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BUILDING AN OPENVAS VULNERABILITY SCANNER ON THE RASPBERRY PI




OPENVAS VULNERABILITY SCANNING WITH THE RASPBERRY PI

The Raspberry Pi is an extremely low-cost yet highly capable Linux platform. It
can be a very nice platform for a small security tool. OpenVAS is an open-source
fork of the Nessus project. It is a sophisticated vulnerability scanning tool,
with a large collection of publicly maintained test libraries plus the ability
to write your own tests in the NASL scripting language.

While my examples and screen shots are from a Raspberry Pi, this page explains
how to set up and use OpenVAS on any platform.

We need to install the needed software packages. Then, generate a server
certificate and add a user, but we only have to do these two steps the first
time. Then, update the plugin list and start the scanning service. Be patient,
the enormous library of vulnerability scanning plugins makes those two steps
take a while!

Then we're ready to start scanning our network for vulnerabilities!


INSTALL THE NEEDED PACKAGES

Install the openvas-server package This will also install the needed plugin
packages openvas-plugins-base and openvas-plugins-dfsg, and the needed library
packages libopenvas2 and libopennasl2. You also need to install openvas-client
somewhere, but it doesn't have to be on the same platform.

The OpenVAS scanning engine, known as the server, does the work of probing the
network and testing nodes you want to scan.

The management console, known as the client, can run on another machine and
connect to the server across the network.

Those are the package names on the Raspbian and Mageia distributions. On other
distributions you may find it packaged differently, or you might even need to
build it from source.




FIRST TIME ONLY: GENERATE A SERVER CERTIFICATE

Communication between the server (the scanning engine) and the client (the
management console) is secured with SSL. You need to generate a certificate for
this. Use the openvas-mkcert script. I will assume that you have tired of typing
sudo before every single command and you have simply run bash or some other
preferred shell through sudo.

You will be asked a series of questions. Simply pressing <Enter> accepts the
default shown in square brackets:

root@raspberrypi:~# openvas-mkcert

---------------------------------------------------------------------
              Creation of the OpenVAS SSL Certificate
---------------------------------------------------------------------

This script will now ask you the relevant information to create the SSL
certificate of OpenVAS.
Note that this information will *NOT* be sent to anybody (everything
stays local), but anyone with the ability to connect to your OpenVAS
daemon will be able to retrieve this information.


CA certificate life time in days [1460]: 
Server certificate life time in days [365]: 1460
Your country (two letter code) [FR]: US
Your state or province name [none]: IN
Your location (e.g. town) [Paris]: West Lafayette
Your organization [OpenVAS Users United]: 

Congratulations. Your server certificate was properly created.

/etc/openvas/openvasd.conf updated
The following files were created:

. Certification authority:
   Certificate = /var/lib/openvas/CA/cacert.pem
   Private key = /var/lib/openvas/private/CA/cakey.pem

. OpenVAS Server : 
    Certificate = /var/lib/openvas/CA/servercert.pem
    Private key = /var/lib/openvas/private/CA/serverkey.pem

Press [ENTER] to exit

root@raspberrypi:~# ls -lR  /var/lib/openvas/CA/ /var/lib/openvas/private/
/var/lib/openvas/CA/:
total 12
-rw-r--r-- 1 root root 1525 Apr 23 11:47 cacert.pem
-rw-r--r-- 1 root root 4324 Apr 23 11:47 servercert.pem

/var/lib/openvas/private/:
total 4
drwxr-xr-x 2 root root 4096 Apr 22 21:11 CA

/var/lib/openvas/private/CA:
total 8
-rw------- 1 root root 891 Apr 23 11:47 cakey.pem
-rw------- 1 root root 887 Apr 23 11:47 serverkey.pem





FIRST TIME ONLY: ADD AN OPENVAS USER

A user account needs to be defined on the server. Again, there is an easy-to-use
script for this. Note that the user name does not need to correspond to any
existing Linux user, and the password defined here is useful only for
authenticating to the OpenVAS server process. You can ask for certificate based
authentication, and specify a user certificate for the user.

root@raspberrypi:~# openvas-adduser
Using /var/tmp as a temporary file holder.

Add a new openvasd user
---------------------------------


Login : cromwell
Authentication (pass/cert) [pass] : 
Login password :             
Login password (again) :             

User rules
---------------
openvasd has a rules system which allows you to restrict the hosts
that cromwell has the right to test.
For instance, you may want him to be able to scan his own host only.

Please see the openvas-adduser(8) man page for the rules syntax.

