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GHSA-jp7h-4f3c-9rc7
No affected components available
Impact
This is a cross-account impersonation vulnerability in the auth-aws plugin. The vulnerability allows an IAM role from an untrusted AWS account to authenticate by impersonating a role with the same name in a trusted account, leading to unauthorized access.
This impacts all users of the auth-aws plugin who operate in a multi-account AWS environment where IAM role names may not be unique across accounts.
The core of the vulnerability is a flawed caching mechanism that fails to validate the AWS Account ID during authentication. While the use of wildcards in a bound_iam_principal_arn configuration significantly increases the attack surface, wildcards are not a prerequisite for exploitation. The vulnerability can be exploited with specific ARN bindings if a role name collision occurs.
Successful exploitation can lead to unauthorized access to secrets, data exfiltration, and privilege escalation. Given that the only prerequisite is a duplicate role name, the severity is considered high.
Patches
This vulnerability has been patched in version 0.1.1 of the auth-aws plugin.
Users are advised to upgrade to version 0.1.1 or later to remediate this vulnerability.
Workarounds
For users who are unable to upgrade to version 0.1.1 immediately, the most effective workaround is to guarantee that IAM role names are unique across all AWS accounts that could potentially interact with your OpenBao environment. This is the most critical mitigation step.
Primary Mitigation: Audit your AWS organizations to identify and rename any duplicate IAM role names. Enforce a naming convention that includes account-specific identifiers to prevent future collisions.
While removing wildcards from your bound_iam_principal_arn configuration is still recommended as a security best practice, it will not mitigate this vulnerability if duplicate role names exist.
Credits
This vulnerability was discovered and reported by Pavlos Karakalidis
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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