GPUStack is an open-source GPU cluster manager for AI model serving and GPU instance provisioning

Why it is Amber

• CVSS 9.8 critical
• Remotely exploitable without logging in

References

• https://github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48d
• https://github.com/gpustack/gpustack/pull/5346
• https://github.com/gpustack/gpustack/releases/tag/v2.2.0
• https://github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhr

Original description

GPUStack is an open-source GPU cluster manager for AI model serving and GPU instance provisioning. Prior to 2.2.0, get_current_user in gpustack/api/auth.py treated a loopback request source as the built-in administrator when force_auth_localhost was false, which was the default. A remote request could appear to originate from 127.0.0.1 because client_ip_getter accepted a same-host reverse proxy peer or a client-supplied X-GPUStack-Real-IP loopback value. The bypass allowed unauthenticated administrative access, including user and model changes, persistent administrator API-key creation, disclosure of worker and cloud-provider secrets, and code execution through POST /v2/inference-backends/from-yaml. Exploitation was observed in the wild against a 2.1.1 deployment. This issue is fixed in version 2.2.0.