CVE-2019-20174 : Exploit Details and Defense Strategies

Auth0 Lock versions prior to 11.21.0 are vulnerable to an XSS exploit when an untrusted placeholder is used with additionalSignUpFields.

Understanding CVE-2019-20174

An overview of the XSS vulnerability in Auth0 Lock versions.

What is CVE-2019-20174?

Auth0 Lock before version 11.21.0 is susceptible to cross-site scripting (XSS) attacks when combined with untrusted placeholders and additionalSignUpFields.

The Impact of CVE-2019-20174

The vulnerability allows attackers to execute malicious scripts in the context of a user's session, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2019-20174

Insight into the specifics of the vulnerability.

Vulnerability Description

An XSS flaw in Auth0 Lock versions prior to 11.21.0 enables attackers to inject and execute malicious scripts by leveraging untrusted placeholders with additionalSignUpFields.

Affected Systems and Versions

Product: Auth0 Lock
Vendor: Auth0
Vulnerable Versions: Before 11.21.0

Exploitation Mechanism

Attackers can exploit the vulnerability by inserting crafted input into the untrusted placeholder, triggering the execution of unauthorized scripts within the application.

Mitigation and Prevention

Measures to address and prevent the CVE-2019-20174 vulnerability.

Immediate Steps to Take

Upgrade Auth0 Lock to version 11.21.0 or later to mitigate the XSS risk.
Avoid using untrusted placeholders in conjunction with additionalSignUpFields.

Long-Term Security Practices

Regularly monitor and update security configurations to prevent XSS vulnerabilities.
Educate developers on secure coding practices to mitigate similar risks in the future.

Patching and Updates

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