‘Agent God Mode’ Flaw in Amazon Bedrock Exposes Critical Privilege Escalation Risk

Breaking: Amazon Bedrock Flaw Grants God‑Mode Access

A severe security vulnerability in Amazon Bedrock’s AgentCore—dubbed “Agent God Mode”—has been uncovered by Unit 42 researchers, allowing attackers with limited IAM permissions to escalate privileges and exfiltrate sensitive data.

The flaw stems from overly broad IAM roles assumed by AWS Bedrock agents, effectively granting elevated permissions far beyond what is necessary for normal operation.

How the Attack Works

Unit 42 discovered that the default IAM policy for Bedrock AgentCore allows arbitrary actions on critical services such as S3, DynamoDB, and Lambda. An attacker who compromises a low‑privileged agent can leverage these permissions to read, modify, or delete any resource that the agent’s role can access.

“This is essentially a backdoor into AWS environments,” said a Unit 42 senior researcher. “Once an adversary gains control of the agent, they inherit the agent’s IAM role—which often has full access to the data pipeline.”

Expert Quotes

“We’ve seen similar ‘God mode’ issues in other cloud services, but this one is particularly dangerous because Bedrock agents are designed to interact with multiple data stores,” commented cloud security expert Dr. Elena Torres. “Enterprises need to audit their agent policies immediately.”

Background

Amazon Bedrock is a managed service for building generative AI applications. AgentCore is the component that orchestrates tasks, including calling APIs and accessing data sources. By default, agents are assigned a broad IAM role that allows them to perform a wide range of operations.

Unit 42 detailed the flaw in a recent technical report, warning that the misconfiguration could lead to privilege escalation and data exfiltration if an agent is compromised or misused.

What This Means

Organizations using Amazon Bedrock must immediately review and tighten the IAM policies attached to their agents. The principle of least privilege is critical here—grant only the specific actions and resources each agent truly needs.

“This isn’t just a warning; it’s a call to action,” said Unit 42’s lead researcher. “Every AWS customer with Bedrock agents should treat this as an urgent security event.”

In addition to policy review, AWS recommends enabling CloudTrail logging and implementing guardrails like S3 bucket policies that restrict agent access to only required prefixes.

Immediate Mitigation Steps

• Audit all Bedrock agent IAM roles for over‑privileged permissions.
• Restrict agent roles to specific resource ARNs and actions.
• Enable CloudTrail and set up alerts for anomalous agent activity.
• Review AWS IAM Access Analyzer findings for unused permissions.

For a detailed technical walkthrough, see How the Attack Works above.

Summary

The “Agent God Mode” vulnerability in Amazon Bedrock allows privilege escalation and data exfiltration via overly broad IAM permissions. Urgent action is required to restrict agent roles to the least privilege necessary.