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

EC521: Cybersecurity OpenVAS OpenVAS Architecture EC521: Cybersecurity OpenVAS

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

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

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

EC521: Cybersecurity OpenVAS How to find the command set? openvas-setup openvas-check-setup openvas-nvt-sync openvas-nasl Reference: http: //www.openvas.org/setup-and-start.html https://www.digitalocean.com/community/tutorials/how-to-use-openvas-to-audit-the-security-of-remote-systems-on-ubuntu-12-04 EC521: Cybersecurity OpenVAS

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: https://www.apachefriends.org/index.html http://en.wikipedia.org/wiki/XAMPP EC521: Cybersecurity OpenVAS

EC521: Cybersecurity OpenVAS Set a target EC521: Cybersecurity OpenVAS

EC521: Cybersecurity OpenVAS Create a task EC521: Cybersecurity OpenVAS

EC521: Cybersecurity OpenVAS Get the result EC521: Cybersecurity OpenVAS

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

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

EC521: Cybersecurity OpenVAS Webmail Environment Mail Server Set-Up Environment (Local) OS : CentOS-6.5 SMTP : Postfix-2.6 + Sasl IMAP/POP3 : Dovecot-2.0 Web : Apache-2.2 Webmail : Openwebmail-2.30 (perl)/ [Squirrelmail-1.4.22 (php)] localhost/cgi-bin/openwebmail/openwebmail.pl EC521: Cybersecurity OpenVAS

EC521: Cybersecurity OpenVAS

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

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

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

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

A1: Locate required NVT scripts # … introduction comments, description … if (description) { script_id(16463); script_version("$Revision: 17 $"); script_tag(name:"last_modification", value:"$Date: 2013-10-27 15:01:43 +0100 (Sun, 27 Oct 2013) $"); script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (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-2005-0445"); script_bugtraq_id(12547); script_xref(name:"OSVDB", value:"13788"); # … http://www.openvas.org/openvas-nvt-feed.html EC521: Cybersecurity OpenVAS

Q2: Scan Webmail (Application) EC521: Cybersecurity OpenVAS

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

A2: Scan Webmail (Application) EC521: Cybersecurity OpenVAS

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

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

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

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

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

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

Webmail Vuln. & OpenVAS Plugins References Openwebmail: http://www.openwebmail.org/ Web App Scan: http://www.greenbone.net/learningcenter/task_webappscan.html http://www.tenable.com/blog/scanning-web-applications-that-require-authentication NVT Feed: http://www.openvas.org/openvas-nvt-feed.html NVT Signature: http://www.openvas.org/trusted-nvts.html EC521: Cybersecurity OpenVAS

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

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: http://virtualblueness.net/nasl.html EC521: Cybersecurity OpenVAS

NVT Structure # OpenVAS Vulnerability Test // # $Id$ // # Description: [one-line-description] // (copyright and writer information) if(description) // script_oid(FIXME); # see http://www.openvas.org/openvas-oids.html // 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. //

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.

Vulnerbilities Apache 2.2.8, Tomcat Password , Samba NDR Parsing, Heap Overflow, BIND libbind inet_network(), PHP 5.2.12, 5.2.6, 5.2.8, PHP Fixed security issue, VNC password is "password“, Samba 'reply_netbios_packet' Nmbd Buffer Overflow, cve-2012-1667, HTML Output Script Insertion XXS, Key algorithm rollover bug, DNS service BIND 9.4.2, MySQL 5.0.51a and so on… About 135 in All. 40 are critical vulnerabilities!

List

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.

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.)

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.

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 192.168.99.131, so…

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!

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

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"); //

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

Blackboard: Demo

EC521: Cybersecurity OpenVAS Questions? EC521: Cybersecurity OpenVAS