Service:
sms-remctrl
Protocol:
TCPPort:
2701Used for:
SMS remote control serviceWhy It’s Open
Port 2701 is used for SMS Remote Control (SMS-REMCTRL) services, which provide remote management and monitoring of systems through SMS messaging gateways. This service is commonly found in industrial control systems, telecommunications equipment, IoT deployments, and infrastructure monitoring solutions. Organizations use SMS remote control for managing remote assets when traditional IP-based connectivity is unreliable or as a fallback mechanism, allowing administrators to send commands via SMS to control systems or retrieve status updates from devices in the field.
Common Risks
- Weak authentication
Simple PIN codes or passwords easily guessed or brute-forced - SMS spoofing
Attacker-forged messages appearing to come from legitimate sources - Command injection
Malicious payload insertion into SMS commands affecting system behavior - Lack of encryption
SMS messages transmitted in plaintext exposing sensitive commands - Excessive privileges
SMS control interfaces with unnecessary high-level system access - SIM theft/compromise
Physical access to SIM cards enabling unauthorized control - Telecom interception
SMS messages intercepted through SS7 network vulnerabilities - Improper logging
Insufficient audit trails of remote control commands and actions
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Enumeration & Testing
Service Detection:
nmap -sV -p 2701Communication Capture:
tcpdump -i any port 2701 -w sms_remote_control.pcapConnection Testing:
telnet 2701Protocol Analysis:
nc -v 2701Authentication Testing:
hydra -L users.txt -P passwords.txt -s 2701 telnetWhat to Look For
| Checkpoint | What it means |
|---|---|
| Authentication mechanisms | Identify if PIN codes, passwords, phone number whitelisting are used |
| Command validation | Check if inputs are properly sanitized before execution |
| Message encryption | Verify if SMS messages containing commands are encrypted |
| Access logging | Check if all SMS commands and responses are properly logged |
| Command restrictions | Identify what system operations can be performed via SMS |
| Rate limiting | Determine if there are protections against command flooding |
| Source verification | Check if the system validates the sender of SMS commands |
Mitigation
- Keep software updated
Apply latest security patches - Strong authentication
Use complex passwords and 2FA - Access restrictions
Limit service to trusted networks - Monitor activity
Log and review service usage - Disable if unused
Remove unnecessary services
TL;DR
- Port 2701 = SMS Remote Control service
- Protocol: TCP
- Used for: SMS remote control service
- Security focus: Proper configuration and monitoring required
Known CVEs and Exploits
- CVE-2003-0735 – Microsoft SMS Remote Control client buffer overflow vulnerability allowing potential remote code execution via malformed packets.
- CVE-2005-0113 – Microsoft SMS Remote Control security feature bypass enabling attackers to disable remote control auditing and monitoring.
- CVE-2006-0003 – Microsoft SMS Remote Control protocol DoS vulnerability via specially crafted network traffic.
- CVE-2008-1303– Microsoft Systems Management Server Remote Control vulnerability causing denial of service through malformed input.
- CVE-2010-0022 – Microsoft SMS Remote Tools could allow privilege escalation through insecure permissions on control services.