Failed to open display

[dwalters0]

I've had this issue on two completely separate kali instances. I install the tool following the installation instructions. The docker installation completes successfully and sudo ./bkscan.sh -h gives me the expected output. However when I try to scan a target machine with sudo ./bkscan.sh -t <IP Address> I get the following error.

[+] No credential provided, won't support NLA
No protocol specified
[22:41:07:683] [1:1] [ERROR][com.freerdp.client.x11] - failed to open display: :0.0
[22:41:07:683] [1:1] [ERROR][com.freerdp.client.x11] - Please check that the $DISPLAY environment variable is properly set.

[saidelike]

Hi,

It is a known issue with docker and some distributions like Kali. It was discussed in #1 and it is documented in the readme: https://github.com/nccgroup/BKScan#failed-to-open-display

[dwalters0]

After having no luck with kali, I tried on ubuntu 18.04. From a completely fresh install (I chose not to update or upgrade when prompted from the gui), these are the commands I ran

sudo apt-get update
sudo apt-get install docker.io
cd ~/Downloads
git clone https://github.com/nccgroup/BKScan.git
cd BKScan
sudo docker build -t bkscan .
sudo ./bkscan.sh -t xxx.xxx.xxx.xxx -p 3389

and the output I got was

[+] Targeting xxx.xxx.xxx.xxx:3389...
[+] No credential provided, won't support NLA
No protocol specified
[05:38:52:387] [1:1] [ERROR][com.freerdp.client.x11] - failed to open display: :0
[05:38:52:387] [1:1] [ERROR][com.freerdp.client.x11] - Please check that the $DISPLAY environment variable is properly set.

[saidelike]

Sorry to hear you are still having problems. Below are 2 environments I tried a while back but things may have changed since then:

Failing on Ubuntu 18.04:

user@ubuntu18-04:~/rdp_bug/docker/docker-xfreerdp$ echo $DISPLAY 
:0

user@ubuntu18-04:~$ ps aux|grep Xorg 
user       1666  0.4  1.6 533252 131016 tty1    Sl+  Jun03  13:19 /usr/lib/xorg/Xorg vt1 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3

Success on Ubuntu 16.04:

user@ubuntu16-04:~$ ps aux|grep Xorg
root      3868  0.1  0.9 454868 104224 tty7    Ss+  Jun04   3:13 /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitc

Also see http://fabiorehm.com/blog/2014/09/11/running-gui-apps-with-docker/

You may want to try on the latest Ubuntu though as they may have fixed the problem https://ubuntu.com/download/desktop