CVE-2021-39109 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2021-39109, a vulnerability in Atlassian's Atlasboard that allows remote attackers to read arbitrary files via path traversal.

Understanding CVE-2021-39109

CVE-2021-39109 is a security vulnerability in Atlasian Atlasboard before version 1.1.9 that enables remote attackers to access files through a path traversal exploit.

What is CVE-2021-39109?

The vulnerability in Atlasboard, identified as CVE-2021-39109, permits remote attackers to read any files on the system using a path traversal technique.

The Impact of CVE-2021-39109

This vulnerability could lead to sensitive data exposure, unauthorized access to files, and potential manipulation of critical files on the affected system.

Technical Details of CVE-2021-39109

CVE-2021-39109 has the following technical details:

Vulnerability Description

The renderWidgetResource resource in Atlasian Atlasboard before version 1.1.9 is susceptible to a path traversal vulnerability, allowing unauthorized access to files.

Affected Systems and Versions

Product: Atlasboard
Vendor: Atlassian
Versions Affected: < 1.1.9 (Custom versions)

Exploitation Mechanism

The vulnerability can be exploited by sending specially crafted requests to the renderWidgetResource resource, enabling attackers to navigate through file paths and read sensitive information.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-39109, consider the following steps:

Immediate Steps to Take

Upgrade Atlasboard to version 1.1.9 or newer to address the vulnerability.
Implement network segmentation to restrict access to vulnerable components.

Long-Term Security Practices

Regularly monitor and audit file access and permissions.
Conduct security training for developers to raise awareness of secure coding practices.

Patching and Updates

Keep software and systems up to date with security patches to prevent such vulnerabilities.