CVE-2019-8336 Explained : Impact and Mitigation

In versions 1.4.x to 1.4.3 of HashiCorp Consul and Consul Enterprise, a vulnerability exists that allows a client to bypass access restrictions and gain the privileges of another token in secondary datacenters.

Understanding CVE-2019-8336

This CVE involves a security flaw in HashiCorp Consul and Consul Enterprise versions 1.4.x to 1.4.3.

What is CVE-2019-8336?

This vulnerability enables a client to evade intended access limitations and acquire the privileges of a different token in secondary datacenters by utilizing a token with a specific secret value in exceptional scenarios.

The Impact of CVE-2019-8336

The vulnerability can lead to unauthorized access and potential privilege escalation within the affected systems.

Technical Details of CVE-2019-8336

This section provides more technical insights into the CVE.

Vulnerability Description

HashiCorp Consul (and Consul Enterprise) versions 1.4.x before 1.4.3 allow a client to bypass access restrictions and gain the privileges of another arbitrary token within secondary datacenters by using a token with a specific secret value.

Affected Systems and Versions

Product: HashiCorp Consul and Consul Enterprise
Versions: 1.4.x to 1.4.3

Exploitation Mechanism

The vulnerability occurs due to the utilization of a token with a specific secret value in exceptional situations, enabling clients to bypass access restrictions.

Mitigation and Prevention

Protecting systems from CVE-2019-8336 is crucial to maintaining security.

Immediate Steps to Take

Update HashiCorp Consul and Consul Enterprise to versions beyond 1.4.3 to mitigate the vulnerability.
Monitor and restrict access to sensitive data and systems.

Long-Term Security Practices

Implement least privilege access controls to limit potential damage from unauthorized access.
Regularly review and update security configurations to address emerging threats.

Patching and Updates

Stay informed about security updates and patches released by HashiCorp.
Apply patches promptly to ensure systems are protected against known vulnerabilities.