CVE-2021-43289 : Exploit Details and Defense Strategies

An issue was discovered in ThoughtWorks GoCD before 21.3.0 where an attacker could upload a malicious file into an arbitrary directory of a GoCD server.

Understanding CVE-2021-43289

This CVE identifies a security vulnerability in ThoughtWorks GoCD that allows an attacker with compromised access to execute a file upload attack on a GoCD server.

What is CVE-2021-43289?

The vulnerability in ThoughtWorks GoCD before version 21.3.0 enables an attacker to upload a malicious file into any directory of a GoCD server without controlling the filename.

The Impact of CVE-2021-43289

This vulnerability can lead to the possible execution of harmful actions on the GoCD server, posing a threat to data confidentiality and system integrity.

Technical Details of CVE-2021-43289

This section provides a deeper look into the technical aspects of the CVE.

Vulnerability Description

The issue allows a compromised GoCD agent to upload a malicious file into an arbitrary server directory.

Affected Systems and Versions

Product: ThoughtWorks GoCD
Versions affected: All versions before 21.3.0

Exploitation Mechanism

The vulnerability enables an attacker to upload a harmful file without controlling the filename, potentially leading to unauthorized access or data manipulation.

Mitigation and Prevention

Protect your systems from CVE-2021-43289 with the following measures.

Immediate Steps to Take

Update GoCD to version 21.3.0 or above to mitigate the vulnerability.
Review and restrict agent permissions for file uploads.
Monitor directory changes for suspicious activities.

Long-Term Security Practices

Implement role-based access control to limit agent capabilities.
Conduct regular security audits and penetration testing.

Patching and Updates

Ensure timely application of security patches and updates to prevent exploitation of known vulnerabilities.