CVE-2019-18413 : Security Advisory and Response

CVE-2019-18413 is a vulnerability in the validate() function of TypeStack class-validator 0.10.2, potentially allowing bypassing input validation and enabling attackers to inject malicious input for SQL Injection or XSS attacks.

Understanding CVE-2019-18413

What is CVE-2019-18413?

The vulnerability in TypeStack class-validator 0.10.2 allows overwriting internal attributes using a conflicting name, potentially bypassing input validation.

The Impact of CVE-2019-18413

Exploiting this vulnerability can lead to the injection of arbitrary malicious input, enabling attackers to carry out SQL Injection or XSS attacks.

Technical Details of CVE-2019-18413

Vulnerability Description

The validate() function in TypeStack class-validator 0.10.2 may be vulnerable to bypassing input validation due to the ability to overwrite certain internal attributes using a conflicting name.
The forbidUnknownValues parameter can mitigate this bypass, but it is not documented, leading many developers to use the default configuration, which is vulnerable.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: n/a (affected)

Exploitation Mechanism

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality Impact: None
Integrity Impact: Low
Availability Impact: None
Base Score: 3.7 (Low)

Mitigation and Prevention

Immediate Steps to Take

Implement the forbidUnknownValues parameter to mitigate the vulnerability.
Regularly monitor and update the class-validator library to the latest version.

Long-Term Security Practices

Conduct regular security audits and code reviews to identify and address vulnerabilities.
Educate developers on secure coding practices to prevent similar issues in the future.

Patching and Updates

Stay informed about security advisories and patches released by TypeStack to address this vulnerability.