OpenVAS: Vulnerability Assessment Scanner

OpenVAS_Group4_Chandrak-Melbin 1

OPENVAS: VULNERABILITY

ASSESSMENT SCANNER By

Chandrak Trivedi_101015275Melbin Sunny_101013552


Learning Objective•Understand the importance of Vulnerability Assessment (VA).

•Explain how OpenVAS is used for VA.•Understand the logical architecture of OpenVAS framework.

•Conduct VA using OpenVAS.•Evaluate the purpose and value of OpenVAS report.•Determine how to mitigate vulnerabilities.


Vulnerability Assessment (VA)•What is Vulnerability Assessment (VA)?

•Why we need Vulnerability Assessment (VA)?

•RISK = ASSET * THREAT * VULNERABILITY


OpenVASBenefits

•Open Source and uses Nessus V2 as its plugin engine.

•Compatible with different Operating System.

•Keeps a history of past scans.

Limitations•False negatives may be reported.

•Determine/find less vulnerabilities as compared is Nexpose or Nessus.

•Requires 2-3 services to perform vulnerability assessment.


An overview of OpenVASThe Open Vulnerability Assessment Scanner known more commonly as OpenVAS, is a suite of tools that work together to run tests against client computers using a database of known exploits and weaknesses. The goal is to learn about how well your servers are guarded against known attack vectorsOpenVAS is be used as VULNERALABILITY ASSESSMENT tool and but also can be used as PENETRATION TESTING tool.


OpenVAS Architecture Clients

Services

Data


Clients Components •OpenVAS CLI: is a set of tools that allow administration of OpenVAS through the shell.

•Greenbone Security Assistant: is a web-based tool with an intuitive interface for various VA that you are making.

•Greenbone Desktop Security: is the tool that allows us to manage everything through the GUI interface on the desktop.


Services Components•OpenVAS Scanner: is the component that allows us the scan of hostname/ip, port range “from-to” or entire networks such as “192.168.1.0/28”.

•OpenVAS Manager: is the heart of OpenVAS, the manager receives task/information from the OpenVAS Administrator and the various administration tools CLI/WEB/GUI, then use the OpenVAS Scanner that will perform the Vulnerability Assessment. Also includes component that processes the results of the scans, so it also generates the final report.

•OpenVAS Administrator: is the component through which users can manage and the feed (i.e. the updates).


Data Components•NVT’s: it is the container of feed, i.e. test cases that detect the vulnerabilities, which are currently over 20,000.

•Results, config: is the database (PostgreSQL) where reports are collected and where the entire configuration of OpenVAS is stored.


OpenVAS Feeds


Conducting VA using OpenVAS


Step 1: Setting up Kali for Vulnerability Scanning

https://www.kali.org/penetration-testing/openvas-vulnerability-scanning/


Step 1: Starting the OpenVAS services

• Once openvas-setup completes its process, the OpenVAS manager, scanner, and GSAD services should be listening:

• If you have already configured OpenVAS, you can simply start all the necessary services by running openvas-start.


Step 1: Connecting to the OpenVAS Web Interface• Point your browser to https://127.0.0.1:9392, accept the self signed SSL certificate and plugin the credentials for the admin user. The admin password was generated during the setup phase.


Step 2: Tabs•Explanation of Administration Tab -

•Adding Users, Groups and Roles.

•Updating Network Vulnerability Tests (NVTs), Security Content Automation Protocol (SCAP) and Computer Emergency Response Team (CERT) Feeds.


Administration tab


Add New Users


New User details


NVT Feed


Step 2: Tabs•Explanation of Configuration tab -

•Targets, Port lists and Credentials

•Scan Config

•Alerts and Schedules

•Permissions


Configuration tab


Targets


Port List


Scan Configuration


Permissions


Step 2: Tabs•Explanation of SecInfo Management tab -

•SecInfo Dashboard

•Network Vulnerability tests (NVTs)

•Common Vulnerabilities and Exposures (CVEs)


SecInfo Management


SecInfo Dashboard


NVTs – Network Vulnerability test


CVEs – Common Vulnerabilities and Exposure


Step 2: Tabs•Explanation of Scan Management -

•Tasks

•Reports

•Results


Scan Management tab


New Tasks


Reports


Results


Step 3: Scanning•Explanation for Scanning a Target to find Vulnerabilities.

•Procedures•I: New Target (Creating Target)•II: New Task (Creating Task)•III: Scanning


I. New Target


Port List Options


Target Added


II. New Task


Scan Config Options


Task Created


III. Start Scanning


Total Task List


Scanned Target Summary Report


Results of Target


Step 4: Export report of VA conducted•Explanation on Exporting the scanned target vulnerabilities into file.

•Different extension are possible to export like .pdf, .xml etc.•PDF will be used to submit to your higher management.•XML can be used to import in Metasploit for doing pen testing.

•Also you can study by just clicking the vulnerability.


Studying Vulnerability


Exporting as file


PDF file


Exploitation on Vulnerable System•Using NVTs, CVEs and Metasploit

•Video on Denial of Service (DOS) on scanned results.


Windows XP – No Firewall and Updates


Windows XP - No Firewall and Updates


VA


Metasploit


Step 5: Mitigation• As per references provided by OpenVAS,

• Patching the updates and Firewall protected.


Windows XP – Firewall and Auto Updates


VA


Metasploit


Question ???

OpenVAS: Vulnerability Assessment Scanner

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