1. OpenVAS —A how-to guide about the most popular vulnerability test tool
Team Members: Yingchao Zhu; Chen Qian; Xingyu Wu; XuZhuo Zhang; Igibek Koishybayev;
EC521: Cybersecurity OpenVAS

2. EC521: Cybersecurity OpenVAS
OpenVAS Architecture
EC521: Cybersecurity OpenVAS

3. EC521: Cybersecurity OpenVAS
Our Environment
DVWA + XAMPP
OpenWebMail
Metasploitable
Blackboard
EC521: Cybersecurity OpenVAS

4. Question: How to perform a normal scan with OpenVAS?
EC521: Cybersecurity OpenVAS

5. How to find the command set?
Solution: #openvas ‘double tab’
OpenVAS-Scanner: openvassd
openvas-mkcert
openvas-nvt-sync
OpenVAS-Manager: openvasmd
OpenVAS-Client: openvas-cli
Greenbone-Security-Assistant: gsad
EC521: Cybersecurity OpenVAS

6. EC521: Cybersecurity OpenVAS
How to find the command set?
openvas-setup
openvas-check-setup
openvas-nvt-sync
openvas-nasl
Reference:
http: //
EC521: Cybersecurity OpenVAS

7. EC521: Cybersecurity OpenVAS
Target -- XAMPP
XAMPP's name is an acronym for:
X (to be read as "cross", meaning cross-platform)
Apache HTTP Server
MySQL
PHP
Perl
It is a completely free, easy to install Apache distribution containing MySQL, PHP, and Perl.
Reference:
EC521: Cybersecurity OpenVAS

8. EC521: Cybersecurity OpenVAS
Set a target
EC521: Cybersecurity OpenVAS

9. EC521: Cybersecurity OpenVAS
Create a task
EC521: Cybersecurity OpenVAS

10. EC521: Cybersecurity OpenVAS
Get the result
EC521: Cybersecurity OpenVAS

11. Question: How to insert plugins into OpenVAS?
EC521: Cybersecurity OpenVAS

12. Webmail Vuln. & OpenVAS Plugins
Content
Webmail environment
Web-app scanning
Insert plugins
EC521: Cybersecurity OpenVAS

13. EC521: Cybersecurity OpenVAS
Webmail Environment
Mail Server Set-Up Environment (Local)
OS : CentOS-6.5
SMTP : Postfix Sasl
IMAP/POP3 : Dovecot-2.0
Web : Apache-2.2
Webmail : Openwebmail-2.30 (perl)/
[Squirrelmail (php)]
localhost/cgi-bin/openwebmail/openwebmail.pl
EC521: Cybersecurity OpenVAS

14. EC521: Cybersecurity OpenVAS

15. Network Vulnerability Tests
NVTs
The OpenVAS project maintains a public feed of more than 35,000 NVTs (as of April 2014)
Command openvas-nvt-sync for online-synchronisation from the feed service.
Based on NASL scripts
(Nessus Attack Scripting Language)
EC521: Cybersecurity OpenVAS

16. Q1: Locate required NVT scripts
Security Tools INTERGRATED:
Portscanner: NMAP, pnscan, strobe
IPsec VPN scanning&fingerprinting: ike-scan
Web server scanning: Nikto
OVAL Interpreter: ovaldi
web application attack and audit framework: w3af
EC521: Cybersecurity OpenVAS

17. A1: Locate required NVT scripts
(from Kali)
Location: /var/lib/openvas/plugins
Find: ls | grep ‘specific_scripts’
EC521: Cybersecurity OpenVAS

18. A1: Locate required NVT scripts
(from Greenbone Security Assistant)
Secinfo Management => NVTs => Help: Powerfilter
Family=“Web application abuses”
Name~“openwebmail”
EC521: Cybersecurity OpenVAS

19. A1: Locate required NVT scripts
# … introduction comments, description …
if (description) {
script_id(16463);
script_version("$Revision: 17 $");
script_tag(name:"last_modification", value:"$Date: :01: (Sun, 27 Oct 2013) $");
script_tag(name:"creation_date", value:" :08: (Thu, 03 Nov 2005)");
script_tag(name:"cvss_base", value:"4.3");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
script_tag(name:"risk_factor", value:"Medium");
script_cve_id("CVE ");
script_bugtraq_id(12547);
script_xref(name:"OSVDB", value:"13788");
# …
EC521: Cybersecurity OpenVAS

20. Q2: Scan Webmail (Application)
EC521: Cybersecurity OpenVAS

21. A2: Scan Webmail (Application)
Configuration => Scan Configs => New Scan Config
Scan Settings:
Http Login Page
Login configurations
EC521: Cybersecurity OpenVAS

22. A2: Scan Webmail (Application)
EC521: Cybersecurity OpenVAS

23. Q3: Implement OpenVAS Plugins
Plugin Extension?
EC521: Cybersecurity OpenVAS

24. A3: Insert OpenVAS Plugins
1. script.nasl
2. # openvas-nasl -X script.nasl (insert without cert)
3. # vim /etc/openvas/openvassd.conf nasl_no_signature_check = no
EC521: Cybersecurity OpenVAS

