SEC Consult Vulnerability Lab Security Advisory < 20170316-0 >
=======================================================================
              title: Authenticated Command Injection
            product: Multiple Ubiquiti Networks products, e.g.
                     TS-16-CARRIER, TS-5-POE, TS-8-PRO, AG-HP-2G16,
                     AG-HP-2G20, AG-HP-5G23, AG-HP-5G27, AirGrid M,
                     AirGrid M2, AirGrid M5, AR, AR-HP, BM2HP, BM2-Ti,
                     BM5HP, BM5-Ti, LiteStation M5, locoM2, locoM5,
                     locoM9, M2, M3, M365, M5, M900, NB-2G18, NB-5G22,
                     NB-5G25, NBM3, NBM365, NBM9, NSM2, NSM3, NSM365,
                     NSM5, PBM10, PBM3, PBM365, PBM5, PICOM2HP,
                     Power AP N
 vulnerable version: v1.3.3 (SW), v5.6.9/v6.0 (XM)
      fixed version: -
         CVE number: -
             impact: Critical
           homepage: https://www.ubnt.com
              found: 2016-11-22
                 by: T. Weber (Office Vienna)
                     SEC Consult Vulnerability Lab

                     An integrated part of SEC Consult
                     Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow
                     Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich

                     https://www.sec-consult.com

=======================================================================

Vendor description:
-------------------
"Ubiquiti Networks develops high-performance networking
technology for service providers and enterprises. Our technology
platforms focus on delivering highly advanced and easily deployable
solutions that appeal to a global customer base in underserved and
underpenetrated markets."

Source: http://ir.ubnt.com/


Business recommendation:
------------------------
SEC Consult recommends not to use this product in a production environment
until a thorough security review has been performed by security
professionals and all identified issues have been resolved.


Vulnerability overview/description:
-----------------------------------
1) Command Injection in Admin Interface
A command injection vulnerability was found in "pingtest_action.cgi".
This script is vulnerable since it is possible to inject a value of a
variable. One of the reasons for this behaviour is the used PHP version
(PHP/FI 2.0.1 from 1997).

The vulnerability can be exploited by luring an attacked user to click
on a crafted link or just surf on a malicious website. The whole attack
can be performed via a single GET-request and is very simple since there
is no CSRF protection. See our other advisory published in January 2017:
https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20170130-0_Ubiquiti_Networks_XSS_CSRF_v10.txt

An attacker can open a port binding or reverse shell to connect to the
device and is also able to change the "passwd" since the web service
runs with root privileges!

Furthermore, low privileged read-only users, which can be created in the web
interface, are also able to perform this attack.

If the Ubiquiti device acts as router or even as firewall, the attacker
can take over the whole network by exploiting this vulnerability.


Proof of concept:
-----------------
1) Command Injection in Admin Interface
The following link can be used to open a reverse shell to the attacker's
IP address. There are two possibilities for the different firmware
versions.
Reverse root shell - firmware: v1.3.3 (SW)
[ PoC removed - no patch available ]

Reverse root shell - firmware: v5.6.9/v6.0 (XM)
[ PoC removed - no patch available ]

A video is available here: https://youtu.be/oU8GNeP_Aps


Vulnerable / tested versions:
-----------------------------
The following devices and firmware versions have been tested/verified:
TS-8-PRO                     - v1.3.3 (SW)
(Rocket) M5                  - v5.6.9/v6.0 (XM)
(PicoStationM2HP) PICOM2HP   - v5.6.9/v6.0 (XM)
(NanoStationM5) NSM5         - v5.6.9/v6.0 (XM)

Based on information embedded in the firmware of other Ubiquiti products
gathered from our IoT Inspector tool we believe the following devices are
affected as well:

