CS283 - Lecture 6 - Part 5 - Additional Topics - Malware

CS283 - Lecture 6 - Part 5 - Additional Topics - Malware -...

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Lecture 6 Part 5 - Additional Topics – WU Malware GWU CS 172/283 Autumn 2009 Draws extensively from Memon’s notes, Brooklyn Poly And Pfleeger text, Chapter 3 11/17/2009 CS283- 172/Fall06/GWU/Vora/Identity
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Program Security ¾ Secure Programs: behave as expected ¾ Unexpected behavior is a “program security flaw” ¾ Happens because of an existing “vulnerability” ¾ IEEE Terminology ¾ Human error ¾ Fault (incorrect code, internal, professional’s view) ¾ Failure (incorrect system behavior; external, user’s/lay person’s view) 2 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 5 - Rev 20091117
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Patching ne way of addressing faults: ¾ One way of addressing faults: ¾ test, discover faults, patch them ¾ Problems: ¾ No guarantee all faults are found ¾ No guarantee the patch does not add another fault ime pressure ads to hurried patches ¾ Time pressure leads to hurried patches ¾ Because the entire system cannot be redesigned, there’s a limit to how much a single patch can fix because it is onstrained not to affect the rest of the system (for example, constrained not to affect the rest of the system (for example, a definition of a variable that is passed on to several different modules, but creates a fault only in one) ystem performance rovides pragmatic limits 3 ¾ System performance provides pragmatic limits GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 5 - Rev 20091117
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Faults will always exist ¾ A result of ¾ Human error ¾ Complexity of the system ¾ The study of security finds more possibilities for flaws while software engineering proceeds to find new software development/production techniques ¾ i.e. neither field is done with what they are doing, so that that the other can be expected to address completely it completely. ¾ Non-malicious and malicious faults 4 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 5 - Rev 20091117
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Malicious Logic ¾ Pfleeger definition: “ Hardware, software, or firmware capable of performing an unauthorized function on an information system. NSTISSI 4009 ¾ Bishop definition: “ a set of instructions that cause a site’s policy to be violated ¾ Also known as malicious code or malware ¾ Unintentionally faulty code can cause the ame/similar effects same/similar effects 5 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 5 - Rev 20091117
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ypes of malicious logic Types of malicious logic (existing since at least 1970) Trojan Horses ¾ Bishop definition: “a program with an overt (documented or known) effect and a covert (undocumented or unexpected) effect Propagating/replicating rojan Horse: one that ¾ A Propagating/replicating Trojan Horse: one that creates a copy of itself ¾ Might modify the compiler to insert itself into programs, including future versions of the compiler 6 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 5 - Rev 20091117
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ypes of malicious logic Types of malicious logic (existing since at least 1970)
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CS283 - Lecture 6 - Part 5 - Additional Topics - Malware -...

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