How does EchelonGraph detect NIST 800-53 AC-17 violations?

EchelonGraph automatically detects NIST 800-53 AC-17 violations using scanner rule NIST-AC-017. The scanner checks cloud infrastructure configurations in real-time and flags non-compliant resources.

What audit questions are asked for NIST 800-53 AC-17?

List all approved remote-access methods. Has each been authorized? What is the patching SLA for VPN gateways? Are device posture and identity checks enforced for remote access? Show evidence of ZTNA adoption or VPN gateway hardening.

🏛️NIST 800-53 AC-17Rule: NIST-AC-017high

Remote Access

Description

Establish and document usage restrictions, configuration requirements, connection requirements, and implementation guidance for each type of remote access allowed.

⚠️ Risk Impact

Remote access expansion since 2020 created vast attack surface. VPN gateways have become primary breach vectors — Pulse Secure, Fortinet, Citrix all suffered mass-exploit campaigns in 2021-2024.

🔍 How EchelonGraph Detects This

NIST-AC-017Automated scanner rule

EchelonGraph's Tier 1 Cloud Scanner automatically checks for this condition across all connected cloud accounts. Violations are flagged as high-severity findings with remediation guidance.

🔧 Remediation

Document approved remote access methods. Replace legacy VPN with Zero Trust Network Access (ZTNA): Cloudflare Access, Google IAP, Tailscale, Twingate, AWS Verified Access. Enforce device posture + identity + context per request.

💀 Real-World Attack Scenario

Fortinet FortiOS CVE-2022-42475 (RCE in SSL-VPN, Dec 2022). A federal contractor's FortiGate was unpatched for 28 days. State-actor attackers exploited the vuln, established persistent VPN session, then pivoted to internal Active Directory. Investigation revealed AC-17 deficiency: 'remote access documentation did not require timely patching of VPN gateways'.

💰 Cost of Non-Compliance

VPN-related breaches: 32% of 2023 enterprise breaches involved compromised remote-access infrastructure (Mandiant M-Trends 2024). Average cost: $5.1M. CISA Emergency Directive 23-02 specifically called out exposed VPN gateways as priority.

📋 Audit Questions

1.List all approved remote-access methods. Has each been authorized?
2.What is the patching SLA for VPN gateways?
3.Are device posture and identity checks enforced for remote access?
4.Show evidence of ZTNA adoption or VPN gateway hardening.

🎯 MITRE ATT&CK Mapping

T1133 — External Remote ServicesT1190 — Exploit Public-Facing Application

⚡ Common Pitfalls

⛔Legacy VPN with no MFA on the VPN gateway itself
⛔VPN-protected internal services that are also accessible directly from the internet
⛔Patching cadence for VPN appliances slower than for application-layer software

📈 Business Value

Modern remote access (ZTNA) eliminates the VPN-gateway-as-perimeter pattern that 2024 adversaries specifically exploit. Reduces breach exposure 60-80% vs traditional VPN.

⏱️ Effort Estimate

Manual

40-80 hours for VPN-to-ZTNA migration per environment

With EchelonGraph

EchelonGraph monitors remote-access entry points for misconfigurations + CVE exposure

🔗 Cross-Framework References

SOC2-CC6.6ISO27001-A.6.7

Automate NIST 800-53 AC-17 compliance

EchelonGraph continuously monitors this control across all your cloud accounts.

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