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Muvi K-Series Fun

I recently picked up a Muvi K-Series camera. Supposedly it works with Android ... but not really with 5.0.1. So I decided to start poking

Initially, I tried to connect with my phone, was unable to connect to the device, but I was able to connect to the wifi and get an IP address. So I fired up my laptop and trusty wireshark to see what was going on and it was ... nothing. Crud. Ok, let's go back to layer 1, 2 and 3 to see what I'm starting with:

[wyatt@yogasploit:~]$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface         UG    0      0        0 wlan0   U     9      0        0 wlan0

Ok, so let's see what's at

[wyatt@yogasploit:~]$ nmap -sT

Starting Nmap 6.40 ( ) at 2015-03-18 20:27 EDT
Nmap scan report for
Host is up (0.065s latency).
Not shown: 997 closed ports
53/tcp  open  domain
80/tcp  open  http
554/tcp open  rtsp

That's interesting enough. Android loves some http action, let's see what we have there at /:

Name 	Size
[DIR] 	DCIM 	-
[DIR] 	html 	-
[DIR] 	live 	-
[DIR] 	mjpeg 	-
[DIR] 	pref 	-
[DIR] 	shutter 	-

Oh now that is super cool. Just for grins, let's take a picture and then see what shows up in /shutter (which is currently empty):

Name 	Size
[ ] 	100-0003.jpg 	70K

Boom, that's cool and sure enough the image is exactly what I just captured as an image. I'm assuming /mpeg will do the same basic things but just keep storage of the video files so let's see whats in /live/

Name 	Size
[ ] 	precap-1.ts 	link
[ ] 	precap-2.ts 	link
[ ] 	precap-3.ts 	link
[ ] 	precap-4.ts 	link
[ ] 	precap-5.ts 	link
[ ] 	precap-6.ts 	link
[ ] 	precap-7.ts 	link
[ ] 	precap-8.ts 	link

Quickly firing these up in VLC didn't really work all the well so I went back to the /mpegj directory and was met with a constantly stream GET requests for items that just return a 404, sometimes there are a few repeats, but not in this capture:

Well, no love there so let's take a look at /html and w00t! there's a rstp.html file and when we click it we get ... a blank page. LAME! WTF is up with that? Let's see if there's a hint in the source:

  $(function loadRTSP() {
    var player = document.getElementById("playerId");
    var playlist = player.playlist;
    //var id = playlist.add("rtsp://", "", new Array());
    }, 100);

Well, no wonder it doesn't work and no wonder me clicking on the .ts streams ... I wasn't going to the right URL! So, I could fix the HTML ... but why fix it when we have VLC? Now we just take the rstp:// and toss it into VLC's open. Current review of the stream shows that it's ~2 sec behind actual live information; that sounds about right.

config file

Well, now that we can stream, let's see what else we can do because JQuery was also listed. Wonder what's in that config file under /prefs? It's mostly text:

#video_resolution=1920x1080P 050f 16:09
options=1920x1080P 050f 16:09;1920x1080P 048f 16:09;1920x1080P 025f 16:09;1920x1080P 024f 16:09;1280x0960P 050f 04:03;1280x0960P 048f 04:03;1280x0720P 100f 16:09;1280x0720P 050f 16:09

but there's some odd stuff, like the following:

00000410  30 33 00 00 00 0a 6f 70  74 69 6f 6e 73 3d 70 68  |03....options=ph|
00000420  6f 74 6f 5f 73 68 6f 74  5f 30 33 00 00 00 3b 70  |oto_shot_03...;p|
00000430  68 6f 74 6f 5f 73 68 6f  74 5f 30 36 00 00 00 3b  |hoto_shot_06...;|
00000440  70 68 6f 74 6f 5f 73 68  6f 74 5f 30 38 00 00 00  |photo_shot_08...|
00000450  0a 70 65 72 6d 69 73 73  69 6f 6e 3d 73 65 74 74  |.permission=sett|
000008c0  6c 79 0a 23 6d 61 6e 66  61 63 74 75 72 65 72 3d  |ly.#manfacturer=|
000008d0  00 00 00 00 0a 23 6d 6f  64 75 6c 65 3d 4b 2d 53  |.....#module=K-S|

So ... looking at the format, it might just be as simple as the following:

#video_resolution=1920x1080P 050f 16:09                 <-- current setting? probably.
options=1920x1080P 050f 16:09;1920x1080P 048f 16:09;... <-- possible settings?
permission=settable                                     <-- if we're allowed to set it?

Based on a quick review with the camera, the *_tab items are the same number of items on the camera, so I guess these are the names of them:

video_tab <-- Main video information, framerate, etc.
photo_tab <-- When you take pictures
setup_tab <-- ... wat?
flow_tab  <-- No idea, there's only 3 tabs on my camera?

Either way, we're eventually going to want to read and write that ... I wonder what it is they're sending over to the camera? Sadly, my attempts to get WireShark up and running in a useful fashion have failed for a multitude of reasons, so let's just dig into their code (thank Android Decompiler!). Some hunting around reveals the following:

// createPlainSocket(String host, int port, int timeout)
mControlSock = PlainSocket.createPlainSocket(mRemoteAddr, 7878, 6000);

Ok, so not listening on HTTP anymore, we've got a raw socket to 7878 maybe. What's the command parameter format appear to be UTF-8 JSON:

    protected void initStreams()
        throws IOException
        if (mControlSock != null)
            if (mReader == null)
                mReader = new InputStreamReader(mControlSock.getInputStream(), "UTF-8");
            if (mWriter == null)
                mWriter = new OutputStreamWriter(mControlSock.getOutputStream(), "UTF-8");

    public boolean isCmdSuc(String s)
        throws IOException
        Log.e("SocketClient", (new StringBuilder()).append("isCmdSuc : ").append(s).toString());
        while (s == null || s.compareTo("ready") != 0 && s.compareTo("fail") == 0)
            return false;
        return true;

    private JSONObject createAEECMD(int i, int j, int k, String s, String s1)
        if (s == null && k == -1)
            k = 0;
        if (k == -1)
            k = s.length();
        JSONObject jsonobject = new JSONObject();
            jsonobject.put("msg_id", i);
            jsonobject.put("token", j);
        catch (JSONException jsonexception)
            return jsonobject;
        if (s1 == null)
            break MISSING_BLOCK_LABEL_65;
        jsonobject.put("type", s1);
        if (s == null)
            break MISSING_BLOCK_LABEL_80;
        jsonobject.put("param", s);
        jsonobject.put("param_size", k);
        return jsonobject;

Let's put that to the test:

[wyatt@yogasploit:~]$ nc 7878

{"rval": -7, "param_size": 0 }
{"rval": -7, "param_size": 0 }
{"rval": -7, "param_size": 0 }

Oh that's awesome, I can just read and write JSON? Wait ... port 7878 sounds really familiar, like I've heard about somewhere. So google just the port? Nothing useful. Google the AEE Magic Cam with the port? Nothing useful. Google "GoPro" with the port: yep, I've heard it at DEFCON before.

At this point, I think I'm done. Based on what I can see, the Muvi is a rip-off of the AEE action camera, which is pretty much a rip-off of the GoPro. I've added the de-compiled source code for anyone else that would like to carry on from where I've stopped digging since VEHO's support line hasn't been supportive or helpful.


Research into connecting to the VEHO Muvi K-Series action camera






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