CVE-2019-10374 : Exploit Details and Defense Strategies

Jenkins PegDown Formatter Plugin 1.3 and earlier versions are affected by a stored cross-site scripting vulnerability that allows attackers to insert malicious links into the Jenkins UI.

Understanding CVE-2019-10374

Jenkins PegDown Formatter Plugin 1.3 and earlier versions are susceptible to stored cross-site scripting attacks, enabling threat actors to inject harmful links into the Jenkins user interface.

What is CVE-2019-10374?

This CVE identifies a stored cross-site scripting vulnerability in Jenkins PegDown Formatter Plugin versions 1.3 and earlier. Attackers can exploit this flaw to insert links with malicious JavaScript code into the Jenkins UI by manipulating descriptions and other fields using the configured markup formatter.

The Impact of CVE-2019-10374

The vulnerability poses a significant risk as it allows attackers to execute arbitrary JavaScript code within the context of the affected Jenkins application. This could lead to various malicious activities, including data theft, privilege escalation, and further compromise of the Jenkins environment.

Technical Details of CVE-2019-10374

Jenkins PegDown Formatter Plugin 1.3 and earlier versions are affected by a stored cross-site scripting vulnerability.

Vulnerability Description

The stored cross-site scripting vulnerability in Jenkins PegDown Formatter Plugin versions 1.3 and earlier enables attackers with the ability to edit descriptions and other fields using the configured markup formatter to insert links containing JavaScript code into the Jenkins UI.

Affected Systems and Versions

Product: Jenkins PegDown Formatter Plugin
Vendor: Jenkins project
Versions Affected: 1.3 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating descriptions and other fields that utilize the configured markup formatter to inject links with malicious JavaScript code into the Jenkins UI.

Mitigation and Prevention

To address CVE-2019-10374, users and administrators should take immediate steps to mitigate the risk and prevent potential exploitation.

Immediate Steps to Take

Update Jenkins PegDown Formatter Plugin to the latest patched version that addresses the vulnerability.
Regularly monitor and review descriptions and fields within Jenkins to detect any unauthorized changes.
Implement strict input validation and output encoding to prevent cross-site scripting attacks.

Long-Term Security Practices

Conduct regular security assessments and audits of Jenkins plugins and configurations.
Educate users and administrators on secure coding practices and the risks associated with cross-site scripting vulnerabilities.

Patching and Updates

Stay informed about security advisories and updates from Jenkins to promptly apply patches for known vulnerabilities.