Enter the rules for this user, and hit ctrl-D once you are done:
(the user can have an empty rules set)
^D

Login             : cromwell
Password          : ***********

Rules             : 


Is that ok? (y/n) [y]
user added





EVERY TIME: UPDATE THE OPENVAS SECURITY CHECKS

New vulnerabilities are discovered every day, and so new tests for those newly
discovered vulnerabilities are always appearing. Plugins implementing those
tests can easily be downloaded from the OpenVAS site and installed with this
command:

root@raspberrypi:~# openvas-nvt-sync


The above command will require a significant amount of time as it will download
and install tens of thousands of security plugins. Maybe 15 minutes or more even
on a cable modem as over 300 megabytes of plugins are downloaded and stored
under /var/lib/openvas.


START THE OPENVAS SERVER

Let's start the scanning engine! You may see an error or two, caused in these
cases by overly wordy vulnerability test designers. Again, given the size of the
collection of plugins, expect this to take a while to get started. You clearly
do not want to put this into a startup script unless OpenVAS scanning is the
only purpose for your Raspberry Pi, or unless you start the daemon in the
background.

root@raspberrypi:~# openvasd
freebsd_linux-flashplugin17.nasl: The length of the value for the property
	"description" exceeds the allowed maximum length (is 3724 characters,
	maximum length is 3192).
freebsd_linux-flashplugin17.nasl failed to load
freebsd_chromium.nasl: The length of the value for the property "cve_id"
	exceeds the allowed maximum length (is 2473 characters, maximum
	length is 1404).
freebsd_chromium.nasl failed to load
freebsd_chromium22.nasl: The length of the value for the property
	"description" exceeds the allowed maximum length (is 3332
	characters, maximum length is 3192).
freebsd_chromium22.nasl failed to load
find_service_nmap.nasl: The length of the value for the property
	"dependencies" exceeds the allowed maximum length (is 525
	characters, maximum length is 512).
find_service_nmap.nasl failed to load
gb_VMSA-2012-0005.nasl: The length of the value for the property "name"
	exceeds the allowed maximum length (is 137 characters, maximum
	length is 128).
gb_VMSA-2012-0005.nasl failed to load
[... 30 minutes or more passes ...]
All plugins loaded





START THE OPENVAS CLIENT

I will do this from my desktop workstation.

me@linux-desktop:~$ OpenVAS-Client &





CONFIGURE AN OPENVAS SCAN

It is time to define a new task.

Select Task | New or simply click the New button, appearing like a white sheet
with white/green "+". Then click "unnamed task" and change it to something
meaningful.

This is simply the name of a scanning task. We need to define what it will do.

Select Scope | New. Then click "unnamed scope" and change it to something
meaningful.

With your named scope selected, click File | Connect.

The following dialog will appear with the hostname set to localhost by default.
Change that to the DNS name or IP address of your OpenVAS server platform, then
enter the login and password for your scanner user.



Once again, be patient! The SSL connection and authentication actually happen
very quickly, but the console doesn't refresh and you can't see that it is
busily cataloging over 30,000 plugins.

This is a case where it is a good thing when the client console appears to be
"frozen". Running top on the server will show that the CPU is about 40% busy
with the openvasd process.

Eventually an information box will pop up announcing the number of enabled
plugins, and the console window will refresh. Click "OK".

A list of dependencies will be transferred much more quickly, with the window
refreshing and keeping you informed.

You will see the tree of plugins at upper right, click the triangles to expand
that node in the tree.

You can see here that I arbitrarily named my task "Full sweep" and its scope
"10.1.1/24, 192.168.1/24". Yes, the scope name serves as a reminder to me of
what ranges of IP addresses it will scan, but the name is arbitrary. I still
need to tell the scanner what targets to use.




First, though, let's go to the General category.

We find that the scanner will use Ping and the OpenVAS TCP scanner for port
scanning. Since my targets include some routers and VLAN switches, I will add
the scanner based on snmpwalk.

I will also change the settings for "Hosts to test concurrently" and "Checks to
perform concurrently." By default they are 20 and 4, respectively. But remember
that the Raspberry Pi has just one CPU, not terribly fast, and 512 MB of RAM. No
good will come of a load average above 35!

I will dial these settings back to 2 and 2.

Next, go to the Credentials category.

We need to configure SSH authentication so local tests can be run.

I have specified using my existing account cromwell and authenticating using an
SSH key.

See my pages on SSH configuration for details on how to generate and use SSH
keys.



Select the Target selection category, and provide a list of target hosts to be
scanned.

