CVE-2018-19790 : What You Need to Know

A vulnerability was found in Symfony versions 2.7.x through 2.7.50, 2.8.x through 2.8.49, 3.x through 3.4.20, 4.0.x through 4.0.15, 4.1.x through 4.1.9, and 4.2.x through 4.2.1. This vulnerability allows an attacker to bypass the redirection target restrictions by utilizing backslashes in the

_failure_path

input field of login forms. As a result, the attacker can effectively redirect the user to any domain after the login process.

Understanding CVE-2018-19790

An open redirect vulnerability in Symfony versions that allows attackers to redirect users to any domain post-login.

What is CVE-2018-19790?

This CVE identifies an open redirect vulnerability in various Symfony versions, enabling attackers to redirect users to malicious domains after login.

The Impact of CVE-2018-19790

The vulnerability permits attackers to bypass redirection restrictions, potentially leading to phishing attacks or unauthorized access to sensitive information.

Technical Details of CVE-2018-19790

Details regarding the vulnerability, affected systems, and exploitation methods.

Vulnerability Description

The vulnerability in Symfony versions allows attackers to manipulate the

_failure_path

input field to redirect users to unauthorized domains.

Affected Systems and Versions

Symfony 2.7.x through 2.7.50
Symfony 2.8.x through 2.8.49
Symfony 3.x through 3.4.20
Symfony 4.0.x through 4.0.15
Symfony 4.1.x through 4.1.9
Symfony 4.2.x through 4.2.1

Exploitation Mechanism

Attackers exploit the vulnerability by inserting backslashes in the

_failure_path

field of login forms to redirect users to unauthorized domains.

Mitigation and Prevention

Steps to mitigate the CVE-2018-19790 vulnerability and enhance system security.

Immediate Steps to Take

Update Symfony to the latest patched version.
Implement input validation to prevent malicious input manipulation.
Monitor and restrict redirections within the application.

Long-Term Security Practices

Regularly update and patch Symfony to address security vulnerabilities.
Conduct security audits and penetration testing to identify and mitigate potential risks.
Educate users and administrators about phishing and social engineering tactics.

Patching and Updates

Apply security patches provided by Symfony promptly to address the open redirect vulnerability.