CVE-2021-40874 : Exploit Details and Defense Strategies
Discover the impact and mitigation strategies for CVE-2021-40874 affecting LemonLDAP::NG 2.0.13. Learn about the security flaw in authentication validation.
LemonLDAP::NG (lemonldap-ng) 2.0.13 is affected by a vulnerability in the RESTServer plug-in and Kerberos authentication method, allowing any password to be recognized as valid for an existing user.
Understanding CVE-2021-40874
This CVE identifies a security issue in LemonLDAP::NG version 2.0.13.
What is CVE-2021-40874?
An issue in LemonLDAP::NG 2.0.13 enables the validation of any password for an existing user when using the RESTServer plug-in and Kerberos authentication method along with the Combination authentication plug-in.
The Impact of CVE-2021-40874
The vulnerability leads to a severe security risk where any password can be falsely authenticated for an existing user.
Technical Details of CVE-2021-40874
This section provides in-depth technical insights into the CVE.
Vulnerability Description
The flaw in LemonLDAP::NG 2.0.13 allows the validation of any password for an existing user under specific authentication configurations.
Affected Systems and Versions
- Product: LemonLDAP::NG
- Vendor: Not applicable
- Version: 2.0.13
- Status: Affected
Exploitation Mechanism
The vulnerability occurs when utilizing the RESTServer plug-in and combining the Kerberos authentication method with another method, leading to incorrect password validation.
Mitigation and Prevention
Steps to address and prevent the CVE.
Immediate Steps to Take
- Disable the RESTServer plug-in if not essential for operations.
- Review and adjust authentication method configurations to avoid vulnerable combinations.
Long-Term Security Practices
- Regularly update LemonLDAP::NG to patched versions.
- Conduct security assessments to identify and remediate similar vulnerabilities.
Patching and Updates
Apply patches provided by LemonLDAP::NG to fix the authentication issue.