I have manually entered a list of IP addresses. Notice that you can read a list
of hostnames or IP addresses from a file, or you can do a zone transfer from a
DNS server.




RUN THE SCAN!

Expect to see a rather busy processor on the system running the scan, whether it
is a Raspberry Pi or a high-end notebook or desktop. Here I'm running it on a
single-core Raspberry Pi Model 1.




The last 4% or so of the checks for a host may seem to slow down if you are only
watching the progress bar and the host is running SSH and HTTP/HTTPS. Use
tail -f to follow the ends of the log files /var/log/authlog and
/var/www/logs/error_log or similar on the current targets. You will observe a
lot of relatively slow SSH default password guessing followed by HTTP testing.

You may need to disable intrusion detection systems on the target hosts to make
the tests most meaningful. Even with IDS turned off, your logging will become
rather noisy during the test.

The top output at right shows that configuring the server to run two tests on
each of two hosts concurrently has yielded a load average close to 4. That's
what we should expect.

Conventional wisdom says that about 4 runnable processes per CPU core is about
all you want to try to achieve. Here is the output of vmstat after I have
removed the fairly useless first line showing the average since boot time:

cromwell@raspberrypi ~ $ vmstat 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 6  0  48872  39832  28496 163808    0    0     0     2  633  525 65 35  0  0
 3  0  48872  41128  28512 163860    0    0     0     2  649  515 69 31  0  0
 4  0  48872  41600  28528 162624    0    0     0    23  631  521 66 34  0  0
 5  0  48872  43500  28544 162676    0    0     0     2  653  522 68 32  0  0
 4  0  48872  40524  28560 162728    0    0     0     3  648  520 71 29  0  0
 1  0  48872  39384  28580 162776    0    0     0    23  659  494 69 23  0  7
 3  0  48872  39688  28596 162828    0    0     0     2  629  515 73 27  0  0
 4  0  48872  43204  28612 161168    0    0     0     2  657  529 72 28  0  0
 2  0  48872  43244  28628 161232    0    0     0    22  663  530 70 30  0  0
 4  0  48872  46656  28644 160048    0    0     0     4  624  530 62 38  0  0
 4  0  48872  47256  28660 156688    0    0     0     3  648  518 66 34  0  0
 3  0  48872  46752  28676 156732    0    0     0    24  636  503 72 28  0  0
^C


This looks good — the CPU never is idle, but at the same time it almost never is
forced to wait while it is blocked for I/O because of overly aggressive paging.
And we aren't swapping, which would be far worse!

If you leave the test aggressiveness set at 4 tests each on 20 hosts
concurrently, you will see swapping and a huge slowdown in overall progress
through the test. Unless you are only attempting a very limited test, this
slowdown will be followed by failure as the kernel kills processes as memory is
exhausted. You don't want to see the following in your syslog output, but you
will if you don't dial back the default settings:

Apr 23 13:56:53 raspberrypi kernel: [12584.034272] Out of memory:
		Kill process 31503 (openvasd) score 76 or sacrifice child
Apr 23 13:56:53 raspberrypi kernel: [12584.034287] Killed process 31503
		(openvasd) total-vm:64500kB, anon-rss:53688kB, file-rss:0kB





EXAMINE THE RESULTS

The report is presented as an expandable tree. Click on the triangle beside an
IP address to expand its report, and so on for the protocols and other details.

Above we see the report details for host 10.1.1.250, the SNMP protocol running
on UDP port 161, and some explanation about what was found.

The report can be exported in NBE, the native Nessus format, or in XML, HTML,
LaTeX, ASCII text, or Postscript.

See the OpenVAS documentation for all the details on using OpenVAS.


SELECT A RASPBERRY PI TOPIC:

Hardware and Background
Linux and Other Operating Systems on a Low-cost 86×54 mm Board
Networking: Wired and Wireless
IPv4 and IPv6, Static and DHCP, WPA-2 Security
How to Build an OpenVAS Vulnerability Scanner with a Raspberry Pi
How to Build a Network-Attached Storage Server with a Raspberry Pi
How to Build an Active Directory Server on a Raspberry Pi Running FreeBSD with
Samba
Cut the Cable: How to Replace Cable TV with Kodi Running on a Raspberry Pi
Getting Started with a Raspberry Pi and an RTL-SDR Receiver
ADS-B Flight Tracking with a Raspberry Pi and Software-Defined Radio
Running both fr24feed on Linux/x86_64 and piaware on Linux/ARM
1090 MHz ADS-B Antenna

Back to the Linux / Unix page Radio Topics

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