CVE-2020-4027 : Vulnerability Insights and Analysis

Atlassian Confluence Server and Data Center versions before 7.4.5 and from 7.5.0 before 7.5.1 are vulnerable to an injection flaw in custom user macros.

Understanding CVE-2020-4027

This CVE involves a vulnerability in Atlassian Confluence Server and Data Center that could allow remote attackers to bypass security measures.

What is CVE-2020-4027?

The CVE-2020-4027 vulnerability in Atlassian Confluence Server and Data Center enables attackers with system administration permissions to exploit an injection vulnerability in custom user macros, potentially leading to security breaches.

The Impact of CVE-2020-4027

The vulnerability allows remote attackers to bypass velocity template injection mitigations, posing a risk to the confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2020-4027

This section provides more in-depth technical information about the CVE-2020-4027 vulnerability.

Vulnerability Description

The vulnerability in Atlassian Confluence Server and Data Center versions before 7.4.5 and from 7.5.0 before 7.5.1 allows for the bypassing of velocity template injection mitigations through an injection flaw in custom user macros.

Affected Systems and Versions

Atlassian Confluence Server versions before 7.4.5
Atlassian Confluence Server versions from 7.5.0 before 7.5.1

Exploitation Mechanism

Attackers with system administration permissions can exploit the injection vulnerability in custom user macros to execute malicious code and potentially compromise the affected systems.

Mitigation and Prevention

To address the CVE-2020-4027 vulnerability, follow these mitigation and prevention strategies:

Immediate Steps to Take

Upgrade Atlassian Confluence Server and Data Center to version 7.4.5 or higher.
Implement strict access controls to limit system administration permissions.
Regularly monitor and audit custom user macros for suspicious activities.

Long-Term Security Practices

Conduct regular security training for system administrators and users on identifying and reporting potential security threats.
Keep systems and software up to date with the latest security patches and updates.

Patching and Updates

Apply security patches provided by Atlassian promptly to address the vulnerability and enhance system security.