CVE-2023-43652 : Vulnerability Insights and Analysis

This article discusses CVE-2023-43652, a vulnerability in JumpServer that allows non-MFA account takeover by using only SSH public key to login in a jumpserver.

Understanding CVE-2023-43652

In this section, we will explore the details of CVE-2023-43652.

What is CVE-2023-43652?

CVE-2023-43652 involves a missing authorization vulnerability in JumpServer where an unauthenticated user can authenticate to the core API by providing a username and an SSH public key without needing a password or corresponding SSH private key. This could lead to unauthorized access.

The Impact of CVE-2023-43652

The vulnerability allows attackers to gain access to user information and authorized actions without proper authentication, potentially leading to serious confidentiality breaches.

Technical Details of CVE-2023-43652

In this section, we will delve into the technical aspects of CVE-2023-43652.

Vulnerability Description

JumpServer, an open-source bastion host, provides an API for user private key logins without verifying the source of requests, enabling attackers to exploit leaked public keys for unauthorized access.

Affected Systems and Versions

Versions of JumpServer between 2.0.0 to 2.28.20 and 3.0.0 to 3.7.1 are affected by this vulnerability, highlighting the importance of updating to the patched versions.

Exploitation Mechanism

Attackers can leverage the leaked public keys and usernames to bypass authentication barriers, gaining entry to sensitive user data and actions.

Mitigation and Prevention

To address CVE-2023-43652, users and organizations can take the following steps:

Immediate Steps to Take

Upgrade JumpServer to versions 2.28.20 or 3.7.1 to mitigate the vulnerability immediately.

Long-Term Security Practices

Avoid using SSH public keys as the sole authentication method.

Patching and Updates

Regularly update systems and software to stay protected against security vulnerabilities.