Ubiquiti Networks AF24 (Version: AF24 v3.2)
Ubiquiti Networks AF24HD (Version: AF24 v3.2)
Ubiquiti Networks AF-2X (Version: AF2X v3.2 )
Ubiquiti Networks AF-3X (Version: AF3X v3.2)
Ubiquiti Networks AF5 (Version: AF5 v3.2)
Ubiquiti Networks AF5U (Version: AF5 v3.2)
Ubiquiti Networks AF-5X (Version: AF5X v3.2.1)
Ubiquiti Networks AG-PRO-INS (Version: AirGWP v1.1.7)
Ubiquiti Networks airGateway (Version: AirGW v1.1.7)
Ubiquiti Networks airGateway-LR (Version: AirGW v1.1.7)
Ubiquiti Networks AMG-PRO (Version: AirGWP v1.1.7)
Ubiquiti Networks LBE-5AC-16-120 (Version: WA v7.2.4)
Ubiquiti Networks LBE-5AC-23 (Version: WA v7.2.4)
Ubiquiti Networks LBE-M5-23 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks NBE-5AC-16 (Version: WA v7.2.4)
Ubiquiti Networks NBE-5AC-19 (Version: XC v7.2.4)
Ubiquiti Networks NBE-M2-13 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks NBE-M5-16 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks NBE-M5-19 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks PBE-5AC-300 (Version: XC v7.2.4)
Ubiquiti Networks PBE-5AC-300-ISO (Version: XC v7.2.4)
Ubiquiti Networks PBE-5AC-400 (Version: XC v7.2.4)
Ubiquiti Networks PBE-5AC-400-ISO (Version: XC v7.2.4)
Ubiquiti Networks PBE-5AC-500 (Version: XC v7.2.4)
Ubiquiti Networks PBE-5AC-500-ISO (Version: XC v7.2.4)
Ubiquiti Networks PBE-5AC-620 (Version: XC v7.2.4)
Ubiquiti Networks PBE-M2-400 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks PBE-M5-300 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks PBE-M5-300-ISO (Version: XW v5.6.9/v6.0)
Ubiquiti Networks PBE-M5-400 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks PBE-M5-400-ISO (Version: XW v5.6.9/v6.0)
Ubiquiti Networks PBE-M5-620 (Version: XW v5.6.9/v6.0)
Ubiquiti Networks R5AC-Lite (Version: XC v7.2.4)
Ubiquiti Networks R5AC-PRISM (Version: XC v7.2.4)
Ubiquiti Networks R5AC-PTMP (Version: XC v7.2.4)
Ubiquiti Networks R5AC-PTP (Version: XC v7.2.4)
Ubiquiti Networks RM2-Ti (Version: XW v5.6.9/v6.0)
Ubiquiti Networks RM5-Ti (Version: XW v5.6.9/v6.0)


Vendor contact timeline:
------------------------
2016-11-22: Contacting vendor via HackerOne
2016-11-22: Vendor marks it as duplicate to: #143447
2016-11-23: Asking the vendor for a patch.
2016-11-25: Vendor responds that #143447 should be fixed for next stable
            release.
2016-11-25: Asking for an estimated time frame for a fix of the
            vulnerability.
2016-11-25: Vendor can not give a precise date.
2017-01-10: Asking the vendor for a patch and defined release of the
            advisory for 2017-01-16 (concerning the SEC Consult
            disclosure policy). Shifted the deadline to 2017-01-30
            due to Christmas holidays; No answer.
2017-01-17: Asked for an update.
2017-01-17: Vendor excuses for the delay and responds that they got a
            similar report but our PoC does not work.
2017-01-18: Explained PoC again
2017-01-19: Vendor responds that they received a similar report and
            assumed a duplication. They state that our PoC never worked
            and did not make any sense.
2017-01-20: Uploaded a video which shows a live command injection at an
            up-to-date (v6.0) device and posted an assumed reason why
            it's possible to exploit
2017-01-21: Vendor responds that they were able to reproduce it now. They
            also posted the real cause.
2017-01-24: Asking whether the vulnerability is a duplicate to #143447.
2017-01-24: Vendor responds that it is no duplicate and that this
            issue will be fixed as soon as possible.
2017-02-03: Asking for a status update; No answer.
2017-02-21: Asking for a status update; No answer.
2017-03-01: Informing the vendor that the release of the advisory is set to
            2017-03-16; No answer.
2017-03-16: Public advisory release


Solution:
---------
There is no fix available from the vendor.


Workaround:
-----------
Restrict user and network access.


Advisory URL:
-------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SEC Consult Vulnerability Lab

SEC Consult
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Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich

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recommendation about the risk profile of new technologies.

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EOF T. Weber / @2017