CVE-2021-42056 Explained : Impact and Mitigation

Thales Safenet Authentication Client (SAC) for Linux and Windows through 10.7.7 has a vulnerability that can lead to arbitrary command execution.

Understanding CVE-2021-42056

Thales Safenet Authentication Client (SAC) for Linux and Windows through version 10.7.7 is susceptible to a symlink attack, enabling local attackers to overwrite arbitrary files and potentially execute commands with high privileges.

What is CVE-2021-42056?

The CVE-2021-42056 vulnerability in Thales Safenet Authentication Client (SAC) involves the creation of insecure temporary hid and lock files, which can be exploited via a symlink attack by a local attacker.

The Impact of CVE-2021-42056

The vulnerability allows attackers to overwrite arbitrary files and potentially achieve arbitrary command execution with elevated privileges on affected systems.

Technical Details of CVE-2021-42056

Thales Safenet Authentication Client (SAC) for Linux and Windows through version 10.7.7 is at risk due to a specific vulnerability.

Vulnerability Description

The issue stems from the insecure creation of temporary hid and lock files, providing an opportunity for attackers to conduct symlink attacks.

Affected Systems and Versions

Thales Safenet Authentication Client (SAC) for Linux and Windows through version 10.7.7

Exploitation Mechanism

Attackers can leverage symlink attacks to manipulate temporary files, leading to arbitrary file overwriting and potentially enabling command execution with elevated privileges.

Mitigation and Prevention

Steps to address and prevent the CVE-2021-42056 vulnerability.

Immediate Steps to Take

Ensure SAC software is updated to a secure version that addresses the symlink vulnerability.
Implement strict file permissions to limit access to critical system files.
Regularly monitor for any unauthorized file changes or suspicious activities.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments on the software and systems.
Educate users and administrators on best practices for file handling and system security.
Consider implementing file integrity monitoring tools to detect unauthorized changes.

Patching and Updates

Thales or the appropriate vendor should release patches to fix the vulnerability.
Promptly apply any security updates or patches provided by Thales to mitigate the risk of exploitation.