CVE-2020-5739 : Exploit Details and Defense Strategies

Grandstream GXP1600 series firmware 1.0.4.152 and below is vulnerable to authenticated remote command execution via OpenVPN up script injection.

Understanding CVE-2020-5739

This CVE identifies a security vulnerability in the Grandstream GXP1600 Series firmware that allows attackers to execute commands remotely with root privileges.

What is CVE-2020-5739?

The vulnerability in the Grandstream GXP1600 series firmware version 1.0.4.152 and below enables authenticated attackers to execute commands remotely by adding a malicious OpenVPN up script through the phone's VPN settings.

The Impact of CVE-2020-5739

The exploitation of this vulnerability can lead to unauthorized remote command execution with elevated privileges, posing a significant security risk to affected devices.

Technical Details of CVE-2020-5739

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows authenticated attackers to inject malicious OpenVPN up scripts via the phone's VPN settings, leading to the execution of arbitrary commands with root privileges.

Affected Systems and Versions

Product: Grandstream GXP1600 Series
Versions Affected: 1.0.4.152 and below

Exploitation Mechanism

Attackers add a malicious OpenVPN up script through the phone's VPN settings.
Upon establishing the VPN connection, the injected script is executed with root privileges.

Mitigation and Prevention

Protecting systems from CVE-2020-5739 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the firmware to a non-vulnerable version.
Disable remote access to the device if not required.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update firmware and security patches.
Implement strong access controls and authentication mechanisms.

Patching and Updates

Apply patches provided by Grandstream to address the vulnerability.