in network services, particularly those operating without authentication requirements.