CVE-2020-5401 Explained : Impact and Mitigation

Cloud Foundry GoRouter is vulnerable to cache poisoning.

Understanding CVE-2020-5401

Cloud Foundry Routing Release, versions prior to 0.197.0, contains GoRouter, allowing malicious clients to send invalid headers, leading to caching layers rejecting legitimate clients.

What is CVE-2020-5401?

Vulnerability in Cloud Foundry GoRouter affecting versions before 0.197.0
Malicious clients can exploit this to disrupt access to the app

The Impact of CVE-2020-5401

CVSS Score: 5.3 (Medium Severity)
Attack Complexity: Low
Attack Vector: Network
Availability Impact: Low
No impact on Confidentiality or Integrity

Technical Details of CVE-2020-5401

Vulnerability Description

GoRouter in Cloud Foundry Routing Release allows sending invalid headers
Results in caching layers rejecting legitimate clients

Affected Systems and Versions

Product: Routing
Vendor: Cloud Foundry
Versions Affected: < 0.197.0

Exploitation Mechanism

Malicious clients exploit GoRouter to send invalid headers
Caching layers then block legitimate clients

Mitigation and Prevention

Immediate Steps to Take

Update Cloud Foundry Routing to version 0.197.0 or higher
Monitor and restrict network traffic to GoRouter

Long-Term Security Practices

Regularly update and patch Cloud Foundry components
Implement network security measures to detect and prevent similar attacks

Patching and Updates

Apply patches and updates provided by Cloud Foundry to address the vulnerability