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Vulnerability Assessment Using SAINT

Vulnerability Assessment Using SAINT. Jane Lemmer Information Security Specialist World Wide Digital Security, Inc. lemmerj@wwdsi.com. Outline. The Problem The First Solution The Second Solution Other Uses for SAINT What’s Next Conclusions. The Problem. Large network

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Vulnerability Assessment Using SAINT

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  1. Vulnerability AssessmentUsing SAINT Jane Lemmer Information Security Specialist World Wide Digital Security, Inc. lemmerj@wwdsi.com

  2. Outline • The Problem • The First Solution • The Second Solution • Other Uses for SAINT • What’s Next • Conclusions

  3. The Problem • Large network • 7 Class B subnets, over 20 Class C subnets • No central management • Some resistance to “outsiders” • How do we do a vulnerability assessment?

  4. The First Solution • The Scanning Tool • The Scanning Method • Results • Problems • Lessons Learned

  5. The First Solution The Scanning Tool • Conducted a comparison of several network based vulnerability assessment tools • Internet Security Scanner • Kane Security Analyst • SATAN • Nessus, and a few others

  6. The First Solution The Scanning Tool • Chose SATAN, with COAST extensions • free • fairly easy to use • sufficient for providing a first look at overall network vulnerability

  7. The First Solution The Scanning Method

  8. The First Solution Results • Lasted three weeks • Approximately 20,000 potential hosts interrogated • Found about 5,000 hosts with services • Inexpensive (almost automatic)

  9. The First Solution Problems • Took almost a month to process the results into a useable format • Missed many hosts (DHCP, hosts not in DNS, especially Linux boxes) • Organizational problems (results not getting to the right people) • Scapegoats for a host of network problems

  10. The First Solution Lessons Learned • DNS method is not finding all the hosts • SATAN is not current • Report generation takes too long • We need the following: • a new scanning tool • a new scanning method • a new reporting method

  11. The Second Solution • The Scanning Tool • The Scanning Method • Results • Problems • Lessons Learned

  12. The Second Solution The Scanning Tool • An updated version of SATAN • Added many new tests • Added a new attack level • Changed how vulnerable services are categorized • Works in firewalled environments • Identifies Windows boxes • Developed extensive tutorials for each vulnerable service • Developed an in-house tool to help with reports

  13. The Second Solution The Scanning Tool • The three “r” services (rlogin, rshell, rexec) • Vulnerable CGIs • IMAP vulnerabilities • SMB open shares • Back Orifice and NetBus • ToolTalk • Vulnerable DNS servers • rpc.statd service • UDP echo and/or chargen • IRC chat relays

  14. The Second Solution The Scanning Method

  15. The Second Solution Results • Lasted two months • Almost 500,000 potential hosts interrogated • Found many more hosts • approximately 7,000 boxes with services • approximately 4,000 boxes with no services • almost 8,000 Windows boxes • More costly (labor intensive)

  16. The Second Solution Problems • Scanning takes longer • Difficult to compare results with previous scan • Organizational problems (results still not getting to the right people) • Caused some problems with NT boxes • Still a scapegoat for network problems

  17. The Second Solution Lessons Learned • New method finds more hosts but takes longer • SAINT needs to be continually updated • Scanning can help improve the tool • Still need to work on reporting results

  18. Other Uses for SAINT • SAINT gathers a lot of information that is not reported • used to produce a list of UNIX hosts by OS type • used to identify web servers • used to identify routers • Quick scans of a host or subnet

  19. Other Uses for SAINT Investigating Incidents

  20. What’s Next • Continue using SAINT for large scans • Supplement SAINT with more robust tools • Scans have led to development of an IRT • defining policy • defining standard security configurations • helping users secure hosts • developing centralized site for security information

  21. Conclusions • SAINT is a useful tool for scanning large networks • Results give a good first look at how vulnerable you are • SAINT must be continually updated • better OS typing • better reporting • method to compare scan results

  22. Contact Information • World Wide Digital Security, Inc. • 11260 Roger Bacon Drive, Suite 400 • Reston, VA 20910 USA • PHONE: +1 703 742-6604 • FAX: +1 703 742-6605 • http://www.wwdsi.com

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