IAM Runtime Principals should not have write access to Bedrock Knowledge Base sources

iam
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Description

This control checks whether your customer-managed IAM 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 Creating and Managing IAM Policies documentation for guidance on modifying policies to include necessary security conditions.