CVE-2019-20894 : Exploit Details and Defense Strategies
Learn about CVE-2019-20894 affecting Traefik 2.x, allowing HTTPS sessions without mutual TLS verification, potentially leading to unauthorized access. Find mitigation steps and prevention measures.
Traefik 2.x can allow HTTPS sessions to proceed without mutual TLS verification, potentially bypassing ERR_BAD_SSL_CLIENT_AUTH_CERT errors.
Understanding CVE-2019-20894
In specific setups, Traefik 2.x can enable HTTPS sessions to proceed even when mutual TLS verification should have triggered an ERR_BAD_SSL_CLIENT_AUTH_CERT error.
What is CVE-2019-20894?
Traefik 2.x, in certain configurations, allows HTTPS sessions to proceed without mutual TLS verification in a situation where ERR_BAD_SSL_CLIENT_AUTH_CERT should have occurred.
The Impact of CVE-2019-20894
This vulnerability could lead to unauthorized access and potential security breaches due to the lack of proper mutual TLS verification.
Technical Details of CVE-2019-20894
Vulnerability Description
Traefik 2.x can bypass mutual TLS verification, potentially allowing unauthorized HTTPS sessions.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Version: Not applicable
Exploitation Mechanism
The vulnerability can be exploited in specific configurations of Traefik 2.x to allow HTTPS sessions without proper mutual TLS verification.
Mitigation and Prevention
Immediate Steps to Take
- Review and update Traefik configurations to ensure proper mutual TLS verification.
- Monitor HTTPS sessions for any unauthorized access.
Long-Term Security Practices
- Regularly review and update TLS configurations.
- Implement strict access controls and monitoring mechanisms.
Patching and Updates
- Apply patches or updates provided by Traefik to address this vulnerability.