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Old March 15th, 2010, 03:00 PM   #1
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In Repsonse to the Mozilla Firefox 3.6 0-day exploit and other software exploits:

Question: A lot of people often ask how malware actually ends up on a compromised machine?

Answer: The most common ways this occurs is through "buffer overflows" [1][3]. An effective way to create a counter attack against this for security reasons so that it doesn't happen is safeguard against "buffer overflows" in most programming languages off the bat is not to leave any "dangling pointers" if you are doing memory allocation routines for example in a language like C. This article shows you how memory can spill over into adjacent block on the stack and provides you with some examples if you want to see how to protect against if for security reasons and your a software developer or I.T person in the "know". You need to know how to work with a compiler like GCC in Linux for example and how to write code in C [3] at last at the introductory level or else you will be completely lost and trust me it's best to not try compiling or playing around with this until you understand it up to intermediate level at least with pointers! One way developers are avoiding this is to use "type" safe languages, but even then there are still issues with that.

Example: The "Code Red" virus in 2001 did just that. It exploited a buffer overflow in Microsoft IIS 4.0 Web Servers back in 2001 [2] and allowed the attacker to server causing it to redirect to sites were it could be used to spread malware! (DNS Cache Poisoning) or sometimes "Pharming". Back then though malware was primitive and they weren't any sophisticated attacks like the one mentioned above nor did large scale botnets exist!


1. Linux Journal. "Buffer Overflow Attacks and Their Countermeasures". http://www.linuxjournal.com/article/6701 accessed 15 Mar 2010. 10 Mar 2003.

2. Zou, CC. "Code Red Worm Propagation Modeling and Analysis". 2002. accessed 21 Aug 2010. http://www.google.com/url?sa=t&sourc...0TPCyQ&cad=rja

3. Erickson, Jon. Hacking: The Art Of Exploitation Second Edition. No Starch Press. 2007. ISBN-13: 9781593271442.
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