CVE-2020-25580 : What You Need to Know

In FreeBSD 12.2-STABLE before r369346, 11.4-STABLE before r369345, 12.2-RELEASE before p4, and 11.4-RELEASE before p8, a regression in the login.access(5) rule processor causes rules to fail to match correctly, potentially leading to ignored access denial rules.

Understanding CVE-2020-25580

This CVE involves a missing authorization issue in FreeBSD versions mentioned above.

What is CVE-2020-25580?

The vulnerability in the login.access(5) rule processor in specific FreeBSD versions may result in access denial rules being disregarded.

The Impact of CVE-2020-25580

The vulnerability could allow unauthorized access to systems due to failed rule matching, potentially compromising system security.

Technical Details of CVE-2020-25580

This section provides more technical insights into the CVE.

Vulnerability Description

A regression in the login.access(5) rule processor causes rules to fail to match correctly, leading to potential access denial rule bypass.

Affected Systems and Versions

FreeBSD 12.2-RELEASE before p4
FreeBSD 11.4-RELEASE before p8

Exploitation Mechanism

The issue occurs due to a flaw in the rule processing mechanism, causing rules to be incorrectly evaluated, leading to access denial rule bypass.

Mitigation and Prevention

Protecting systems from CVE-2020-25580 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply the necessary patches provided by FreeBSD promptly.
Monitor system logs for any unauthorized access attempts.
Review and update access control rules to mitigate the risk of unauthorized access.

Long-Term Security Practices

Regularly update and patch FreeBSD systems to address security vulnerabilities.
Conduct security audits to identify and address any potential authorization issues.
Implement least privilege access controls to limit unauthorized access.

Patching and Updates

Ensure all FreeBSD systems are updated to versions that include the fix for this vulnerability.
Regularly check for security advisories from FreeBSD and apply patches as soon as they are available.