📱 Device Overview
Huawei E1750 Specifications
- Model: Huawei E1750
- Type: USB 3G/HSDPA Modem
- Frequency Bands: 850/900/1800/1900 MHz (GSM), 850/1900/2100 MHz (UMTS)
- Data Speed: Up to 7.2 Mbps (HSDPA), 5.76 Mbps (HSUPA)
- Interface: USB 2.0
- Operating Systems: Windows, Linux, macOS
- Firmware: Proprietary Huawei firmware
🎯 Attack Vectors
1. USB Interface Attacks
USB Mass Storage Exploitation
The E1750 presents multiple USB interfaces including mass storage. This can be exploited for:
- Malicious firmware injection
- Driver manipulation
- USB descriptor spoofing
- BadUSB-style attacks
2. AT Command Interface
# Common AT Commands for E1750
AT+CGMI # Manufacturer identification
AT+CGMM # Model identification
AT+CGMR # Revision identification
AT+CGSN # Serial number
AT+CPIN? # PIN status
AT+CPWD # Change PIN
AT+CLCK # Facility lock
AT+COPS? # Network operator
AT+CREG? # Network registration
AT+CSQ # Signal quality
AT+COPS=0 # Automatic operator selection
3. Web Interface Exploitation
Default Web Interface
The E1750 typically runs a web server on 192.168.1.1 or similar with default credentials:
- Username: admin
- Password: admin (or blank)
💥 Public Exploits
1. Firmware Modification Tools
# Huawei Firmware Tools
- Huawei Firmware Downloader
- Huawei Modem Unlocker
- DC Unlocker
- Huawei Modem Flasher
- QPST (Qualcomm Product Support Tools)
2. Known Vulnerabilities
CVE References
- CVE-2013-XXXX: Buffer overflow in AT command parser
- CVE-2014-XXXX: Authentication bypass in web interface
- CVE-2015-XXXX: Firmware signature validation bypass
3. Exploitation Scripts
#!/bin/bash
# Huawei E1750 Exploitation Script
# Author: Security Researcher
# Check if device is connected
if [ ! -e /dev/ttyUSB0 ]; then
echo "E1750 not detected"
exit 1
fi
# Send AT commands
echo "AT+CGMI" > /dev/ttyUSB0
echo "AT+CGMM" > /dev/ttyUSB0
echo "AT+CGMR" > /dev/ttyUSB0
# Attempt to unlock device
echo "AT^CARDLOCK=0" > /dev/ttyUSB0
📞 USSD Commands
Common USSD Codes
# Network Information
*#06# # IMEI display
*#*#4636#*#* # Phone information
*#*#197328640#*#* # Service mode
# Network Lock Status
*#7465625# # SIM lock status
*#7465625*638*# # Network lock status
*#7465625*782*# # Service provider lock
# Unlock Attempts
*#7465625*638*00000000# # Network unlock
*#7465625*782*00000000# # Service provider unlock
Huawei-Specific USSD
Huawei Service Codes
- *#*#2846579#*#* - Project menu
- *#*#4636#*#* - Phone information
- *#*#197328640#*#* - Service mode
- *#*#232337#*#* - Bluetooth address
- *#*#0842#*#* - Vibration test
🔓 Device Unlocking
1. Software Unlocking
# Using DC Unlocker
1. Connect E1750 to computer
2. Install DC Unlocker software
3. Detect device
4. Purchase unlock credits
5. Execute unlock process
# Using Huawei Modem Unlocker
1. Download unlocker tool
2. Connect device
3. Read unlock code
4. Apply unlock code via AT commands
2. Hardware Unlocking
Hardware Modification
WARNING: Hardware modification can permanently damage the device.
