NULL Pointer Dereference in GeoVision GV-LPC2011 and GV-LPC2211

Executive Summary

This vulnerability is an unauthenticated NULL pointer dereference in the HTTP request parsing logic of multiple CGI components in GeoVision GV-LPC2011 and GV-LPC2211 version 1.12 and earlier.

It occurs because the affected components do not properly validate required HTTP request metadata before using it.

A remote attacker can exploit this by sending a specially crafted HTTP request that triggers the NULL pointer dereference, causing the affected process to crash.

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Detection Guidance

This vulnerability can be detected by monitoring for crashes or denial of service symptoms in the affected GeoVision GV-LPC2011 and GV-LPC2211 devices when they receive malformed HTTP requests. Network intrusion detection systems (NIDS) or web application firewalls (WAF) can be configured to detect specially crafted HTTP requests that target the HTTP request parsing logic of these devices.

Specific commands to detect this vulnerability are not provided in the available information. However, general network monitoring commands such as capturing HTTP traffic with tools like tcpdump or Wireshark and analyzing for unusual or malformed HTTP requests targeting the devices could be useful.

• Use tcpdump to capture HTTP traffic: tcpdump -i <interface> port 80 or 443 -w capture.pcap
• Analyze captured traffic with Wireshark to identify suspicious HTTP requests.
• Monitor device logs for crashes or unexpected restarts indicating exploitation attempts.

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Impact Analysis

Exploitation of this vulnerability can cause the affected process to crash, resulting in a denial of service (DoS).

Since the vulnerability is unauthenticated and remotely exploitable, an attacker can cause service disruption without needing any credentials.

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Compliance Impact

This vulnerability causes a denial of service by crashing the affected process through a NULL pointer dereference in HTTP request parsing. It does not directly impact confidentiality or integrity of data.

Since the vulnerability does not lead to unauthorized data access or data leakage, its direct effect on compliance with standards like GDPR or HIPAA, which focus on protecting personal and sensitive data, is limited.

However, denial of service conditions can affect availability, which is a component of some compliance frameworks. Organizations relying on the affected devices should consider the risk of service disruption in their compliance and risk management processes.

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Mitigation Strategies

Immediate mitigation steps include applying any available firmware or software updates provided by GeoVision for the affected GV-LPC2011 and GV-LPC2211 devices. GeoVision follows a structured vulnerability management process and releases unscheduled updates for critical vulnerabilities such as this one.

If updates are not yet available, consider implementing network-level protections such as blocking or filtering suspicious HTTP requests to the affected devices, restricting access to the devices from untrusted networks, and monitoring for exploitation attempts.

Contact GeoVision support or check their cybersecurity advisories page regularly for patches and detailed mitigation instructions.

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