CVE-2023-43650 : What You Need to Know

This article provides detailed information on CVE-2023-43650, a vulnerability that allows non-MFA account takeover via a brute-force attack on weak password reset code in JumpServer.

Understanding CVE-2023-43650

This section explains what CVE-2023-43650 is and the impact it can have.

What is CVE-2023-43650?

JumpServer, an open-source bastion host, is susceptible to a vulnerability where the verification code for resetting a user's password is exploitable via brute-force attacks due to the lack of rate limiting. Users can reset forgotten passwords by entering a 6-digit verification code, which can be systematically guessed within a short window of time.

The Impact of CVE-2023-43650

The absence of rate limiting in the password reset mechanism presents a security risk, potentially allowing unauthorized users to guess and reset accounts' passwords through brute-force attacks.

Technical Details of CVE-2023-43650

This section covers the technical aspects of the vulnerability.

Vulnerability Description

Affected versions of JumpServer (2.0.0 to 2.28.20 and 3.0.0 to 3.7.1) allow attackers to bypass the password reset mechanism by brute-forcing the 6-digit verification code. This issue has been fixed in versions 2.28.20 and 3.7.1.

Affected Systems and Versions

JumpServer versions ranging from 2.0.0 to 2.28.20 and 3.0.0 to 3.7.1 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit the weak password reset code by systematically guessing the 6-digit verification code sent to users, enabling unauthorized access to user accounts.

Mitigation and Prevention

This section outlines steps to mitigate the vulnerability and prevent future occurrences.

Immediate Steps to Take

Affected users are strongly advised to update their JumpServer installations to versions 2.28.20 or 3.7.1 to patch the vulnerability and prevent unauthorized account takeover.

Long-Term Security Practices

Implement multi-factor authentication (MFA) mechanisms to enhance the security of JumpServer accounts and protect against unauthorized access attempts.

Patching and Updates

Regularly check for security updates and patches provided by JumpServer to address known vulnerabilities and enhance the overall security posture of the system.