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What are the prevention techniques for the Buffer overflow attacks?

Asked 2010-09-14T01:22:00.010
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what are the ideas of preventing buffer overflow attacks? and i heard about Stackguard,but until now is this problem completely solved by applying stackguard or combination of it with other techniques?

after warm up, as an experienced programmer

Why do you think that it is so difficult to provide adequate defenses for buffer overflow attacks?

Edit: thanks for all answers and keeping security tag active:)

security programming-languages buffer-overflow
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In modern exploitation the big three are:

ASLR

Canary

NX Bit

Modern builds of GCC applies Canaries by default. Not all ASLR is created equally, Windows 7, Linux and *BSD have some of the best ASLR. OSX has by far the worst ASLR implementation, its trivial to bypass. Some of the most advanced buffer overflow attacks use exotic methods to bypass ASLR. The NX Bit is by far the easist method to byapss, return-to-libc style attacks make it a non-issue for exploit developers.

answered 2010-09-14T05:32:18.307

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