CVE-2020-27888 : Security Advisory and Response

An issue was discovered on Ubiquiti UniFi Meshing Access Point UAP-AC-M 4.3.21.11325 and UniFi Controller 6.0.28 devices where cached credentials are not erased, potentially allowing unintended network access.

Understanding CVE-2020-27888

This CVE identifies a security vulnerability in Ubiquiti UniFi Meshing Access Point UAP-AC-M and UniFi Controller devices.

What is CVE-2020-27888?

The issue involves cached credentials not being cleared from an access point when wirelessly reconnecting after a disconnection, which could lead to unauthorized network access.

The Impact of CVE-2020-27888

The vulnerability may allow unauthorized individuals to gain access to the network, compromising its security and potentially leading to data breaches.

Technical Details of CVE-2020-27888

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

Cached credentials are not properly erased from the access point, creating a security risk upon wireless reconnection.

Affected Systems and Versions

Ubiquiti UniFi Meshing Access Point UAP-AC-M 4.3.21.11325
UniFi Controller 6.0.28

Exploitation Mechanism

The vulnerability occurs when an access point wirelessly reconnects after being disconnected, allowing cached credentials to persist and potentially grant unauthorized network access.

Mitigation and Prevention

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

Immediate Steps to Take

Disable wireless connectivity on affected devices if possible to prevent unauthorized access.
Monitor network activity for any suspicious behavior that may indicate unauthorized access.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities and enhance security measures.
Implement strong network authentication protocols and regularly change passwords to prevent unauthorized access.

Patching and Updates

Check for and apply any available patches or updates provided by Ubiquiti to address this vulnerability and enhance the security of the affected devices.