CVE-2019-9764 : Exploit Details and Defense Strategies

HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication, potentially exposing systems to security risks. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2019-9764

HashiCorp Consul 1.4.3 vulnerability with TLS communication

What is CVE-2019-9764?

The issue in HashiCorp Consul 1.4.3 allows agent-to-agent TLS communication without proper server hostname verification, even when the verification option is enabled, leading to potential security vulnerabilities.

The Impact of CVE-2019-9764

Lack of server hostname verification in TLS communication
Risk of man-in-the-middle attacks
Potential exposure of sensitive data

Technical Details of CVE-2019-9764

Details of the vulnerability

Vulnerability Description

HashiCorp Consul 1.4.3 does not enforce server hostname verification for agent-to-agent TLS communication
The product behaves as if the verify_server_hostname option is disabled, even when it is enabled

Affected Systems and Versions

Product: HashiCorp Consul
Version: 1.4.3

Exploitation Mechanism

Attackers can intercept and manipulate agent-to-agent communication without proper hostname verification

Mitigation and Prevention

Protecting systems from CVE-2019-9764

Immediate Steps to Take

Upgrade to version 1.4.4 of HashiCorp Consul to address the vulnerability
Implement network segmentation to limit exposure

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities
Monitor network traffic for suspicious activities

Patching and Updates

Apply security patches promptly to ensure system integrity and protection