CVE-2021-41865 : What You Need to Know

HashiCorp Nomad and Nomad Enterprise versions 1.1.1 through 1.1.5 allowed authenticated users to cause denial of service by submitting incomplete job specifications using Consul mesh gateway and host networking mode. Fixed in 1.1.6.

Understanding CVE-2021-41865

HashiCorp Nomad and Nomad Enterprise were vulnerable to denial of service attacks through incomplete job submissions.

What is CVE-2021-41865?

CVE-2021-41865 refers to a vulnerability in HashiCorp Nomad and Nomad Enterprise versions 1.1.1 to 1.1.5, enabling authenticated users to disrupt services by submitting incomplete job specifications using specific network configurations.

The Impact of CVE-2021-41865

The vulnerability allowed authenticated users with job submission capabilities to launch denial of service attacks, impacting service availability and reliability.

Technical Details of CVE-2021-41865

HashiCorp Nomad vulnerability details.

Vulnerability Description

Users with job submission abilities could exploit the vulnerability by submitting partial job specifications through Consul mesh gateway and host networking mode, leading to denial of service.

Affected Systems and Versions

HashiCorp Nomad and Nomad Enterprise versions 1.1.1 to 1.1.5

Exploitation Mechanism

Authenticated users submitted incomplete job specifications using a Consul mesh gateway and host networking mode to disrupt services.

Mitigation and Prevention

Steps to address CVE-2021-41865.

Immediate Steps to Take

Update Nomad and Nomad Enterprise to version 1.1.6 to patch the vulnerability.
Monitor and restrict job submissions to prevent unauthorized or incomplete specifications.

Long-Term Security Practices

Conduct regular security audits and code reviews to detect and address vulnerabilities promptly.

Patching and Updates

Stay informed about security advisories from HashiCorp and apply patches promptly to secure systems.