CVE-2020-2102 : Vulnerability Insights and Analysis

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier used a non-constant time comparison function when validating an HMAC.

Understanding CVE-2020-2102

This CVE record pertains to a vulnerability in Jenkins versions 2.218 and earlier, as well as LTS 2.204.1 and earlier.

What is CVE-2020-2102?

CVE-2020-2102 is a security vulnerability in Jenkins that involves a non-constant time comparison function during HMAC validation.

The Impact of CVE-2020-2102

This vulnerability could potentially allow attackers to exploit timing discrepancies to gain unauthorized access or perform other malicious activities.

Technical Details of CVE-2020-2102

This section provides more in-depth technical information about the CVE.

Vulnerability Description

Jenkins versions 2.218 and earlier, as well as LTS 2.204.1 and earlier, are affected by a non-constant time comparison function vulnerability in HMAC validation.

Affected Systems and Versions

Product: Jenkins
Vendor: Jenkins project
Versions affected:
Jenkins <= 2.218
LTS <= 2.204.1

Exploitation Mechanism

The vulnerability arises from the improper implementation of the comparison function, which could be exploited by attackers to bypass security measures.

Mitigation and Prevention

Protecting systems from CVE-2020-2102 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Jenkins to a patched version that addresses the non-constant time comparison issue.
Monitor for any unauthorized access or unusual activities on the Jenkins platform.

Long-Term Security Practices

Regularly update Jenkins and other software components to mitigate potential vulnerabilities.
Implement strong access controls and authentication mechanisms to prevent unauthorized access.

Patching and Updates

Apply security patches provided by Jenkins project to fix the vulnerability.