CVE-2021-39121 Explained : Impact and Mitigation

This CVE-2021-39121 article provides insights into an Information Disclosure vulnerability affecting Atlassian Jira Server and Data Center.

Understanding CVE-2021-39121

This section delves into the details of the CVE-2021-39121 vulnerability.

What is CVE-2021-39121?

CVE-2021-39121 is an Information Disclosure vulnerability in Atlassian Jira Server and Data Center. Authenticated remote attackers can exploit this flaw to enumerate private Jira project keys via the /rest/api/latest/projectvalidate/key endpoint.

The Impact of CVE-2021-39121

The vulnerability allows attackers to retrieve private project details, posing a risk to confidentiality and potentially sensitive information stored in Jira instances.

Technical Details of CVE-2021-39121

This section outlines the technical aspects of CVE-2021-39121.

Vulnerability Description

The vulnerability allows authenticated remote attackers to disclose information by enumerating private project keys in Jira instances.

Affected Systems and Versions

Atlassian Jira Server versions prior to 8.5.18, between 8.6.0 and 8.13.10, and between 8.14.0 and 8.18.2 are affected.
Atlassian Jira Data Center versions matching the affected Jira Server versions are also vulnerable.

Exploitation Mechanism

Attackers can exploit the vulnerability by sending crafted requests to the /rest/api/latest/projectvalidate/key endpoint, leading to unauthorized access to private project keys.

Mitigation and Prevention

Protect your systems from CVE-2021-39121 with the following measures.

Immediate Steps to Take

Upgrade affected Jira Server and Data Center instances to the patched versions.
Monitor logs and network traffic for any abnormal activities.

Long-Term Security Practices

Implement strict access controls to limit exposure to sensitive project keys.
Regularly update and patch Atlassian Jira installations to address security vulnerabilities.

Patching and Updates

Atlassian has released patches for the affected versions. Ensure timely application to safeguard against potential exploits.