CVE-2018-11408 : Security Advisory and Response

A security vulnerability in the Security component of Symfony versions 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11 allows for an Open redirect exploit when the security.http_utils is inlined by a container. This issue is a result of an incomplete fix for a previous CVE.

Understanding CVE-2018-11408

This CVE involves a security vulnerability in Symfony versions that could lead to an Open redirect exploit.

What is CVE-2018-11408?

The vulnerability in Symfony versions allows for an Open redirect exploit when certain conditions are met, posing a security risk to affected systems.

The Impact of CVE-2018-11408

The vulnerability could be exploited by attackers to redirect users to malicious websites, potentially leading to further security breaches or phishing attacks.

Technical Details of CVE-2018-11408

This section provides more technical insights into the CVE.

Vulnerability Description

The security handlers in Symfony versions 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11 are susceptible to an Open redirect vulnerability when security.http_utils is inlined by a container.

Affected Systems and Versions

Symfony 2.7.x before 2.7.48
Symfony 2.8.x before 2.8.41
Symfony 3.3.x before 3.3.17
Symfony 3.4.x before 3.4.11
Symfony 4.0.x before 4.0.11

Exploitation Mechanism

The vulnerability allows attackers to manipulate the security.http_utils inlined by a container to redirect users to malicious sites, exploiting the Open redirect flaw.

Mitigation and Prevention

Protecting systems from CVE-2018-11408 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Symfony to versions 2.7.48, 2.8.41, 3.3.17, 3.4.11, or 4.0.11 to patch the vulnerability.
Monitor and restrict user input that could be used to manipulate redirects.

Long-Term Security Practices

Regularly update Symfony and other software components to the latest secure versions.
Implement secure coding practices to prevent similar vulnerabilities in the future.

Patching and Updates

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