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Hashicorp Vault AWS IAM Integration Authentication Bypass

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

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.

tags | exploit, arbitrary, spoof
advisories | CVE-2020-16250
SHA-256 | b13c4db73c9c1c434d36ca980312a9413268770cfb76417ed250b35bd357b407
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