title: AccessKeyID validation bypass
description: A security issue was discovered in aws-iam-authenticator where an allow-listed IAM identity may be able to modify their username and escalate privileges.
problem types: CWE-20 Improper Input Validation
affected:
{
product: aws-iam-authenticator
vendor: Kubernetes
versions:
lessThan: unspecified, status: affected, version: v0.5.2, versionType: custom
lessThan: v0.5.9, status: affected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 8.1
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
version: 3.1
]
workarounds: Prior to upgrading, this vulnerability can be mitigated by not using the {{AccessKeyID}} template value to construct usernames.