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Satyam Rastogi
Satyam Rastogi

Posted on Originally published at satyamrastogi.com

mySCADA myPRO Manager: GSM Modem & Admin Hijacking via OT Vulns

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Originally published on satyamrastogi.com

mySCADA myPRO Manager exposes critical privilege escalation and GSM modem injection flaws enabling remote admin hijacking and arbitrary SMS command execution in OT environments. Affects multiple versions.

mySCADA myPRO Manager: GSM Modem & Admin Account Hijacking - OT Exploitation Chain

Executive Summary

mySCADA myPRO Manager contains multiple high-severity vulnerabilities that allow unauthenticated or low-privilege attackers to escalate permissions and manipulate connected GSM modems for unauthorized SMS transmission. From an offensive security perspective, this represents a critical attack surface in industrial control system (ICS) environments where such devices manage critical infrastructure monitoring and response.

The vulnerability chain enables attackers to:

  1. Achieve privileged management function access without proper authentication
  2. Inject arbitrary SMS commands through connected GSM modems
  3. Bypass authorization controls for administrative operations
  4. Maintain persistent access through elevated privileges

For environments running vulnerable versions, exploitation requires minimal initial access - often achievable through network reconnaissance or supply chain compromise. The GSM modem attack vector is particularly dangerous in geographically distributed OT environments relying on SMS-based alerting and remote control.

Attack Vector Analysis

Authentication Bypass & Privilege Escalation

The primary vulnerability exploits improper access control mechanisms within myPRO Manager's administrative interface. From the attacker perspective, this maps to MITRE ATT&CK technique T1078: Valid Accounts when leveraging default credentials, combined with T1548: Abuse Elevation Control Mechanism for privilege escalation.

The vulnerability likely stems from:

  • Inadequate session token validation
  • Missing authentication checks on privileged endpoints
  • Improper role-based access control (RBAC) implementation
  • Default or hardcoded credentials in deployment configurations

Attackers exploiting this typically perform initial reconnaissance to identify exposed myPRO Manager instances on networks or the internet using infrastructure reconnaissance techniques. Once identified, they attempt direct access to administrative panels using default credentials or bypass techniques.

GSM Modem Injection & SMS Abuse

The second attack vector abuses the GSM modem integration - a common component in OT environments for alarm notification and remote command execution via SMS. This aligns with MITRE ATT&CK T1570: Lateral Tool Transfer and T1570: Remote Service Session Hijacking, where attackers redirect communication channels.

In vulnerable configurations, the application fails to properly validate or sanitize SMS payloads before transmission. Attackers can craft SMS messages containing:

  • Control commands for connected industrial devices
  • Configuration modification directives
  • Authentication bypass sequences
  • Reconnaissance probes to map device topology

Similar to vulnerabilities affecting VMAX DVR/NVR systems used as network pivot points, myPRO Manager's connectivity to communications infrastructure creates a secondary attack path - using the application itself as a command relay rather than targeting end devices directly.

Technical Deep Dive

Exploitation Mechanics

While CISA's advisory does not disclose specific CVE details pending patches, typical exploitation follows this pattern:

Phase 1: Instance Discovery

GET /myPRO/admin HTTP/1.1
Host: [target]:8080
User-Agent: Mozilla/5.0

Response reveals application version and authentication mechanism
Status: 200 OK
<!DOCTYPE html>
<title>mySCADA myPRO Manager v[VERSION]</title>
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Attackers use shodan.io or similar reconnaissance to identify exposed instances with search filters like:

"mySCADA" "myPRO Manager" http.title
port:8080,8443 product:"mySCADA"
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Phase 2: Authentication Bypass Attempt

POST /login HTTP/1.1
Content-Type: application/x-www-form-urlencoded

username=admin&password=admin
username=admin&password=12345
username=&password=
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Common default credentials across SCADA vendors frequently grant initial access. Once authenticated (or bypassed), attackers access the administrative dashboard.

Phase 3: GSM Modem Command Injection

POST /api/sms/send HTTP/1.1
Content-Type: application/json
Cookie: session_token=[VALID_OR_FORGED]

{
 "recipient": "+[TARGET_PHONE]",
 "message": "*5555*1234#",
 "modem_id": 1,
 "priority": "high"
}
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The vulnerability manifests when the application:

  1. Fails to validate modem_id ownership
  2. Doesn't authenticate SMS transmission requests
  3. Allows arbitrary payload formatting without sanitization
  4. Doesn't log or restrict SMS volume

This enables attackers to send USSD codes, SMS-based commands to industrial devices, or reconnaissance probes through legitimate infrastructure.

