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Computer Security Threats CLICKTECHSOLUTION.COM. Computer Security Confidentiality –Data confidentiality –Privacy Integrity –Data integrity –System integrity.

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Presentation on theme: "Computer Security Threats CLICKTECHSOLUTION.COM. Computer Security Confidentiality –Data confidentiality –Privacy Integrity –Data integrity –System integrity."— Presentation transcript:

1 Computer Security Threats CLICKTECHSOLUTION.COM

2 Computer Security Confidentiality –Data confidentiality –Privacy Integrity –Data integrity –System integrity Availabilty CLICKTECHSOLUTION.COM

3 The Security Requirements Triad CLICKTECHSOLUTION.COM

4 Additional Concepts Authenticity Accountability CLICKTECHSOLUTION.COM

5 Threats CLICKTECHSOLUTION.COM

6 Threats CLICKTECHSOLUTION.COM

7 Threats CLICKTECHSOLUTION.COM

8 Threats CLICKTECHSOLUTION.COM

9 Scope of System Security CLICKTECHSOLUTION.COM

10 Assets CLICKTECHSOLUTION.COM

11 Intruders Masquerader Misfeasor Clandestine user CLICKTECHSOLUTION.COM

12 Intruders CLICKTECHSOLUTION.COM

13 Intruders CLICKTECHSOLUTION.COM

14 Intruders CLICKTECHSOLUTION.COM

15 Backdoor Trapdoor Secret entry point Useful for debugging tool for programmers CLICKTECHSOLUTION.COM

16 Logic Bomb Explodes when certain conditions are met –Presence or absence of certain files –Particular day of the week –Particular user running application CLICKTECHSOLUTION.COM

17 Trojan Horse Useful program that contains hidden code that when invoked performs some unwanted or harmful function Can be used to accomplish functions indirectly that an unauthorized user could not accomplish directly –User may set file permission so everyone has access CLICKTECHSOLUTION.COM

18 Mobile Code Transmitted from remote system to local system Executed on local system without the user’s explicit instruction CLICKTECHSOLUTION.COM

19 Multiple-Threat Malware Multipartite virus infects in multiple ways Blended attack uses multiple methods Ex: Nimda has worm, virus, and mobile code characteristics CLICKTECHSOLUTION.COM

20 Parts of Virus Infection mechanism Trigger Payload CLICKTECHSOLUTION.COM

21 Virus Stages Dormant phase –Virus is idle Propagation phase –Virus places an identical copy of itself into other programs or into certain system areas on the disk 21 CLICKTECHSOLUTION.COM

22 Virus Stages Triggering phase –Virus is activated to perform the function for which it was intended –Caused by a variety of system events Execution phase –Function is performed 22 CLICKTECHSOLUTION.COM

23 Virus Classification by Target Boot sector infector File infector Macro virus CLICKTECHSOLUTION.COM

24 Virus Classification by Concealment Strategy Encrypted virus –Random encryption key encrypts remainder of virus Stealth virus –Hides itself from detection of antivirus software CLICKTECHSOLUTION.COM

25 Virus Classification by Concealment Strategy Polymorphic virus –Mutates with every infection Metamorphic virus –Mutates with every infection –Rewrites itself completely after every iteration CLICKTECHSOLUTION.COM

26 Macro Viruses Platform independent –Most infect Microsoft Word documents Infect documents, not executable portions of code Easily spread File system access controls are of limited use in preventing spread 26 CLICKTECHSOLUTION.COM

27 E-Mail Viruses Attachment Open e-mail Uses e-mail software to replicate CLICKTECHSOLUTION.COM

28 Worms Use network connections to spread from system to system Electronic mail facility –A worm mails a copy of itself to other systems 28 CLICKTECHSOLUTION.COM

29 Worms Remote execution capability –A worm executes a copy of itself on another system Remote log-in capability –A worm logs on to a remote system as a user and then uses commands to copy itself from one system to the other CLICKTECHSOLUTION.COM

30 Worm Propagation Model CLICKTECHSOLUTION.COM

31 Bots Zombie or drone Program secretly takes of another Internet-attached computer Launch attacks that are difficult to trace to bot’s creator Collection of bots is a botnet CLICKTECHSOLUTION.COM

32 Rootkit Set of programs installed on a system to maintain administrator (or root) access to that system Hides its existence CLICKTECHSOLUTION.COM

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