CVE-2021-43940 : What You Need to Know

A DLL Hijacking vulnerability in Atlassian Confluence Server and Data Center enables local attackers to elevate privileges on Windows systems.

Understanding CVE-2021-43940

What is CVE-2021-43940?

Affected versions of Atlassian Confluence Server and Data Center allow authenticated local attackers to achieve elevated privileges on the local system through DLL Hijacking. This vulnerability is specific to Windows installations.

The Impact of CVE-2021-43940

The vulnerability grants local attackers elevated privileges on the Windows system, leading to potential security breaches and unauthorized access.

Technical Details of CVE-2021-43940

Vulnerability Description

The flaw in Confluence Server and Data Center installations on Windows permits DLL Hijacking, posing a security risk for the affected versions.

Affected Systems and Versions

Atlassian Confluence Server versions prior to 7.4.10
Atlassian Confluence Server versions 7.5.0 to 7.12.3
Atlassian Confluence Data Center versions prior to 7.4.10
Atlassian Confluence Data Center versions 7.5.0 to 7.12.3

Exploitation Mechanism

The vulnerability allows local attackers to manipulate DLL loading by planting malicious DLLs, exploiting the Confluence installer process.

Mitigation and Prevention

Immediate Steps to Take

Upgrade Confluence Server and Data Center to version 7.4.10 or above
Monitor and restrict access to the affected systems
Employ endpoint protection to detect and prevent DLL Hijacking

Long-Term Security Practices

Regularly update and patch Confluence Server and Data Center
Conduct security training for staff on DLL Hijacking and related vulnerabilities
Implement secure configuration practices to mitigate DLL-related risks

Patching and Updates

Make sure to apply security patches released by Atlassian promptly to address the DLL Hijacking vulnerability in Confluence Server and Data Center.