CVE-2018-6407 in CIPCAMPTIWL
Summary
by MITRE
An issue was discovered on Conceptronic CIPCAMPTIWL V3 0.61.30.21 devices. An unauthenticated attacker can crash a device by sending a POST request with a huge body size to /hy-cgi/devices.cgi?cmd=searchlandevice. The crash completely freezes the device.
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Analysis
by VulDB Data Team • 12/31/2019
This vulnerability exists in Conceptronic CIPCAMPTIWL V3 0.61.30.21 network video surveillance devices where an unauthenticated attacker can cause a complete device freeze by sending a malformed POST request to the /hy-cgi/devices.cgi?cmd=searchlandevice endpoint. The flaw represents a classic buffer overflow condition or memory exhaustion vulnerability that occurs when the device fails to properly validate or limit the size of incoming request bodies. This type of vulnerability falls under CWE-122, which describes buffer overflow conditions where insufficient validation allows an attacker to write beyond allocated memory boundaries, and may also align with CWE-770 when resources are not properly constrained.
The technical implementation of this vulnerability exploits the device's insufficient input validation mechanisms during the processing of CGI requests. When the device receives a POST request with an excessively large payload, it lacks proper size checking and memory allocation controls that would normally prevent such conditions. The attack vector specifically targets the searchlandevice command within the devices.cgi interface, suggesting that the device's web server component does not adequately sanitize or limit the size of data received during device discovery operations. This represents a failure in the principle of least privilege and input validation, as the device accepts arbitrary data sizes without proper boundary checks.
The operational impact of this vulnerability is significant as it allows for a complete denial of service condition where the affected device becomes completely unresponsive and frozen. This renders the surveillance camera ineffective for its intended security purposes, potentially creating blind spots in monitored areas. The vulnerability is particularly concerning because it requires no authentication, making it accessible to any attacker on the network. From an ATT&CK framework perspective, this represents a privilege escalation and denial of service technique that could be used as part of a broader attack chain to compromise security monitoring systems. The device freeze condition suggests that the underlying operating system or web server component may have experienced a critical memory corruption or process termination.
Mitigation strategies should focus on implementing proper input validation and size limiting for all web service endpoints, particularly those used for device discovery and management functions. Network segmentation and access control measures should be implemented to limit exposure of these devices to untrusted networks. Regular firmware updates and security patches should be applied immediately upon availability. The device should be configured to reject requests exceeding predetermined size limits, and monitoring should be implemented to detect unusual traffic patterns that may indicate exploitation attempts. Additionally, network-based intrusion detection systems should be configured to alert on suspicious POST requests targeting CGI interfaces with large payload sizes. This vulnerability highlights the importance of secure coding practices and input validation in embedded network devices, particularly those used in security-critical applications where availability is paramount.