CVE-2017-15568 : Security Advisory and Response

A vulnerability related to cross-site scripting (XSS) was discovered in Redmine versions prior to 3.2.8, 3.3.x prior to 3.3.5, and 3.4.x prior to 3.4.3. This vulnerability occurs in the file app/helpers/application_helper.rb, specifically in the handling of a multi-value field with a manipulated value. When rendering the issue history, this manipulated value is mishandled and could lead to XSS.

Understanding CVE-2017-15568

This CVE involves a cross-site scripting vulnerability in specific versions of Redmine.

What is CVE-2017-15568?

CVE-2017-15568 is a security vulnerability in Redmine that allows for cross-site scripting attacks due to mishandling of manipulated values in a multi-value field.

The Impact of CVE-2017-15568

This vulnerability could be exploited by attackers to execute malicious scripts in the context of a user's browser, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2017-15568

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability exists in Redmine versions before 3.2.8, 3.3.x before 3.3.5, and 3.4.x before 3.4.3, specifically in the file app/helpers/application_helper.rb.

Affected Systems and Versions

Redmine versions prior to 3.2.8
Redmine 3.3.x versions prior to 3.3.5
Redmine 3.4.x versions prior to 3.4.3

Exploitation Mechanism

The vulnerability arises from the mishandling of manipulated values in a multi-value field during the rendering of issue history, allowing for the execution of XSS attacks.

Mitigation and Prevention

Protecting systems from CVE-2017-15568 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Redmine to versions 3.2.8, 3.3.5, or 3.4.3 or later to mitigate the vulnerability.
Implement input validation mechanisms to sanitize user inputs and prevent XSS attacks.

Long-Term Security Practices

Regularly monitor and update software to patch known vulnerabilities.
Educate users and developers on secure coding practices to prevent similar issues.

Patching and Updates

Apply security patches provided by Redmine promptly to address the XSS vulnerability.