CVE-2021-39117 : Vulnerability Insights and Analysis

This CVE-2021-39117 article provides details about a Cross-Site Scripting (XSS) vulnerability affecting Atlassian Jira Server and Data Center.

Understanding CVE-2021-39117

This section delves into the specifics of the CVE-2021-39117 vulnerability affecting Atlassian products.

What is CVE-2021-39117?

The AssociateFieldToScreens page in Atlassian Jira Server and Data Center before version 8.18.0 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability through the name of a custom field.

The Impact of CVE-2021-39117

The vulnerability enables remote attackers to execute malicious scripts, potentially leading to unauthorized data access, sensitive information disclosure, and overall system compromise.

Technical Details of CVE-2021-39117

Explore the technical aspects of the CVE-2021-39117 vulnerability in this section.

Vulnerability Description

The vulnerability in Atlassian Jira Server and Data Center before version 8.18.0 permits remote attackers to introduce malicious HTML or JavaScript code via XSS through a custom field's name.

Affected Systems and Versions

Product: Jira Server
Vendor: Atlassian
Affected Versions: < 8.18.0 (unspecified custom versions)
Product: Jira Data Center
Vendor: Atlassian
Affected Versions: < 8.18.0 (unspecified custom versions)

Exploitation Mechanism

The vulnerability relies on injecting malicious scripts through the custom field name, exploiting the lack of proper input validation.

Mitigation and Prevention

Discover the steps to mitigate and prevent exploitation of CVE-2021-39117.

Immediate Steps to Take

Upgrade Atlassian Jira Server and Jira Data Center to version 8.18.0 or later.
Implement proper input validation for custom field names to prevent XSS attacks.
Regularly monitor and audit custom field configurations for malicious entries.

Long-Term Security Practices

Educate users on safe data handling practices to prevent XSS vulnerabilities.
Employ security testing procedures, including regular vulnerability assessments and code reviews.

Patching and Updates

Atlassian has released version 8.18.0 addressing the CVE-2021-39117 vulnerability. Ensure timely patching and updates to safeguard systems from potential exploits.