Overview
CVE-2021-4469 details a significant security vulnerability affecting Denver SHO-110 IP cameras. This flaw allows unauthorized access to image snapshots from the camera feed, potentially compromising the privacy and security of the monitored environment. The vulnerability stems from a secondary HTTP service running on TCP port 8001, which lacks authentication requirements for accessing the ‘/snapshot’ endpoint.
Technical Details
The Denver SHO-110 IP camera exposes a secondary HTTP service alongside its primary web interface. While the main web interface requires authentication, the service on port 8001 provides a backdoor. Specifically, the ‘/snapshot’ endpoint on port 8001 can be accessed without any form of authentication. This means that any remote attacker can directly request this endpoint and retrieve a current image snapshot from the camera. Repeatedly requesting the ‘/snapshot’ endpoint allows an attacker to reconstruct a near real-time video stream from the camera, effectively bypassing the intended security measures.
CVSS Analysis
Due to the lack of an official CVSS score assigned to CVE-2021-4469, we cannot provide a specific severity rating. However, based on the potential impact, this vulnerability could be classified as Medium to High severity. The lack of authentication and ease of exploitation contribute to the potential risk.
Possible Impact
The unauthenticated snapshot access vulnerability in the Denver SHO-110 IP camera can lead to several serious consequences:
- Privacy Violation: Attackers can monitor the camera feed and gain unauthorized access to sensitive information and activities.
- Security Breach: The compromised camera feed can be used to plan burglaries or other malicious activities.
- Reputational Damage: Organizations or individuals using the vulnerable camera may suffer reputational damage if the vulnerability is exploited.
- Blackmail/Extortion: Compromised footage could be used for blackmail or extortion purposes.
Mitigation or Patch Steps
Unfortunately, at the time of writing, there is no official patch or firmware update available from Denver to address CVE-2021-4469. Therefore, the following mitigation steps are recommended:
- Discontinue Use: The most effective solution is to discontinue the use of the Denver SHO-110 IP camera and replace it with a more secure alternative.
- Network Segmentation: If discontinuing use is not possible, isolate the camera on a separate network segment with strict firewall rules. Block all unnecessary traffic to and from the camera, especially access to port 8001 from outside the local network.
- Monitor Network Traffic: Monitor network traffic for unusual activity related to the camera’s IP address, such as frequent requests to port 8001.
