CVE-2021-29481 Explained : Impact and Mitigation

Ratpack, a toolkit for creating web applications, versions prior to 1.9.0 have a vulnerability. The default configuration of client-side sessions allows unencrypted data to be set as cookie values, potentially exposing sensitive information.

Understanding CVE-2021-29481

This CVE highlights a vulnerability in the way client-side sessions are handled in Ratpack versions prior to 1.9.0.

What is CVE-2021-29481?

In Ratpack versions before 1.9.0, client-side sessions store unencrypted but signed data as cookie values, which could lead to sensitive data exposure if the session cookie leaks.

The Impact of CVE-2021-29481

The vulnerability poses a medium severity risk with a base score of 6.5. It has a high impact on confidentiality as sensitive data stored in sessions could be accessed by unauthorized parties.

Technical Details of CVE-2021-29481

The technical details of this CVE include vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The issue arises from storing unencrypted data in cookie values, making it accessible to unauthorized individuals if the session cookie is compromised.

Affected Systems and Versions

Ratpack versions prior to 1.9.0 are affected by this vulnerability.

Exploitation Mechanism

If sensitive data is stored in the session and the session cookie is exposed, it could be accessed by malicious actors, especially in scenarios like XSS vulnerabilities.

Mitigation and Prevention

It is crucial to take immediate steps to secure systems and follow long-term security practices.

Immediate Steps to Take

Ensure sessions are configured securely, and consider supplying an encryption key as a workaround.

Long-Term Security Practices

Regularly update Ratpack to version 1.9.0 or newer, where a securely randomly generated signing key is used.

Patching and Updates

Stay informed about security advisories and apply patches promptly to mitigate this vulnerability.