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Under Active Attack

Executive Summary

In March 2026, AWS updated its Threat Technique Catalog to highlight a significant security concern: the abuse of Amazon Cognito refresh tokens. Threat actors have been exploiting long-lived refresh tokens to maintain unauthorized access to AWS environments. By obtaining a valid refresh token—through methods like credential theft or compromised client-side storage—attackers can continuously generate new access and ID tokens without re-authentication, effectively establishing a persistent foothold in the system. This technique allows them to operate undetected, as the legitimate user's session remains unaffected. The default lifespan of these tokens is 30 days, but they can be configured for up to 10 years, amplifying the potential risk. (aws-samples.github.io)

This incident underscores the evolving tactics of cyber adversaries who leverage legitimate cloud service functionalities to evade detection. Organizations must reassess their security postures, particularly concerning token management and monitoring, to mitigate such stealthy persistence mechanisms.

Why This Matters Now

The exploitation of Amazon Cognito refresh tokens represents a shift in attacker strategies, emphasizing the need for organizations to implement robust token management practices and enhance monitoring to detect unauthorized access attempts promptly.

Attack Path Analysis

MITRE ATT&CK® Techniques

Potential Compliance Exposure

Sector Implications

Sources

Frequently Asked Questions

It refers to the exploitation of long-lived refresh tokens by attackers to maintain unauthorized access to AWS environments without re-authentication.

Cloud Native Security Fabric Mitigations and ControlsCNSF

Aviatrix Zero Trust CNSF is pertinent to this incident as it could have constrained the attacker's ability to escalate privileges, move laterally, and exfiltrate data by enforcing strict segmentation and identity-aware policies.

Initial Compromise

Control: Cloud Native Security Fabric (CNSF)

Mitigation: The attacker's unauthorized access may have been limited by enforcing strict identity-aware policies, reducing the scope of compromised credentials.

Privilege Escalation

Control: Zero Trust Segmentation

Mitigation: The attacker's ability to escalate privileges could have been constrained by enforcing least-privilege access controls, reducing the scope of potential privilege escalation.

Lateral Movement

Control: East-West Traffic Security

Mitigation: The attacker's lateral movement within the environment could have been constrained by monitoring and controlling east-west traffic, reducing the reach of unauthorized actions.

Command & Control

Control: Multicloud Visibility & Control

Mitigation: The attacker's ability to establish and maintain command and control channels could have been constrained by providing comprehensive visibility and control over multicloud environments.

Exfiltration

Control: Egress Security & Policy Enforcement

Mitigation: The attacker's data exfiltration efforts could have been constrained by enforcing strict egress policies, reducing unauthorized data transfers.

Impact (Mitigations)

The attacker's ability to disrupt recovery efforts could have been constrained by limiting unauthorized modifications to critical resources, reducing the impact on system restoration.

Impact at a Glance

Affected Business Functions

  • Identity and Access Management
  • Disaster Recovery
  • Infrastructure Management
Operational Disruption

Estimated downtime: 7 days

Financial Impact

Estimated loss: $50,000

Data Exposure

Potential unauthorized access to sensitive user data and critical infrastructure configurations.

Recommended Actions

  • • Enable refresh token rotation and set minimal token lifetimes to reduce the risk of unauthorized access.
  • • Monitor IAM role trust policy changes and alert on modifications to detect potential privilege escalation.
  • • Implement zero trust segmentation to limit lateral movement within the environment.
  • • Enforce egress security policies to control and monitor outbound traffic, preventing unauthorized data exfiltration.
  • • Establish AMI retention rules and monitor deregistration events to protect critical recovery assets.

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