CVE-2020-5759 : Exploit Details and Defense Strategies

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH, allowing authenticated remote attackers to execute commands as the root user.

Understanding CVE-2020-5759

This CVE identifies a critical vulnerability in the Grandstream UCM6200 Series firmware.

What is CVE-2020-5759?

The vulnerability in the Grandstream UCM6200 Series firmware allows authenticated remote attackers to execute commands as the root user through a specially crafted 'unset' command.

The Impact of CVE-2020-5759

The exploitation of this vulnerability can lead to unauthorized access and control over the affected system, potentially resulting in data breaches, system compromise, and other malicious activities.

Technical Details of CVE-2020-5759

This section provides technical details about the vulnerability.

Vulnerability Description

The vulnerability in Grandstream UCM6200 Series firmware version 1.0.20.23 and below allows for OS command injection via SSH, enabling attackers to execute commands with root privileges.

Affected Systems and Versions

Product: Grandstream UCM6200 Series
Versions Affected: 1.0.20.23 and below

Exploitation Mechanism

Attackers can exploit this vulnerability by issuing a specially crafted 'unset' command via SSH, gaining unauthorized root access to the system.

Mitigation and Prevention

Protecting systems from CVE-2020-5759 requires immediate action and long-term security measures.

Immediate Steps to Take

Update the firmware to a non-vulnerable version immediately.
Restrict SSH access to trusted users only.
Monitor SSH logs for any suspicious activities.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent vulnerabilities.
Implement strong authentication mechanisms and access controls.
Conduct regular security audits and penetration testing to identify and address potential weaknesses.

Patching and Updates

Apply patches and updates provided by Grandstream for the UCM6200 Series firmware to address the vulnerability and enhance system security.