CVE-2020-26138 : Security Advisory and Response

SilverStripe through 4.6.0-rc1 allows skipping validation for a FormField with square brackets in the field name.

Understanding CVE-2020-26138

In this CVE, a specific vulnerability in SilverStripe could lead to security issues due to a validation bypass.

What is CVE-2020-26138?

The vulnerability in SilverStripe through version 4.6.0-rc1 allows a FormField with square brackets in the field name to skip validation, potentially leading to security risks.

The Impact of CVE-2020-26138

This vulnerability could be exploited by attackers to manipulate form data and potentially bypass validation checks, compromising the integrity and security of the application.

Technical Details of CVE-2020-26138

SilverStripe through version 4.6.0-rc1 is affected by a specific vulnerability that allows skipping validation for FormFields with square brackets in the field name.

Vulnerability Description

The issue arises from a flaw in the validation process of FormFields, enabling malicious actors to evade validation by using square brackets in the field name.

Affected Systems and Versions

SilverStripe versions up to 4.6.0-rc1 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting form submissions with specially crafted field names containing square brackets to bypass validation mechanisms.

Mitigation and Prevention

To address CVE-2020-26138 and enhance security measures, follow these mitigation strategies:

Immediate Steps to Take

Update SilverStripe to a patched version that addresses the validation bypass issue.
Implement input validation and sanitization to prevent malicious input manipulation.

Long-Term Security Practices

Regularly monitor and audit form submissions for unusual patterns or malicious input.
Educate developers on secure coding practices to prevent similar vulnerabilities in the future.

Patching and Updates

Apply security patches provided by SilverStripe promptly to mitigate the vulnerability and enhance the security posture of the application.