CVE-2020-2223 : Security Advisory and Response
Learn about CVE-2020-2223 affecting Jenkins versions 2.244 and earlier, LTS 2.235.1 and earlier. Understand the impact, exploitation, and mitigation steps for this cross-site scripting vulnerability.
Jenkins 2.244 and earlier, LTS 2.235.1 and earlier versions are affected by a stored cross-site scripting vulnerability due to incorrect escaping of the 'href' attribute in links to downstream jobs.
Understanding CVE-2020-2223
This CVE record highlights a security issue in Jenkins versions that could lead to cross-site scripting attacks.
What is CVE-2020-2223?
CVE-2020-2223 is a vulnerability in Jenkins versions 2.244 and earlier, LTS 2.235.1 and earlier, where the 'href' attribute in links to downstream jobs is not properly escaped, allowing for stored cross-site scripting attacks.
The Impact of CVE-2020-2223
The vulnerability could be exploited by attackers to inject malicious scripts into the build console page, potentially leading to unauthorized access, data theft, or other malicious activities.
Technical Details of CVE-2020-2223
This section provides more technical insights into the vulnerability.
Vulnerability Description
Jenkins versions 2.244 and earlier, LTS 2.235.1 and earlier are susceptible to stored cross-site scripting due to inadequate escaping of the 'href' attribute in downstream job links.
Affected Systems and Versions
- Jenkins versions <= 2.244
- LTS versions <= 2.235.1
Exploitation Mechanism
Attackers can exploit this vulnerability by injecting malicious scripts into the 'href' attribute of links to downstream jobs, which are then executed in the context of the user's browser.
Mitigation and Prevention
Protecting systems from CVE-2020-2223 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Upgrade Jenkins to a patched version that addresses the vulnerability.
- Monitor and restrict user input to prevent script injection.
Long-Term Security Practices
- Regularly update Jenkins and apply security patches promptly.
- Educate users on safe browsing practices and the risks of cross-site scripting attacks.
Patching and Updates
Ensure that all systems running Jenkins are regularly updated with the latest security patches to mitigate the risk of cross-site scripting vulnerabilities.