CVE-2021-23892 : Vulnerability Insights and Analysis

A privilege escalation vulnerability has been identified in McAfee Endpoint Security (ENS) for Linux, allowing a local user to gain administrator privileges through predictable temporary file locations.

Understanding CVE-2021-23892

This CVE pertains to a time of check to time of use (TOCTOU) race condition during the Endpoint Security for Linux Threat Prevention and Firewall installation process.

What is CVE-2021-23892?

By exploiting a TOCTOU race condition, a local user can perform a privilege escalation attack to obtain administrator privileges for executing arbitrary code.

The Impact of CVE-2021-23892

The vulnerability poses a high impact on confidentiality, integrity, and availability, with a CVSS base score of 8.2 (High severity).

Technical Details of CVE-2021-23892

The vulnerability is classified as CWE-59: Improper Link Resolution Before File Access ('Link Following').

Vulnerability Description

The flaw resides in the ENS TP/FW installation process, where insecure temporary file usage leads to privilege escalation.

Affected Systems and Versions

McAfee Endpoint Security (ENS) for Linux versions less than 10.7.5 are affected by this vulnerability.

Exploitation Mechanism

A local user can exploit this vulnerability through a race condition, allowing them to escalate privileges and execute arbitrary code.

Mitigation and Prevention

To mitigate the risk associated with CVE-2021-23892, users must take immediate steps and adopt long-term security practices.

Immediate Steps to Take

Update McAfee Endpoint Security for Linux to version 10.7.5 or newer.
Monitor for any unusual activities indicating privilege escalation.

Long-Term Security Practices

Regularly update and patch security software and applications.
Implement the principle of least privilege to restrict user access.

Patching and Updates

Stay informed about security advisories and apply patches promptly to protect against known vulnerabilities.