Logs

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Stefan Fodor

Technologie Unterhaltung & Humor

Other anomalies ,[object Object],[object Object]

Program or user who generated it ,[object Object],[object Object]

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So you have started-it-up and now you are getting good traffic — Thousands of users, etc. etc. Do you know script kiddies are scanning your website using simple dictionary attacks on SSH ports? Do you know that once in a while there is a Fatal application Error in your PHP log (which may point to bigger problem)? Do you know that the backup you are taking is actually not gonna restore your DB? Do you know that every night at 12 one of the servers has a CPU spike? It’s a good idea to catch some of the serious problems early on and deploy tools to proactively assess them. In this session we will discuss some very basic things, as a CTO you MUST worry about and proactively solve problems around them. These are (in the order of decreasing priority): 1. Security 2. Monitoring/Availability/Load (External/System level) 3. Application errors 4. Backup 5. Source control

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It’s said that everyone remembers where they were when a momentous event occurs. Where were you on the 10 December 2021 or did the most comprehensively dangerous Java vulnerability pass you by? Don’t be fooled into thinking it’s all over. Even by mid year the number of vulnerable servers will still be high because organisations still fail assess their vulnerability state correctly. In this session I’ll cover, in detail, the actual mechanics of the vulnerability and demo a simple attack. I’ll take you through why this vulnerability can be as bad as it gets and explain what the options are to protect you application and how to assess if you’re still at risk. It’s not all bad news. The Log4Shell wake up call shows us that we’re not paying the right sort of attention to security across the board but we can learn to do better. I’ll end the talk with explaining why security really matters, what developers can do improve their understanding of security principles in general and cover some of the practical next steps that are available. Log4Shell is changing our world - let’s make sure its for the right reasons. Opportunity is knocking on your door.

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Logs

1. Big brother is watching you Stefan FODOR(backb0ne fl00d3r ) Lucky-Day from May Log

3. Example..

4. Iptables and logs

5. Introducing snort

6. Live Demo?

7. Question?

9. Warning

10. Errors

11.

12. Code

13. Error/warning message

14.

15. Trace errors

16. Check for intrusions

17. Statistics

18. /var/log

19. /var/log Kernel Logs Log, warn, err dmesg Web server apt logrotate

20. For the untrained eyes

21. For the trained eyes File dependency – legit request Legit request SQL injection? ?

22.

23. Store iptables logs to /var/log/iptables.log

24. $ nmap 192.168.1.20

25. Nmap and iptables

26.

27. Set rules for nmap

28. Configured log file

29. BASE “interface”

30. Run nmap

31. Regular Nmap Scan

32. Stealth Scan + OS Det

33. Live Demo? (As needed)

34. Questions?

Hinweis der Redaktion

Dmesg – messages from kernel

Logs

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