CVE-2018-1000193 : Security Advisory and Response

A vulnerability in Jenkins versions 2.120 and older, as well as LTS versions 2.107.2 and older, allows users to sign up using usernames containing control characters, leading to potential security risks.

Understanding CVE-2018-1000193

This CVE identifies a specific vulnerability in Jenkins that affects user sign-up processes.

What is CVE-2018-1000193?

The vulnerability in the HudsonPrivateSecurityRealm.java file allows users to create usernames with control characters, potentially causing confusion with other users and preventing deletion through the user interface.

The Impact of CVE-2018-1000193

The vulnerability results from the improper neutralization of control sequences, posing a risk of user misidentification and potential security breaches.

Technical Details of CVE-2018-1000193

This section provides detailed technical insights into the CVE.

Vulnerability Description

The vulnerability allows users to create usernames with control characters, leading to confusion and potential security threats.

Affected Systems and Versions

Jenkins versions 2.120 and older
LTS versions 2.107.2 and older

Exploitation Mechanism

The vulnerability arises from the improper handling of control characters in user sign-up processes.

Mitigation and Prevention

Protecting systems from CVE-2018-1000193 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Jenkins to the latest version that includes a patch for this vulnerability.
Monitor user sign-up activities for suspicious usernames.

Long-Term Security Practices

Educate users on creating secure usernames without control characters.
Implement regular security audits to identify and address similar vulnerabilities.

Patching and Updates

Regularly check for Jenkins security advisories and apply patches promptly to mitigate known vulnerabilities.