CVE-2021-20147 : Vulnerability Insights and Analysis
Learn about CVE-2021-20147 affecting ManageEngine ADSelfService Plus below build 6116, enabling attackers to determine Windows domain user presence.
ManageEngine ADSelfService Plus below build 6116 has been identified with a critical vulnerability allowing an unauthenticated remote attacker to determine the existence of a Windows domain user through an observable response discrepancy.
Understanding CVE-2021-20147
This CVE-2021-20147 affects ManageEngine ADSelfService Plus versions below build 6116, posing a risk to Windows domain user privacy.
What is CVE-2021-20147?
ManageEngine ADSelfService Plus below build 6116 exposes an observable response discrepancy in the UMCP operation of the ChangePasswordAPI, enabling unauthorized remote adversaries to verify the presence of a Windows domain user.
The Impact of CVE-2021-20147
The vulnerability in ManageEngine ADSelfService Plus can be exploited by unauthenticated attackers to ascertain the existence of Windows domain users, potentially leading to unauthorized access and security breaches.
Technical Details of CVE-2021-20147
The technical specifics of the CVE-2021-20147 vulnerability include:
Vulnerability Description
The vulnerability stems from an observable response discrepancy in the UMCP operation of the ChangePasswordAPI in ManageEngine ADSelfService Plus versions below build 6116.
Affected Systems and Versions
- Affected Product: ManageEngine ADSelfService Plus
- Vendor: Not Available
- Vulnerable Versions: Below build 6116
Exploitation Mechanism
Unauthorized remote threat actors can leverage the observable response discrepancy to confirm the presence of Windows domain users without authentication.
Mitigation and Prevention
To address CVE-2021-20147, consider the following mitigation strategies:
Immediate Steps to Take
- Upgrade ManageEngine ADSelfService Plus to version 6116 or higher to eliminate the vulnerability.
- Monitor network traffic for any suspicious activity indicating exploitation attempts.
Long-Term Security Practices
- Implement proper access controls and authentication mechanisms to prevent unauthorized access.
- Regularly audit and review user accounts to identify and remove any unauthorized entities.
Patching and Updates
Stay informed about security updates and patches for ManageEngine ADSelfService Plus to ensure protection against known vulnerabilities.