CVE-2021-21637 : Vulnerability Insights and Analysis
Learn about CVE-2021-21637, a security flaw in Jenkins Team Foundation Server Plugin allowing unauthorized access to sensitive credentials stored in Jenkins. Find out the impact, affected versions, and mitigation steps.
A missing permission check in Jenkins Team Foundation Server Plugin 5.157.1 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.
Understanding CVE-2021-21637
This vulnerability impacts the Jenkins Team Foundation Server Plugin, specifically versions less than or equal to 5.157.1.
What is CVE-2021-21637?
CVE-2021-21637 is a security flaw in Jenkins that enables attackers with specific permissions to connect to a designated URL using obtained credentials, potentially exposing sensitive information stored in Jenkins.
The Impact of CVE-2021-21637
The vulnerability allows unauthorized individuals to access confidential credentials stored within Jenkins, posing a significant risk to the security and integrity of the system.
Technical Details of CVE-2021-21637
The technical aspects of this CVE highlight the following points:
Vulnerability Description
The vulnerability arises from a missing permission check in the Jenkins Team Foundation Server Plugin, giving attackers the ability to exploit the system.
Affected Systems and Versions
This vulnerability affects versions of the Jenkins Team Foundation Server Plugin equal to or less than 5.157.1.
Exploitation Mechanism
Attackers with Overall/Read permission can leverage the flaw to connect to a specified URL using credentials obtained through unauthorized means.
Mitigation and Prevention
To address CVE-2021-21637, consider the following security measures:
Immediate Steps to Take
- Update the Jenkins Team Foundation Server Plugin to a version that contains a patch for this vulnerability.
Long-Term Security Practices
- Regularly review and update permissions and access controls within Jenkins to prevent unauthorized access.
Patching and Updates
- Stay informed about security advisories and promptly apply patches released by Jenkins to prevent exploitation of known vulnerabilities.