CVE-2018-1999043 : Security Advisory and Response
Learn about CVE-2018-1999043, a denial of service vulnerability in Jenkins versions 2.137 and earlier, impacting BasicAuthenticationFilter.java and BasicHeaderApiTokenAuthenticator.java. Find out how to mitigate and prevent this issue.
Jenkins versions 2.137 and earlier, as well as 2.121.2 and earlier, are susceptible to a denial of service vulnerability due to issues in BasicAuthenticationFilter.java and BasicHeaderApiTokenAuthenticator.java.
Understanding CVE-2018-1999043
This CVE involves a vulnerability that allows attackers to create temporary user records in the system's memory by attempting to log in using invalid credentials.
What is CVE-2018-1999043?
The BasicAuthenticationFilter.java and BasicHeaderApiTokenAuthenticator.java files in Jenkins versions 2.137 and earlier, and 2.121.2 and earlier, are affected by a denial of service vulnerability. This vulnerability enables attackers to generate temporary user records in the system's memory by trying to log in using invalid credentials.
The Impact of CVE-2018-1999043
The vulnerability can lead to a denial of service attack, potentially disrupting the availability of the Jenkins system and causing system instability.
Technical Details of CVE-2018-1999043
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The vulnerability in Jenkins versions 2.137 and earlier, 2.121.2 and earlier, allows attackers to exploit BasicAuthenticationFilter.java and BasicHeaderApiTokenAuthenticator.java to create temporary user records in the system's memory.
Affected Systems and Versions
- Jenkins versions 2.137 and earlier
- Jenkins versions 2.121.2 and earlier
Exploitation Mechanism
Attackers can trigger this vulnerability by attempting to log in using invalid credentials, which results in the creation of temporary user records in the system's memory.
Mitigation and Prevention
Protecting systems from CVE-2018-1999043 is crucial to maintaining security.
Immediate Steps to Take
- Update Jenkins to a non-vulnerable version
- Monitor login attempts for suspicious activities
- Implement strong password policies
Long-Term Security Practices
- Regularly update Jenkins and all its components
- Conduct security training for users to recognize phishing attempts
Patching and Updates
Apply patches provided by Jenkins to address the vulnerability and prevent exploitation.