CVE-2022-24403 : Security Advisory and Response

This article provides detailed information about a de-anonymization attack in TETRA affecting the TA61 version.

Understanding CVE-2022-24403

This CVE-2022-24403 relates to a vulnerability in the TETRA Standard's TA61 version that could lead to de-anonymization attacks.

What is CVE-2022-24403?

The TETRA TA61 identity encryption function is vulnerable to a de-anonymization attack due to the recovery of a 64-bit value from the SCK or CCK, allowing adversaries to encrypt or decrypt arbitrary identities.

The Impact of CVE-2022-24403

The vulnerability poses a high severity risk with a base score of 4.3, potentially exposing encrypted identities to malicious actors.

Technical Details of CVE-2022-24403

This section dives into the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The TA61 version of TETRA uses a 64-bit value derived from SCK or CCK, enabling efficient recovery of the value, leading to identity encryption vulnerabilities.

Affected Systems and Versions

The TETRA Standard's TA61 version is specifically impacted by this vulnerability.

Exploitation Mechanism

Adversaries can leverage the recovered 64-bit value to encrypt or decrypt identities with knowledge of only three encrypted/unencrypted identity pairs.

Mitigation and Prevention

Discover the immediate steps to take, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

Users should consider implementing additional encryption mechanisms and monitoring for any suspicious activity related to identity encryption.

Long-Term Security Practices

Establish robust encryption protocols, conduct regular security audits, and train personnel on identity protection practices.

Patching and Updates

Stay vigilant for security advisories from ETSI regarding patches to address the vulnerability in the TA61 version of the TETRA Standard.