CVE-2020-24612 : Vulnerability Insights and Analysis

An issue in the selinux-policy package allows bypassing 2FA by mishandling the .config/Yubico directory.

Understanding CVE-2020-24612

This CVE involves a vulnerability in the selinux-policy package that impacts the handling of the .config/Yubico directory, potentially enabling attackers to bypass two-factor authentication (2FA).

What is CVE-2020-24612?

The vulnerability in selinux-policy (Reference Policy) version 3.14 through 2020-08-24 allows unauthorized access by disabling the second factor of authentication when SELinux is in enforced mode.

The Impact of CVE-2020-24612

The vulnerability poses a medium severity risk with high confidentiality and integrity impacts. An attacker with knowledge of the password can exploit this to bypass 2FA.

Technical Details of CVE-2020-24612

This section delves into the technical aspects of the CVE.

Vulnerability Description

The mishandling of the .config/Yubico directory in selinux-policy leads to the disabling of the second factor of authentication, allowing password-only access.

Affected Systems and Versions

Package: selinux-policy (Reference Policy)
Versions: 3.14 through 2020-08-24

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Local
Privileges Required: None
User Interaction: None
Scope: Unchanged
Vector String: CVSS:3.1/AC:H/AV:L/A:N/C:H/I:H/PR:N/S:U/UI:N

Mitigation and Prevention

Protect systems from CVE-2020-24612 with the following measures.

Immediate Steps to Take

Update selinux-policy to a patched version.
Monitor system logs for any suspicious activity.

Long-Term Security Practices

Implement multi-factor authentication beyond 2FA.
Regularly review and update SELinux policies.

Patching and Updates

Apply patches provided by the vendor promptly.