CVE-2019-10404 : Exploit Details and Defense Strategies

Jenkins versions prior to 2.196 and LTS versions prior to 2.176.3 were vulnerable to stored cross-site scripting attacks due to improper escaping of blocked queue item reasons.

Understanding CVE-2019-10404

This CVE identifies a vulnerability in Jenkins that could be exploited by attackers to execute stored cross-site scripting attacks.

What is CVE-2019-10404?

CVE-2019-10404 is a security vulnerability in Jenkins versions before 2.196 and LTS versions before 2.176.3 that allowed stored cross-site scripting attacks.

The Impact of CVE-2019-10404

The vulnerability could be exploited by users with control over certain parts of the reason for a blocked queue item, potentially leading to unauthorized access and data manipulation.

Technical Details of CVE-2019-10404

Jenkins' vulnerability details and affected systems.

Vulnerability Description

Jenkins versions 2.196 and earlier, as well as LTS 2.176.3 and earlier, failed to properly escape the reason for a blocked queue item in tooltips, enabling stored cross-site scripting attacks.

Affected Systems and Versions

Affected Versions: Jenkins 2.196 and earlier, LTS 2.176.3 and earlier
Vendor: Jenkins project

Exploitation Mechanism

The vulnerability could be exploited by users controlling parts of the reason for a blocked queue item, such as mismatched label expressions with idle executors.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2019-10404 vulnerability.

Immediate Steps to Take

Upgrade Jenkins to version 2.196 or later for non-LTS versions, and LTS 2.176.3 or later for LTS versions.
Monitor and restrict user access to critical parts of the system.

Long-Term Security Practices

Regularly update Jenkins to the latest versions to patch security vulnerabilities.
Educate users on secure coding practices to prevent cross-site scripting attacks.

Patching and Updates

Apply security patches provided by Jenkins to address known vulnerabilities and enhance system security.