CVE-2021-43517 : Vulnerability Insights and Analysis

This CVE involves a backdoor in the FOSCAM Camera FI9805E with specific firmware versions that opens a Telnet port upon receiving a special command on a particular port.

Understanding CVE-2021-43517

This CVE exposes a security vulnerability in FOSCAM cameras that could lead to unauthorized access through a backdoor.

What is CVE-2021-43517?

The FOSCAM Camera FI9805E with firmware V4.02.R12.00018510.10012.143900.00000 contains a backdoor that triggers the opening of a Telnet port when a specific command is sent to port 9530.

The Impact of CVE-2021-43517

The vulnerability potentially allows attackers to gain unauthorized access to the affected camera, compromising the security and privacy of the device and its surroundings.

Technical Details of CVE-2021-43517

This section delves into the technical aspects of the CVE.

Vulnerability Description

The presence of a backdoor in the FOSCAM Camera FI9805E firmware allows unauthorized parties to open a Telnet port through a specific command.

Affected Systems and Versions

Product: FOSCAM Camera FI9805E
Firmware Version: V4.02.R12.00018510.10012.143900.00000

Exploitation Mechanism

Attackers can exploit the backdoor by sending a tailored command to port 9530, which triggers the opening of the Telnet port.

Mitigation and Prevention

It is crucial to take immediate action to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Disable Telnet services on the affected device if not needed.
Regularly monitor network traffic for any suspicious activities.

Long-Term Security Practices

Keep firmware and software up to date to patch known vulnerabilities.
Implement strong passwords and multi-factor authentication to enhance security measures.

Patching and Updates

Check for firmware updates or patches provided by FOSCAM to address the backdoor issue and apply them promptly.