CVE-2018-1000408 : Security Advisory and Response
Learn about CVE-2018-1000408 affecting Jenkins versions 2.145 and earlier, allowing unauthorized access to designated URLs, potentially leading to memory user record creation.
Jenkins versions 2.145 and earlier, as well as LTS versions 2.138.1 and earlier, have a vulnerability that allows unauthorized access to a designated URL, potentially leading to the creation of temporary user records in memory.
Understanding CVE-2018-1000408
This CVE involves a weakness in Jenkins versions that can be exploited by attackers lacking specific permissions.
What is CVE-2018-1000408?
The vulnerability is located in the file HudsonPrivateSecurityRealm.java within the core/src/main/java/hudson/security/ directory. It permits unauthorized access to a specific URL on instances using the default Jenkins user database security realm.
The Impact of CVE-2018-1000408
Unauthorized access can result in the generation of temporary user records in the system's memory, potentially leading to security breaches and unauthorized actions.
Technical Details of CVE-2018-1000408
This section provides more technical insights into the vulnerability.
Vulnerability Description
A denial of service vulnerability exists in Jenkins versions 2.145 and earlier, LTS 2.138.1 and earlier, allowing attackers without specific permissions to access a URL, creating ephemeral user records in memory.
Affected Systems and Versions
- Jenkins versions 2.145 and earlier
- LTS versions 2.138.1 and earlier
Exploitation Mechanism
Attackers lacking Overall/Read permission can exploit this vulnerability to access a designated URL within the Jenkins user database security realm.
Mitigation and Prevention
Protecting systems from CVE-2018-1000408 is crucial for maintaining security.
Immediate Steps to Take
- Update Jenkins to the latest version to patch the vulnerability.
- Restrict access permissions to critical areas within Jenkins.
Long-Term Security Practices
- Regularly monitor and audit user access and permissions.
- Implement multi-factor authentication for enhanced security.
Patching and Updates
- Apply security patches promptly to address known vulnerabilities and enhance system security.