CVE-2021-39128 : Security Advisory and Response

This CVE involves a vulnerability in Atlassian Jira Server and Data Center that could allow remote attackers with JIRA Administrators access to execute arbitrary Java code, posing a security risk to affected systems.

Understanding CVE-2021-39128

This section provides insight into the key details of the CVE-2021-39128 vulnerability in Atlassian Jira Server and Data Center.

What is CVE-2021-39128?

Affected versions of Atlassian Jira Server or Data Center utilizing the Jira Service Management addon are susceptible to a server-side template injection vulnerability in the Email Template feature. Attackers with JIRA Administrators access can exploit this vulnerability to execute arbitrary Java code.

The Impact of CVE-2021-39128

The security issue in CVE-2021-39128 can have severe consequences:

Remote attackers can execute arbitrary Java code.
They can access systems with JIRA Administrator privileges, leading to potential data breaches and system compromise.

Technical Details of CVE-2021-39128

This section provides deeper technical insights into the CVE-2021-39128 vulnerability.

Vulnerability Description

The vulnerability arises due to the lack of proper neutralization of special elements used in template engines, allowing the injection of malicious Java code.

Affected Systems and Versions

The following versions of Atlassian products are impacted:

Jira Server before 8.13.12, from 8.14.0 before 8.19.1
Jira Data Center before 8.13.12, from 8.14.0 before 8.19.1

Exploitation Mechanism

Attackers with JIRA Administrators access can exploit the server-side template vulnerability in the Email Template feature to inject and execute arbitrary Java code.

Mitigation and Prevention

Protecting systems from CVE-2021-39128 requires immediate actions and long-term security practices.

Immediate Steps to Take

Take the following steps to mitigate the vulnerability:

Update the Atlassian Jira Server and Data Center to versions 8.13.12, 8.14.0, and 8.19.1 or higher.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Implement these practices to enhance security:

Conduct regular security audits and penetration testing.
Educate users on recognizing and reporting suspicious activities.

Patching and Updates

Regularly apply software patches and updates provided by Atlassian to mitigate known vulnerabilities and enhance system security.