OT-Specific Attack Implications

Unlike traditional IT environments, GSM modem injection in SCADA/OT systems has amplified impact:

  • SMS-based device commands: Many industrial devices use SMS as a command interface for remote reset, configuration, or shutdown
  • Alert spoofing: Attackers can inject fake alarms, causing unnecessary response or masking legitimate incidents
  • Supply chain vulnerability: Integrators deploying myPRO Manager across multiple client sites create enterprise-scale exploitation opportunities

This vulnerability pattern mirrors the supply chain compromise approach demonstrated by the Admin Menu Editor Pro backdoor, where software distribution itself becomes the attack vector.

Detection Strategies

Network-Level Detection

  1. Monitor myPRO Manager API endpoints for unauthorized access

    • Flag POST requests to /api/sms/send from unexpected source IPs
    • Alert on rapid-succession SMS transmission requests (>5 per minute)
    • Correlate SMS transmission with lack of prior user login events

  2. GSM modem traffic anomalies

    • Baseline normal SMS volume and recipient patterns
    • Alert on USSD codes or SMS payloads matching device command formats
    • Monitor for SMS transmission to phone numbers not in authorized recipient lists

  3. Administrative interface reconnaissance

    • Detect repeated failed authentication attempts to /admin or /login
    • Flag successful logins from geographic locations inconsistent with operational patterns
    • Alert on administrative actions (configuration changes, user creation) outside change windows

Host-Level Detection 

# Monitor myPRO Manager logs for suspicious patterns

FILE: /var/log/myscada/access.log

# Signature 1: Unauthenticated admin access
"GET /api/admin" "401 Unauthorized" -> "200 OK"

# Signature 2: Rapid SMS transmission without auth event
GREP: timestamp, src_ip, endpoint=/api/sms/send, count > 5/minute

# Signature 3: GSM modem command execution
REGEX: /api/sms.*message.*\*[0-9]{4}\*[0-9]+#
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Endpoint Detection and Response (EDR)

  • Monitor myPRO Manager process for unusual child processes (shell spawning, script execution)
  • Track file modifications in application configuration directories
  • Alert on network connections to phone numbers or external SMS gateways not configured by administrators

Mitigation & Hardening

Immediate Actions (Pre-Patch)

  1. Network Segmentation

    • Isolate myPRO Manager instances from public internet access
    • Restrict management access to jump hosts or VPN-only connectivity
    • Implement MAC-based access controls for GSM modem interfaces

  2. Credential Hardening

    • Change all default credentials immediately
    • Implement account lockout policies (5 failed attempts = 30-minute lockout)
    • Deploy multi-factor authentication if supported by version

  3. GSM Modem Restrictions

    • Whitelist authorized recipient phone numbers at the application level
    • Disable SMS transmission outside maintenance windows
    • Implement SMS command payload validation/sanitization
    • Consider disabling GSM modem functionality temporarily if not operationally critical

Long-Term Hardening

  1. Patch Management

    • Subscribe to CISA advisories for mySCADA products
    • Implement patching schedule within 30 days of vendor release (SLA-dependent on OT environment)
    • Test patches in isolated lab environments before production deployment

  2. Application Hardening

    • Enable all available security features (HTTPS-only, secure session tokens, HTTP security headers)
    • Implement request rate limiting on authentication and SMS endpoints
    • Deploy Web Application Firewall (WAF) rules blocking known exploitation patterns

  3. Authentication Modernization

    • Migrate from basic auth to OAuth 2.0 or SAML 2.0 where supported
    • Implement certificate-based authentication for modem operations
    • Use hardware security keys for administrative access (similar to passkey deployments discussed in Microsoft Cloud Account Hijacking prevention)

  4. Monitoring & Alerting

    • Implement Security Information and Event Management (SIEM) correlation for authentication + SMS events
    • Deploy tamper detection on application configuration files
    • Enable audit logging for all administrative operations with immutable storage

Related Vulnerabilities in OT Ecosystems

This vulnerability class reflects broader OT attack surface trends. Similar patterns appear in:

Key Takeaways

  • GSM modems represent critical secondary attack vectors in OT environments - compromising SCADA manager software bypasses device hardening
  • Default credentials remain the fastest path to OT compromise - inventory and remediate across all deployed instances immediately
  • SMS injection attacks have real operational impact in industrial environments where SMS-based alerting and commands are control mechanisms
  • Patch OT software under compressed timelines compared to IT - unlike enterprise applications, OT exploits translate directly to physical impact
  • Supply chain visibility is essential - identify all myPRO Manager instances across your organization including integrator-managed systems

References

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