CVE-2021-28661 Explained : Impact and Mitigation

SilverStripe GraphQL Server (silverstripe/graphql) version 3.x through 3.4.1 is impacted by a vulnerability where the permission checker is not inherited by the query subclass.

Understanding CVE-2021-28661

This section will cover what CVE-2021-28661 is, its impact, technical details, and mitigation strategies.

What is CVE-2021-28661?

The vulnerability in Default SilverStripe GraphQL Server (silverstripe/graphql) version 3.x through 3.4.1 allows unauthorized access due to the permission checker not being inherited by the query subclass.

The Impact of CVE-2021-28661

The vulnerability can lead to unauthorized users executing queries which could compromise sensitive data or perform malicious actions on the affected system.

Technical Details of CVE-2021-28661

This section will detail the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

Default SilverStripe GraphQL Server version 3.x through 3.4.1 fails to enforce permission checks inherited by the query subclass, allowing unauthorized access.

Affected Systems and Versions

All versions of Default SilverStripe GraphQL Server (silverstripe/graphql) 3.x through 3.4.1 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious queries to bypass permission checks and access unauthorized data.

Mitigation and Prevention

To protect systems from CVE-2021-28661, immediate steps should be taken along with long-term security practices.

Immediate Steps to Take

Update SilverStripe GraphQL Server to a patched version that enforces permission checks properly.
Monitor system logs for any suspicious activity indicating unauthorized access.

Long-Term Security Practices

Regularly audit and update security configurations to prevent similar vulnerabilities in the future.
Implement strict access controls and user permissions to limit unauthorized actions.

Patching and Updates

Stay informed about security releases and apply patches promptly to address known vulnerabilities.