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Hashicorp Vault GCP IAM Integration Authentication Bypass

Hashicorp Vault GCP IAM Integration Authentication Bypass
Posted Oct 6, 2020
Authored by Google Security Research, Felix Wilhelm

HashiCorp Vault's GCP authentication method can be bypassed on gce type roles that do not specify bound_service_accounts. Vault does not enforce that the compute_engine data in a signed JWT token has any relationship to the service account that created the token. This makes it possible to impersonate arbitrary GCE instances, by creating a JWT token with a faked compute_engine struct, using an arbitrary attacker controlled service account.

tags | exploit, arbitrary
advisories | CVE-2020-16251
SHA-256 | 34f611b87b68b7fd6cab37412c7d4092e8b5a0d5ec0b29df2c510e9bc1a45ab4
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