CVE-2020-25754 : Exploit Details and Defense Strategies

An issue was discovered on Enphase Envoy R3.x and D4.x devices where a custom PAM module for user authentication bypasses traditional methods by using a password derived from the MD5 hash of the username and serial number.

Understanding CVE-2020-25754

This CVE highlights a vulnerability in Enphase Envoy devices that could allow unauthorized access to user accounts.

What is CVE-2020-25754?

The vulnerability involves a custom PAM module that generates passwords using the MD5 hash of the username and serial number, which can be obtained by unauthenticated users.

The Impact of CVE-2020-25754

This vulnerability could lead to unauthorized access to Enphase Envoy devices, compromising user accounts and potentially allowing malicious actors to manipulate device settings.

Technical Details of CVE-2020-25754

Enphase Envoy R3.x and D4.x devices are affected by this vulnerability.

Vulnerability Description

The custom PAM module used for user authentication on these devices allows for password generation using easily obtainable information, making it susceptible to unauthorized access.

Affected Systems and Versions

Enphase Envoy R3.x devices
Enphase Envoy D4.x devices

Exploitation Mechanism

The vulnerability stems from the use of a password derived from the MD5 hash of the username and serial number, which can be accessed by unauthenticated users.

Mitigation and Prevention

It is crucial to take immediate steps to secure affected devices and implement long-term security practices.

Immediate Steps to Take

Disable remote access to the devices if not required
Regularly monitor device logs for any suspicious activities
Change default passwords and implement strong, unique passwords

Long-Term Security Practices

Keep devices up to date with the latest firmware and security patches
Conduct regular security audits and penetration testing to identify vulnerabilities

Patching and Updates

Enphase may release patches or updates to address this vulnerability, so ensure devices are promptly updated with the latest software releases.