CVE-2021-23155 : What You Need to Know

This article provides detailed information about CVE-2021-23155, a critical vulnerability impacting Gallagher Command Centre Mobile Client for Android, allowing a man-in-the-middle attack.

Understanding CVE-2021-23155

CVE-2021-23155 is an issue in the Command Centre Mobile Client for Android versions 8.60 and prior, which could enable an attacker to impersonate the legitimate Command Centre Server through improper validation of the cloud certificate chain.

What is CVE-2021-23155?

The vulnerability in Gallagher's Command Centre Mobile Client for Android versions prior to 8.60.065 and 8.50 allows a potential man-in-the-middle attack due to insufficient certificate chain validation, posing a critical threat to confidentiality and integrity.

The Impact of CVE-2021-23155

With a CVSS v3.1 base score of 9, this critical vulnerability has a high impact on confidentiality, integrity, and availability, with no privileges required for exploitation, emphasizing the urgency of mitigation.

Technical Details of CVE-2021-23155

The following details shed light on the technical aspects of CVE-2021-23155, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from inadequate validation of the cloud certificate chain in the Command Centre Mobile Client for Android, facilitating a man-in-the-middle attack scenario where an adversary can intercept traffic.

Affected Systems and Versions

Gallagher Command Centre Mobile Client for Android versions prior to 8.60.065 and 8.50 are confirmed to be impacted by this vulnerability, necessitating immediate action to secure vulnerable installations.

Exploitation Mechanism

Exploiting CVE-2021-23155 involves an attacker intercepting the communication between the Command Centre Mobile Client and Server by impersonating the server, compromising the confidentiality and integrity of the system.

Mitigation and Prevention

To safeguard systems from the risks associated with CVE-2021-23155, it is crucial to undertake immediate steps, adopt long-term security practices, and prioritize patching and updates.

Immediate Steps to Take

Update affected Command Centre Mobile Client for Android to version 8.60.065 or above to mitigate the vulnerability effectively.

Long-Term Security Practices

Implement robust certificate validation mechanisms and encryption practices to prevent man-in-the-middle attacks and enhance overall security posture.

Patching and Updates

Regularly monitor security advisories and apply vendor-recommended patches promptly to address vulnerabilities and ensure the protection of critical systems.