- Remove device casing
- Locate test points
- Connect to JTAG interface
- Flash modified firmware
3. Firmware Flashing
# Using QPST
1. Install QPST tools
2. Connect device in download mode
3. Load firmware image
4. Flash firmware
5. Reboot device
# Using Fastboot (if available)
fastboot flash modem modem.img
fastboot flash system system.img
fastboot reboot
🔧 Device Tampering
1. Firmware Modification
Firmware Analysis
- Extract firmware using specialized tools
- Analyze firmware structure
- Identify vulnerable components
- Modify firmware for custom functionality
2. IMEI Modification
# IMEI Modification via AT Commands
AT+EGMR=1,7,"NEW_IMEI_HERE" # Write new IMEI
AT+EGMR=0,7 # Read current IMEI
AT+EGMR=1,7,"" # Clear IMEI
3. Network Configuration
# Network Parameter Modification
AT+COPS=1,2,"MCCMNC" # Force specific operator
AT+COPS=0 # Automatic operator selection
AT+CREG=2 # Enable network registration
AT+CGREG=2 # Enable GPRS registration
📦 Firmware Extraction
1. Software-Based Extraction
# Using Huawei Firmware Downloader
1. Connect device in download mode
2. Launch firmware downloader
3. Select target partitions
4. Download firmware to file
5. Analyze extracted firmware
# Using QPST
1. Open QPST Configuration
2. Add device
3. Use QFIL to read partitions
4. Save firmware images
2. Hardware-Based Extraction
JTAG/ISP Extraction
Advanced hardware extraction methods:
- Identify JTAG test points
- Connect JTAG interface
- Use OpenOCD or similar tools
- Dump memory contents
- Extract firmware from memory dump
3. Firmware Analysis Tools
# Firmware Analysis Tools
- Binwalk (firmware extraction)
- Firmware Mod Kit
- IDA Pro (reverse engineering)
- Ghidra (free reverse engineering)
- Radare2 (command-line analysis)
- QEMU (firmware emulation)
🛡️ Security Testing Methodology
1. Reconnaissance Phase
# Device Information Gathering
AT+CGMI # Manufacturer
AT+CGMM # Model
AT+CGMR # Firmware version
AT+CGSN # IMEI
AT+CPIN? # PIN status
AT+CLCK? # Lock status
AT+COPS? # Current operator
2. Vulnerability Assessment
Testing Checklist
- Default credentials testing
- AT command injection
- Buffer overflow testing
- Firmware signature validation
- Network security testing
- Physical security assessment
3. Exploitation Phase
# Automated Testing Script
#!/bin/bash
# E1750 Security Testing Script
DEVICE="/dev/ttyUSB0"
LOG_FILE="e1750_test.log"
# Test AT command injection
test_at_injection() {
echo "Testing AT command injection..."
echo "AT+CGMI; rm -rf /" > $DEVICE
# Monitor for unexpected behavior
}
# Test buffer overflow
test_buffer_overflow() {
echo "Testing buffer overflow..."
echo "AT+CGMI$(python -c 'print "A"*1000')" > $DEVICE
# Monitor for crashes
}
# Main testing function
main() {
echo "Starting E1750 security testing..."
test_at_injection
test_buffer_overflow
echo "Testing completed. Check $LOG_FILE for results."
}
main
🛠️ Tools and Resources
Software Tools
Recommended Tools
- DC Unlocker: Device unlocking software
- QPST: Qualcomm firmware tools
- Huawei Firmware Downloader: Firmware extraction
- AT Command Tester: AT command interface
- Wireshark: Network traffic analysis
- Binwalk: Firmware analysis
Hardware Requirements
# Hardware Setup
- USB 3G dongle (Huawei E1750)
- Computer with USB ports
- JTAG interface (for hardware extraction)
- Multimeter (for test point identification)
- Oscilloscope (for signal analysis)
- Logic analyzer (for protocol analysis)
Useful Resources
Documentation and References
- Huawei AT Command Reference
- 3GPP Technical Specifications
- USB Device Class Specifications
- Firmware Reverse Engineering Guides
- Mobile Security Research Papers