OpenCost before 1.121.0 fails to authenticate the GET /helmValues endpoint, exposing base64-decoded HELM_VALUES environment variable containing cloud provider credentials. Additionally, adminAuthMiddleware fails open when ADMIN_TOKEN is unset, allowing unauthenticated attackers to modify GCP service account keys via POST /serviceKey to redirect billing calls.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
opencost:opencost
References 5
https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6a…
disclosure@vulncheck.com
https://github.com/opencost/opencost/issues/3893
disclosure@vulncheck.com
https://github.com/opencost/opencost/pull/3910
disclosure@vulncheck.com
https://github.com/opencost/opencost/releases/tag/core/v1.121.0
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-expos…
disclosure@vulncheck.com