Comprehensive Technical Analysis of CVE-2023-2746

CVE ID: CVE-2023-2746 CVSS Score: 9.6 (Critical) Vulnerability Type: Cross-Site Request Forgery (CSRF) with Insecure CORS Configuration Affected Software: Rockwell Automation Enhanced Human-Machine Interface (HIM) Software

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1. Vulnerability Assessment and Severity Evaluation

Vulnerability Overview

CVE-2023-2746 describes a Cross-Site Request Forgery (CSRF) vulnerability in Rockwell Automation’s Enhanced HIM software, exacerbated by improper Cross-Origin Resource Sharing (CORS) settings. The flaw allows an attacker to execute unauthorized actions on behalf of an authenticated user by tricking them into clicking a malicious link or falling victim to a Cross-Site Scripting (XSS) attack.

CVSS Breakdown (v3.1)

Metric	Score	Description
Attack Vector (AV)	Network (N)	Exploitable remotely via web requests.
Attack Complexity (AC)	Low (L)	No specialized conditions required.
Privileges Required (PR)	None (N)	No prior authentication needed.
User Interaction (UI)	Required (R)	Victim must click a malicious link.
Scope (S)	Changed (C)	Impacts confidentiality, integrity, and availability.
Confidentiality (C)	High (H)	Sensitive data exposure possible.
Integrity (I)	High (H)	Unauthorized actions can be performed.
Availability (A)	High (H)	Potential for full system compromise.

Severity Justification:

• Critical (9.6) due to:
  • Remote exploitation (no physical access required).
  • No authentication needed (only user interaction).
  • High impact on confidentiality, integrity, and availability.
  • Chained exploitation (CSRF + XSS) increases attack surface.

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2. Potential Attack Vectors and Exploitation Methods

Primary Exploitation Paths

A. Direct CSRF Exploitation

1. Attacker Crafts a Malicious Request

   • The attacker identifies an unprotected API endpoint in the Enhanced HIM software.
   • Constructs a forged HTTP request (e.g., GET/POST) that performs an unauthorized action (e.g., modifying configurations, extracting data).
   • Embeds the request in a malicious link (e.g., <img src="http://vulnerable-him/api/action?param=malicious">).

2. Social Engineering to Trigger the Request

   • The attacker tricks a logged-in user (e.g., via phishing email, compromised website) into clicking the link.
   • The victim’s browser automatically sends the request with their session cookies, bypassing authentication checks.

3. Unauthorized Action Execution

   • The HIM software processes the request without CSRF tokens or proper CORS validation, executing the attacker’s command.

B. Chained Exploitation (CSRF + XSS)

1. XSS as a Delivery Mechanism

   • If the HIM software has an XSS vulnerability, the attacker injects malicious JavaScript into a trusted page.
   • The script automatically sends CSRF requests without user interaction.

2. Session Hijacking & Full Compromise

   • The attacker exfiltrates session tokens or performs privilege escalation via CSRF.
   • Potential for remote code execution (RCE) if the HIM software interacts with underlying industrial control systems (ICS).

Exploitation Requirements

Requirement	Details
User Interaction	Victim must click a link or visit a malicious page.
Authentication	Victim must be logged into the HIM software.
Network Access	Attacker must be able to send HTTP requests to the HIM system.
CORS Misconfiguration	The API must allow requests from arbitrary origins (Access-Control-Allow-Origin: *).

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3. Affected Systems and Software Versions

Vulnerable Products

• Rockwell Automation Enhanced HIM Software (specific versions not publicly disclosed in CVE details).
• Likely impacts FactoryTalk View SE, FactoryTalk View ME, or other HMI solutions integrating Enhanced HIM.

Recommended Verification Steps

1. Check Software Version
   • Review Rockwell Automation’s security advisory for affected versions.
2. API Endpoint Testing
   • Use Burp Suite or OWASP ZAP to test for:
     • Missing CSRF tokens in state-changing requests (POST, PUT, DELETE).
     • Overly permissive CORS headers (Access-Control-Allow-Origin: *).
3. Network Segmentation Review
   • Ensure the HIM software is not exposed to the internet (should be in a DMZ or isolated OT network).

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4. Recommended Mitigation Strategies

Immediate Remediation Actions

Mitigation	Implementation Details
Apply Vendor Patches	Install the latest updates from Rockwell Automation’s security advisory.
Enforce CSRF Protection	- Implement CSRF tokens for all state-changing requests. - Use SameSite cookie attributes (SameSite=Lax or Strict).
Restrict CORS Policies	- Replace Access-Control-Allow-Origin: * with explicit allowed domains. - Disable credentialed CORS requests if unnecessary.
Disable Unused APIs	- Audit and disable unused API endpoints. - Implement rate limiting to prevent brute-force attacks.
Network-Level Protections	- Segment HIM systems from corporate networks. - Use firewalls to restrict access to trusted IPs. - Deploy Web Application Firewalls (WAFs) to block CSRF/XSS attempts.

