Bedrock Knowledge Base write access should be condition-scoped in IAM role inline policies

iam
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Description

This control checks whether your IAM role inline policies for write access to Bedrock Knowledge Base (KB) sources include appropriate security conditions to restrict access. Without these conditions, principals could inadvertently gain excessive permissions, leading to KB poisoning risks.

The control fails if the policy allows any write actions without a condition providing additional security context:

  • Actions containing:
    • bedrock:createknowledgebase
    • bedrock:updateknowledgebase
    • bedrock:deleteknowledgebase
    • bedrock:ingestknowledgebasedocuments
    • bedrock:associateagentknowledgebase
    • bedrock:disassociateagentknowledgebase
    • bedrock:deleteknowledgebasedocuments
    • bedrock:createagent
    • bedrock:updateagent
    • bedrock:deleteagent
    • bedrock:createprompt
    • bedrock:updateprompt
    • bedrock:deleteprompt
    • bedrock:createdatasource
    • bedrock:updatedatasource
    • bedrock:deletedatasource
    • bedrock:createflow
    • bedrock:updateflow
    • bedrock:deleteflow
    • bedrock:create*
    • bedrock:update*
    • bedrock:delete*
    • bedrock:modify*
    • bedrock:*
    • *

The control specifically verifies the presence of security conditions, such as aws:PrincipalArn, aws:SourceIp, aws:ResourceTag, or aws:MultiFactorAuthPresent, ensuring that access is appropriately restricted.

Remediation

See the IAM JSON Policy Elements: Condition and Managing IAM Role Inline Policies documentation for guidance on modifying inline policies to include necessary security conditions.