AWS Bedrock Sandbox Escape via DNS Tunneling

Researchers discovered a critical vulnerability in Amazon Bedrock AgentCore that allows attackers to escape sandbox isolation using DNS tunneling techniques. This exploit enables unauthorized data exfiltration and command-and-control communication by bypassing network controls designed to contain AI workloads. The vulnerability exposes fundamental weaknesses in cloud-based AI service isolation, demonstrating that even managed services require additional security controls. Organizations relying on cloud AI platforms must implement defense-in-depth strategies rather than trusting vendor isolation alone.

Tactical Insight

Immediate actions

Implement DNS monitoring and filtering to detect suspicious DNS queries and tunneling attempts
Configure egress filtering rules to restrict outbound network traffic from AI workloads
Enable detailed logging for all DNS requests from Bedrock AgentCore instances

Network security measures

Deploy network segmentation to isolate AI workloads from sensitive data and systems
Implement DNS security solutions that can detect and block covert channel communications
Configure firewall rules to limit AI agent network access to only required services

Long-term improvements

Establish regular security assessments of cloud AI service configurations
Develop incident response procedures specifically for AI workload compromises
Implement data loss prevention (DLP) controls around AI processing environments