CVE-2023-45140 : What You Need to Know

A detailed analysis of CVE-2023-45140 focusing on the group-based JIT MFA bypass on scp and sftp in The Bastion.

Understanding CVE-2023-45140

In this section, we will dive deep into the nature of CVE-2023-45140.

What is CVE-2023-45140?

The Bastion, a tool for SSH access authorization and auditability, was found to have a vulnerability where SCP and SFTP plugins did not enforce group-based JIT MFA, allowing unauthorized access.

The Impact of CVE-2023-45140

The vulnerability in The Bastion could lead to unauthorized access through SCP and SFTP connections without the required multi-factor authentication.

Technical Details of CVE-2023-45140

Let's explore the technical aspects of CVE-2023-45140 in more detail.

Vulnerability Description

The SCP and SFTP plugins in The Bastion failed to enforce group-based JIT MFA, resulting in a security gap that enabled unauthorized access without proper multi-factor authentication.

Affected Systems and Versions

The vulnerability affects versions of The Bastion ranging from 3.0.0 to 3.14.0, with version 3.14.15 being the patched release.

Exploitation Mechanism

Establishing SCP/SFTP connections through The Bastion in a group access scenario, where MFA should be enforced, allows users to bypass the MFA requirement, gaining unauthorized access.

Mitigation and Prevention

Learn about the necessary steps to mitigate and prevent the exploitation of CVE-2023-45140.

Immediate Steps to Take

Users are advised to update to The Bastion version 3.14.15 or above to address the vulnerability and ensure proper enforcement of JIT MFA for group-based access.

Long-Term Security Practices

Incorporating routine security assessments, monitoring, and training can fortify defenses against similar vulnerabilities in the future.

Patching and Updates

Regularly updating software, especially security patches, is crucial to stay protected against known vulnerabilities.