CVE-2018-6693 : Security Advisory and Response

A Linux system running ENSLTP versions 10.5.1, 10.5.0, and 10.2.3 Hotfix 1246778 and earlier has a vulnerability that allows an unauthorized user to delete any files. This vulnerability exploits a race condition, known as time of check to time of use (TOCTOU), that occurs during a specific scanning process. By taking advantage of this vulnerability, the unauthorized user can escalate their privileges and delete files of their choice.

Understanding CVE-2018-6693

This CVE involves a privilege escalation vulnerability in McAfee's Endpoint Security for Linux Threat Prevention (ENSLTP).

What is CVE-2018-6693?

CVE-2018-6693 is a vulnerability in ENSLTP versions 10.5.1, 10.5.0, and 10.2.3 Hotfix 1246778 and earlier that allows unauthorized users to delete files on a Linux system.

The Impact of CVE-2018-6693

CVSS Base Score: 5.6 (Medium Severity)
Attack Vector: Local
Integrity Impact: High
Privileges Required: Low
User Interaction: Required
Exploitation Complexity: Low

Technical Details of CVE-2018-6693

This section provides more in-depth technical details of the vulnerability.

Vulnerability Description

The vulnerability allows unprivileged users to delete arbitrary files by exploiting a TOCTOU race condition during a specific scanning sequence.

Affected Systems and Versions

Product: Endpoint Security for Linux Threat Prevention (ENSLTP)
Vendor: McAfee
Affected Versions:
10.5.0
10.5.1
10.2.3 Hotfix 1246778

Exploitation Mechanism

The vulnerability leverages a race condition enabling link following (CWE-363) and privilege escalation (CWE-274) to escalate privileges and delete files.

Mitigation and Prevention

Protecting systems from CVE-2018-6693 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly.
Monitor system logs for any suspicious activities.
Restrict user permissions to minimize the impact of unauthorized access.

Long-Term Security Practices

Regularly update and patch all software and systems.
Conduct security training to educate users on best practices and potential threats.
Implement access controls and least privilege principles to limit user capabilities.
Perform regular security audits and vulnerability assessments.

Patching and Updates

McAfee has released patches to address the vulnerability. Ensure all affected systems are updated to the latest secure versions.