CVE-2021-43949 : Exploit Details and Defense Strategies

Atlassian's Jira Service Management Server and Data Center versions before 4.21.0 are susceptible to an authenticated remote attack via Broken Access Control in Custom Fields.

Understanding CVE-2021-43949

This CVE identifies a critical vulnerability in Atlassian's Jira Service Management Server and Data Center.

What is CVE-2021-43949?

The issue allows authenticated remote attackers to access private objects by exploiting a Broken Access Control flaw in the Custom Fields feature.

The Impact of CVE-2021-43949

Exploitation of this vulnerability can lead to unauthorized access to sensitive information, compromising data confidentiality and integrity.

Technical Details of CVE-2021-43949

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw enables authenticated remote attackers to view private objects due to a Broken Access Control vulnerability in the Custom Fields feature.

Affected Systems and Versions

Atlassian Jira Service Management Server before version 4.21.0
Atlassian Jira Service Management Data Center before version 4.21.0

Exploitation Mechanism

Attackers with authenticated access can exploit the vulnerability to gain unauthorized access to private objects through the Custom Fields feature.

Mitigation and Prevention

Protective steps to address and prevent exploitation of the vulnerability.

Immediate Steps to Take

Upgrade affected systems to version 4.21.0 or above
Monitor and restrict access to sensitive information
Implement least privilege access controls

Long-Term Security Practices

Regular security training for staff on access control best practices
Conduct regular security assessments and audits
Stay informed about security updates and patches
Utilize security monitoring tools

Patching and Updates

Apply the latest security patches provided by Atlassian
Keep systems updated with the latest software releases