25. A3: Insert OpenVAS Plugins
4. Key generation
# gpg --homedir=/etc/openvas/gnupg --gen-key
# wget
# gpg --homedir=/etc/openvas/gnupg --import OpenVAS_TI.asc
EC521: Cybersecurity OpenVAS

26. A3: Insert OpenVAS Plugins
5. Set Trust
# gpg --homedir=/etc/openvas/gnupg --list-keys
# gpg --homedir=/etc/openvas/gnupg --lsign-key XXXXXXXXX
6. Detach Signature
# gpg --homedir=/etc/openvas/gnupg/ --detach-sign -a -o script.nasl.asc script.nasl
EC521: Cybersecurity OpenVAS

27. A3: Insert OpenVAS Plugins
7. Add Certificate
# gpg --homedir=/etc/openvas/gnupg --import script.nasl.asc
8. Parse & Execute
# openvas-nasl –p –t script.nasl
9. Copy plugins to /var/lib/openvas/plugins
Load Scanner & Rebuild Manager
# openvassd #openvasmd --rebuild
EC521: Cybersecurity OpenVAS

28. A3: Insert OpenVAS Plugins
Plugin found!
Flexible and Extendable
EC521: Cybersecurity OpenVAS

29. Webmail Vuln. & OpenVAS Plugins
References
Openwebmail:
Web App Scan:
NVT Feed:
NVT Signature:
EC521: Cybersecurity OpenVAS

30. Question: How to understand NASL Script language?
EC521: Cybersecurity OpenVAS

31. EC521: Cybersecurity OpenVAS
NASL Language
NASL is a scripting language designed for the Nessus security scanner. Its aim is to allow anyone to write a test for a given security hole in a few minutes, to allow people to share their tests without having to worry about their operating system, and to guarantee everyone that a NASL script can not do anything nasty except performing a given security test against a given target.
Reference:
EC521: Cybersecurity OpenVAS

32. NVT Structure # OpenVAS Vulnerability Test // # $Id$ //
# Description: [one-line-description] //
(copyright and writer information)
if(description) //
script_oid(FIXME); # see //
script_version("$Revision$"); # leave as is, SVN will update this // …
include("FIXME.inc"); # in case you want to use a NASL library
# FIXME: the code. //

33. Metasploitable 2 Designed by HD Moore, Now owned by Rapid 7
(To test their well-known tool metasploit, for free)
A special version of Ubuntu Linux 8.0.4
A target machine with many built-in vulnerabilities
A good platform to conduct security training, test security tools, and practice common penetration testing techniques.

35. Vulnerbilities
Apache 2.2.8, Tomcat Password , Samba NDR Parsing, Heap Overflow, BIND libbind inet_network(), PHP , 5.2.6, 5.2.8, PHP Fixed security issue, VNC password is "password“, Samba 'reply_netbios_packet' Nmbd Buffer Overflow, cve , HTML Output Script Insertion XXS, Key algorithm rollover bug,
DNS service BIND 9.4.2, MySQL a and so on…
About 135 in All. 40 are critical vulnerabilities!

36. List

37. OpenVAS Scan Report
Sadly not as much result as it should be. (Using the full ultimate scan) .
Some NVTs don’t have the full function as the original program or CVE.

38. A Brief Example
We can use this vulnerability to remote login into the target as the root, and execute shell commands using the rsh-client servise.( In Kali Linux, apt-get install rsh-client.)

39. Nmap NVT port scan
No result in the Openvas NVT Nmap feed. It can’t list all the open ports while using the nmap in kali, we can get the full result.
All the open ports are printed out in nmap as well as their protocol or function. NVT can’t take the place of the original program.

40. Is vulnerability working?
Remote Login
TCP ports 512 is known as "r" services, and have been misconfigured to allow remote access from any host (a standard ".rhosts + +" situation).Fisrt, install rsh-client. Then type in rlogin -l root , so…

41. Do something bad
Since we are SSH with the remote target, why not generate the SSH (as we did in homework), so next time we can access unlimitedly!

42. Question: How to use OID to get NVT’s feed?
Use OID To look for the NVT and more information with it

43. NVT Core include("revisions-lib.inc"); // include("misc_func.inc"); //
port = get_kb_item("Services/rexecd"); //
if(!port)port = 512; //
//username is a string consist of 260 “x”
rexecd_string = string(raw_string(0), username, raw_string(0), "xxx", raw_string(0), "id", raw_string(0)); //
soc = open_sock_tcp(port); //
send(socket:soc, data:rexecd_string); //
buf = recv_line(socket:soc, length:4096); //
if(ord(buf[0]) == 1 || egrep(pattern:"too long", string: buf)) //
register_service(port:port, proto:"rexecd"); //
security_warning(port:port, protocol:"tcp"); //

44. Summary 1. Our purpose of the lab generation
2. Completely use of the penetration tool
3. Practical use of OpenVAS
For attacker: Exploit, Sniff
For defender: Assess, Patch
4. Brief assessment of OpenVAS
Open source
Client-server structure
Extended and flexible NVT feed
Security and authentication

45. Blackboard: Demo

46. EC521: Cybersecurity OpenVAS
Questions?
EC521: Cybersecurity OpenVAS