CVE-2018-1000406 Explained : Impact and Mitigation
Learn about CVE-2018-1000406 affecting Jenkins versions 2.145 and earlier, allowing attackers to write arbitrary files on the Jenkins master. Find mitigation steps and preventive measures here.
Jenkins versions 2.145 and earlier, as well as LTS versions 2.138.1 and earlier, are vulnerable to a path traversal exploit that allows attackers to write arbitrary files on the Jenkins master.
Understanding CVE-2018-1000406
This CVE involves a vulnerability in Jenkins that enables attackers with specific permissions to manipulate file parameters and write files outside the intended directory.
What is CVE-2018-1000406?
A path traversal vulnerability in Jenkins versions 2.145 and earlier, as well as LTS versions 2.138.1 and earlier, allows attackers with Job/Configure permission to specify a file parameter with a name outside the intended directory, leading to unauthorized file writes on the Jenkins master.
The Impact of CVE-2018-1000406
This vulnerability can be exploited by malicious actors with Job/Configure permission, potentially resulting in unauthorized file manipulation and compromise of the Jenkins master.
Technical Details of CVE-2018-1000406
Jenkins is susceptible to a path traversal vulnerability that can be leveraged by attackers with specific permissions to compromise the system.
Vulnerability Description
The 'FileParameterValue.java' file in the 'core/src/main/java/hudson/model' directory of Jenkins is the source of the vulnerability, allowing attackers to write arbitrary files on the Jenkins master.
Affected Systems and Versions
- Jenkins versions 2.145 and earlier
- LTS versions 2.138.1 and earlier
Exploitation Mechanism
Attackers with Job/Configure permission can exploit this vulnerability by specifying a file parameter with a file name outside of the intended directory, enabling them to write arbitrary files on the Jenkins master when scheduling a build.
Mitigation and Prevention
To address CVE-2018-1000406, immediate actions and long-term security practices are essential.
Immediate Steps to Take
- Upgrade Jenkins to a non-vulnerable version immediately.
- Restrict Job/Configure permissions to trusted users only.
Long-Term Security Practices
- Regularly monitor and audit file write activities on the Jenkins master.
- Implement access controls and least privilege principles to limit exposure to vulnerabilities.
Patching and Updates
- Apply patches and updates provided by Jenkins to fix the vulnerability and enhance system security.