CVE-2017-5689

What it actually does

The flaw permits unauthenticated network or local attackers to bypass authentication mechanisms in Intel AMT, ISM, and SBT firmware, directly obtaining administrative control over the management engine and underlying host.

Why it matters to the business

Organizations running affected servers face immediate risk of complete remote takeover, enabling data theft, ransomware deployment, or persistent access; the high exploit prevalence and CISA KEV listing require urgent remediation to avoid operational disruption and regulatory exposure.

How an attack unfolds

An attacker locates exposed management ports on vulnerable hardware, crafts requests that exploit the authentication bypass to provision or escalate privileges within the manageability engine, then uses the resulting access to control the host operating system or install additional payloads.

How to fix it

Apply the latest vendor firmware updates that resolve the authentication bypass; where updates are unavailable, disable Intel AMT/ISM/SBT entirely via BIOS settings or network segmentation; monitor for and remove any unauthorized provisioning records.

How to confirm the fix worked

Verify firmware versions against vendor security bulletins, confirm AMT is disabled or patched through management console checks, and perform authenticated scans to ensure no bypass vectors remain accessible.

Typical attack path

1. Scan public or internal networks for devices exposing AMT/ISM ports 16992/16993
2. Send specially crafted unauthenticated requests to trigger the bypass and obtain administrative session
3. Provision or reconfigure manageability features to establish persistent remote control
4. Pivot from the management engine to the host OS for further actions such as credential theft or lateral movement

How to detect it

Review network logs and firewall records for unexpected connections to ports 16992 and 16993, inspect system event logs for AMT provisioning or configuration changes without authorization, and search endpoint telemetry for processes interacting with the management engine after the 2017 disclosure date.

• connections to TCP ports 16992 or 16993 from external sources
• HTTP requests containing WS-Management or SOAP payloads without prior authentication
• AMT provisioning events logged without corresponding administrative action

What your security team should do

• Immediately inventory all systems for Intel AMT/ISM/SBT presence and apply firmware patches
• Disable manageability features on any device not requiring them and enforce network controls to block external access to management ports
• Add monitoring for AMT-related traffic and review logs for historical signs of exploitation given the 2022 KEV deadline