GHSA-rqm8-q8j9-662f: Nomad Job Submitter Privilege Escalation Using Workload Identity

1. GitHub Advisory Database
2. GitHub Reviewed
3. CVE-2023-1299

Nomad Job Submitter Privilege Escalation Using Workload Identity

High severity GitHub Reviewed Published Mar 14, 2023 to the GitHub Advisory Database • Updated Mar 14, 2023

Package

gomod github.com/hashicorp/nomad (Go)

Affected versions

= 1.5.0

Summary

A vulnerability was identified in Nomad and Nomad Enterprise (“Nomad”) such that a user with the submit-job ACL capability can submit a job that can escalate to management-level privileges. This vulnerability, CVE-2023-1299, was introduced in Nomad 1.5.0 and fixed in Nomad 1.5.1.

Background

Nomad 1.4.0 introduced the concept of workload identity so that tasks can access variables without needing to access them through Nomad HTTP API with an ACL token.

In 1.5.0, the identity block was introduced, which exposes the workload identity token to the workload so it can access Nomad HTTP API via a unix domain socket without configuring mTLS.

Details

During internal testing, we discovered it was possible to abuse the workload identity to elevate to management-level privilege if the workload identity did not have any attached ACL policies.

Remediation

Customers should evaluate the risk associated with this issue and consider upgrading to Nomad 1.5.1 or newer. See Nomad’s Upgrading for general guidance on this process.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-1299
• https://discuss.hashicorp.com/t/hcsec-2023-08-nomad-job-submitter-privilege-escalation-using-workload-identity/51389

Published by the National Vulnerability Database

Mar 14, 2023

Published to the GitHub Advisory Database

Mar 14, 2023

Last updated

Mar 14, 2023