IQID:21925 HTTP Hashicorp Vault AWS IAM Integration Authentication Bypass (CVE-2020-16250) S

IQID: 21925 - October 2020

HashiCorp Vault's AWS IAM authentication method can be bypassed by sending a serialized request to the STS AssumeRoleWithWebIdentity method as part of the authentication flow. The request triggers a JSON encoded response from the STS server, which can contain a fully-attacker controlled fake GetCallerIdentityResponse as part of its body. As the Vault response parser ignores non-xml content before and after the malicious response, this can be used to spoof arbitrary AWS identities and roles.

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