You could try www.pulltheplug.com
its a war-game where you will write buffer overflow exploits
Leonard Leblanc wrote:
> Hello All,
>
> I am trying to experience buffer overflows first hand. I have glanced at a
> number of articles and have decided to focus on "Smashing the Stack for Fun
> and Profit" from Phrack Issue 49. I am trying out the examples from the text
> and when I get to example 3 (which is the first real overflow example) it
> doesn't quite work and I'm having a little trouble figuring it out.
>
> The following example should bypass the "x=1" statement and print the
> original value of "x" which is 0 (zero). Here's the code.
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=
> void function(int a, int b, int c) {
> char buffer1[5];
> char buffer2[10];
> int *ret;
>
> ret = buffer1 + 12;
> (*ret) += 8;
> }
>
> void main() {
> int x;
>
> x=0;
> function(1,2,3);
> x=1;
> printf("%d\n",x);
> }
> -=-=-=-=-=-=-=-=-=-=-=-=
>
> When I compile and execute this code it displays one and exits. I have tryed
> this on RedHat 7.3 and Debian 2.2r6, both giving me the same result. Does
> anyone have any insight into why this wouldn't work? After looking into the
> assembly behind it, I think it has something to do with the "word size", but
> can't seem to find any information as to what the "word size" is in Debian
> or RedHat.
>
> Any and All comments/suggestions are more than welcome. Also if anyone knows
> of some other good text files/documents that talk about buffer overflows I
> would be happy to receive links.
>
> Leonard Leblanc
>
>
>
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>
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