CVE-2019-16555 : What You Need to Know

Jenkins Build Failure Analyzer Plugin version 1.24.1 and earlier is susceptible to a vulnerability that allows malicious entities to exploit a user-provided regular expression, potentially leading to unauthorized evaluation by Jenkins.

Understanding CVE-2019-16555

An overview of the impact, technical details, and mitigation strategies related to CVE-2019-16555.

What is CVE-2019-16555?

This CVE identifies a flaw in Jenkins Build Failure Analyzer Plugin versions 1.24.1 and below, where the handling of user-supplied regular expressions lacks interruption capability, enabling attackers to manipulate Jenkins to evaluate regular expressions without interruption.

The Impact of CVE-2019-16555

The vulnerability could be exploited by malicious actors to execute unauthorized regular expression evaluations within Jenkins, potentially leading to security breaches and system compromise.

Technical Details of CVE-2019-16555

Insights into the vulnerability specifics and affected systems.

Vulnerability Description

The issue arises from the processing of user-supplied regular expressions in a non-interruptible manner, allowing for unauthorized evaluation within Jenkins.

Affected Systems and Versions

Product: Jenkins Build Failure Analyzer Plugin
Vendor: Jenkins project
Versions Affected: <= 1.24.1 (custom version)

Exploitation Mechanism

Malicious entities can exploit this vulnerability by manipulating user-provided regular expressions to force Jenkins to evaluate them without interruption.

Mitigation and Prevention

Best practices to address and prevent the CVE-2019-16555 vulnerability.

Immediate Steps to Take

Upgrade Jenkins Build Failure Analyzer Plugin to a patched version above 1.24.1.
Implement strict input validation for user-supplied regular expressions.
Monitor Jenkins logs for any suspicious regular expression evaluations.

Long-Term Security Practices

Regularly update Jenkins and its plugins to the latest secure versions.
Conduct security audits to identify and address potential vulnerabilities in Jenkins configurations.

Patching and Updates

Apply security patches promptly to Jenkins and associated plugins to mitigate known vulnerabilities and enhance system security.