Long-Term Security Enhancements

1. Secure Development Practices
   • Input validation to prevent XSS.
   • Output encoding to mitigate injection attacks.
   • Security headers (Content-Security-Policy, X-Frame-Options).
2. User Awareness Training
   • Educate operators on phishing risks and suspicious link avoidance.
3. Continuous Monitoring
   • Deploy SIEM solutions (e.g., Splunk, IBM QRadar) to detect anomalous API requests.
   • Enable logging for all API interactions for forensic analysis.

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5. Impact on the Cybersecurity Landscape

Industry-Specific Risks

• Critical Infrastructure (ICS/OT)
  • HIM software is often used in manufacturing, energy, and water treatment sectors.
  • A successful CSRF attack could lead to operational disruption, safety incidents, or data breaches.
• Supply Chain Attacks
  • If the HIM software integrates with third-party systems, the vulnerability could be a lateral movement vector.

Broader Implications

• Increased Attack Surface for OT Networks
  • Historically, OT systems relied on air-gapping, but modern HMI solutions are web-enabled, increasing exposure.
• Regulatory Compliance Risks
  • Non-compliance with NIST SP 800-82, IEC 62443, or NERC CIP could result in fines or legal action.
• Reputation Damage
  • A successful exploit could erode trust in Rockwell Automation’s security posture, affecting customer retention.

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6. Technical Details for Security Professionals

Proof-of-Concept (PoC) Exploitation

Step 1: Identify Vulnerable Endpoints

• Use Burp Suite or Postman to intercept requests to the HIM API.
• Look for:

  GET /api/config?action=modify&value=malicious HTTP/1.1
  Host: vulnerable-him
  Origin: http://attacker.com
  

  • If the response includes:

    Access-Control-Allow-Origin: *
    Access-Control-Allow-Credentials: true
    

    → CORS misconfiguration confirmed.

Step 2: Craft a CSRF Exploit

• Example Malicious HTML (Stored in Attacker-Controlled Server):

  <html>
    <body>
      <form action="http://vulnerable-him/api/config" method="POST">
        <input type="hidden" name="action" value="modify" />
        <input type="hidden" name="value" value="malicious_payload" />
      </form>
      <script>
        document.forms[0].submit(); // Auto-submit on page load
      </script>
    </body>
  </html>
  

• Alternative (XSS-Based CSRF):

  fetch("http://vulnerable-him/api/config", {
    method: "POST",
    credentials: "include", // Sends cookies
    body: JSON.stringify({ action: "modify", value: "malicious" })
  });
  

Step 3: Deliver the Exploit

• Phishing Email:
  • "Click here to update your HIM dashboard: http://attacker.com/csrf-exploit.html"
• Compromised Website:
  • Inject the malicious script into a legitimate but vulnerable site (e.g., via XSS).

Detection & Forensics

Indicator	Detection Method
Unusual API Requests	SIEM alerts for unexpected POST/PUT requests to HIM endpoints.
CORS Policy Violations	WAF logs showing Origin header mismatches.
Session Anomalies	Multiple simultaneous requests from the same session.
Unauthorized Configuration Changes	HIM audit logs showing unexpected modifications.

Hardening Recommendations

1. API Security
   • Implement OAuth 2.0 / OpenID Connect for authentication.
   • Use JWT with short expiration times.
2. Network Security
   • Micro-segmentation to isolate HIM systems.
   • Zero Trust Architecture (ZTA) for OT environments.
3. Runtime Application Self-Protection (RASP)
   • Deploy RASP solutions to detect and block CSRF/XSS at runtime.

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Conclusion

CVE-2023-2746 represents a critical risk to industrial environments using Rockwell Automation’s Enhanced HIM software. The combination of CSRF and CORS misconfigurations enables remote exploitation with high impact, potentially leading to data breaches, operational disruption, or full system compromise.

Immediate action is required: ✅ Patch affected systems via Rockwell Automation’s advisory. ✅ Enforce CSRF protections and restrict CORS policies. ✅ Segment HIM networks and monitor for anomalous activity.

Security teams should prioritize this vulnerability in OT/ICS environments due to its high severity and potential for cascading effects on critical infrastructure.

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References:

• Rockwell Automation Security Advisory
• OWASP CSRF Prevention Cheat Sheet
• NIST SP 800-82 Guide to ICS Security