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POHow do I change EIP in a different process?
 

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  1. POHow do I change EIP in a different process?
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    <p>I'm trying to hack another program by changing the EIP of it. There are two programs running, one is the target, that tells where the function that is the "core-function"(e.g. a function that receive a password string as a parameter and returns true or false) is in memory. Then now that I know where the core-function is I wanna modify the EIP with the other program so the target program can call my function and simply get a true out of it and print out a beautiful "access granted".</p> <p>My code is now like this:</p> <p>Target Program:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; #include &lt;stdlib.h&gt; int checkPwd(char *pwd) { printf("\nstill in the function\n"); if(strcmp(pwd, "patrick") == 0) return true; else return false; } int main() { char pwd[16]; printf("%d", checkPwd); scanf("%s", &amp;pwd); system("pause"); if(checkPwd(pwd)) printf("Granted!\n"); else printf("Not granted\n"); system("pause"); } </code></pre> <p>Attacker Program:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; #include &lt;memory.h&gt; int returnTrue() { return true; } int main() { int hex; scanf("%d", &amp;hex); memcpy((void*)hex, (void*)returnTrue, sizeof(char)*8); system("pause"); } </code></pre> <p>I wanna add that I tried to put the hex code directly(without the scanf part) in the attacker program and did not work, it crashed.</p> <p>So I think I'm missing some part of the theory in here. I'd be glad to know what is it.</p> <p>Thanks in advance.</p>
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    1. USPatrick Bassut
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    1. COFor something like this, you should probably include the assembly dump of the target program.
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    2. COYou overwrite EIP by messing with a return address on the stack.
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      1. USuser7116
    3. CO@sixlettervariables what you mean by that?
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      1. USPatrick Bassut
 

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