CVE-2020-5416 Explained : Impact and Mitigation
Learn about CVE-2020-5416 affecting Cloud Foundry Routing with NGINX, allowing DoS attacks. Find mitigation steps and long-term security practices to safeguard your systems.
Cloud Foundry Routing (Gorouter) versions prior to 0.204.0, when used with NGINX reverse proxies, may be vulnerable to denial-of-service attacks.
Understanding CVE-2020-5416
Cloud Foundry clusters with NGINX in front of them could be susceptible to DoS attacks.
What is CVE-2020-5416?
- Vulnerability in Cloud Foundry Routing (Gorouter) before version 0.204.0 when deployed with NGINX reverse proxies
- Allows unauthenticated attackers to send crafted HTTP requests causing Gorouters to be dropped from NGINX backend pool
The Impact of CVE-2020-5416
- CVSS v3.0 Base Score: 7.7 (High Severity)
- Attack Vector: Network, Attack Complexity: Low
- Availability Impact: High, Scope: Changed
- CWE-404: Improper Resource Shutdown or Release
Technical Details of CVE-2020-5416
Cloud Foundry Routing vulnerability details
Vulnerability Description
- Vulnerability in Cloud Foundry Routing (Gorouter) versions prior to 0.204.0
- Risk of DoS attacks when used with NGINX reverse proxies
Affected Systems and Versions
- Cloud Foundry Routing (Gorouter) < 0.204.0
- CF Deployment < 13.13.0
Exploitation Mechanism
- Unauthenticated attackers can exploit by sending specially-crafted HTTP requests
Mitigation and Prevention
Protecting systems from CVE-2020-5416
Immediate Steps to Take
- Update Cloud Foundry Routing to version 0.204.0 or higher
- Implement network-level protections to filter malicious traffic
Long-Term Security Practices
- Regularly monitor and audit network traffic for anomalies
- Keep software and security configurations up to date
Patching and Updates
- Apply patches and updates promptly to mitigate vulnerabilities