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local msrpc = require "msrpc"
local smb = require "smb"
local string = require "string"
local vulns = require "vulns"
local stdnse = require "stdnse"
description = [[
Tests whether target machines are vulnerable to ms10-061 Printer Spooler impersonation vulnerability.
This vulnerability was used in Stuxnet worm. The script checks for
the vuln in a safe way without a possibility of crashing the remote
system as this is not a memory corruption vulnerability. In order for
the check to work it needs access to at least one shared printer on
the remote system. By default it tries to enumerate printers by using
LANMAN API which on some systems is not available by default. In that
case user should specify printer share name as printer script
argument. To find a printer share, smb-enum-shares can be used.
Also, on some systems, accessing shares requires valid credentials
which can be specified with smb library arguments smbuser and
smbpassword.
References:
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2729
- http://technet.microsoft.com/en-us/security/bulletin/MS10-061
- http://blogs.technet.com/b/srd/archive/2010/09/14/ms10-061-printer-spooler-vulnerability.aspx
]]
---
-- @usage nmap -p 445 <target> --script=smb-vuln-ms10-061
--
-- @args printer Printer share name. Optional, by default script tries to enumerate available printer shares.
--
-- @output
-- PORT STATE SERVICE REASON
-- 445/tcp open microsoft-ds syn-ack
-- Host script results:
-- | smb-vuln-ms10-061:
-- | VULNERABLE:
-- | Print Spooler Service Impersonation Vulnerability
-- | State: VULNERABLE
-- | IDs: CVE:CVE-2010-2729
-- | Risk factor: HIGH CVSSv2: 9.3 (HIGH) (AV:N/AC:M/Au:N/C:C/I:C/A:C)
-- | Description:
-- | The Print Spooler service in Microsoft Windows XP,Server 2003 SP2,Vista,Server 2008, and 7, when printer sharing is enabled,
-- | does not properly validate spooler access permissions, which allows remote attackers to create files in a system directory,
-- | and consequently execute arbitrary code, by sending a crafted print request over RPC, as exploited in the wild in September 2010,
-- | aka "Print Spooler Service Impersonation Vulnerability."
-- |
-- | Disclosure date: 2010-09-5
-- | References:
-- | http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2729
-- | http://technet.microsoft.com/en-us/security/bulletin/MS10-061
-- |_ http://blogs.technet.com/b/srd/archive/2010/09/14/ms10-061-printer-spooler-vulnerability.aspx
--
-- @see stuxnet-detect.nse
author = "Aleksandar Nikolic"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"vuln","intrusive"}
hostrule = function(host)
return smb.get_port(host) ~= nil
end
action = function(host,port)
local ms10_061 = {
title = "Print Spooler Service Impersonation Vulnerability",
IDS = {CVE = 'CVE-2010-2729'},
risk_factor = "HIGH",
scores = {
CVSSv2 = "9.3 (HIGH) (AV:N/AC:M/Au:N/C:C/I:C/A:C)",
},
description = [[
The Print Spooler service in Microsoft Windows XP,Server 2003 SP2,Vista,Server 2008, and 7, when printer sharing is enabled,
does not properly validate spooler access permissions, which allows remote attackers to create files in a system directory,
and consequently execute arbitrary code, by sending a crafted print request over RPC, as exploited in the wild in September 2010,
aka "Print Spooler Service Impersonation Vulnerability."
]],
references = {
'http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2729',
'http://technet.microsoft.com/en-us/security/bulletin/MS10-061',
'http://blogs.technet.com/b/srd/archive/2010/09/14/ms10-061-printer-spooler-vulnerability.aspx'
},
dates = {
disclosure = {year = '2010', month = '09', day = '5'},
},
exploit_results = {},
}
local report = vulns.Report:new(SCRIPT_NAME, host, port)
ms10_061.state = vulns.STATE.NOT_VULN
local status, smbstate
status, smbstate = msrpc.start_smb(host, msrpc.SPOOLSS_PATH,true)
if(status == false) then
stdnse.debug1("SMB: " .. smbstate)
return false, smbstate
end
local bind_result
status, bind_result = msrpc.bind(smbstate,msrpc.SPOOLSS_UUID, msrpc.SPOOLSS_VERSION, nil)
if(status == false) then
msrpc.stop_smb(smbstate)
stdnse.debug1("SMB: " .. bind_result)
return false, bind_result
end
local printer = stdnse.get_script_args(SCRIPT_NAME .. '.printer')
-- if printer not set find available printers
if not printer then
stdnse.debug1("No printer specified, trying to find one...")
local lanman_result
local REMSmb_NetShareEnum_P = "WrLeh"
local REMSmb_share_info_1 = "B13BWz"
status, lanman_result = msrpc.call_lanmanapi(
smbstate, 0, REMSmb_NetShareEnum_P, REMSmb_share_info_1, "\x01\x00\x7e\xff")
if status == false then
stdnse.debug1("SMB: " .. lanman_result)
stdnse.debug1("SMB: Looks like LANMAN API is not available. Try setting printer script arg.")
end
local parameters = lanman_result.parameters
local data = lanman_result.data
local status, convert, entry_count, available_entries = string.unpack("<I2 I2 I2 I2", parameters)
local pos = 1
for i = 1, entry_count, 1 do
local name, share_type = string.unpack(">c14 I2", data, pos)
if share_type == 1 then -- share is printer
name = string.unpack("z", name)
stdnse.debug1("Found printer share %s.", name)
printer = name
break
end
pos = pos + 20
end
end
if not printer then
stdnse.debug1("No printer found, system may be unpatched but it needs at least one printer shared to be vulnerable.")
return false
end
stdnse.debug1("Using %s as printer.",printer)
-- call RpcOpenPrinterEx - opnum 69
local status, result = msrpc.spoolss_open_printer(smbstate,"\\\\"..host.ip.."\\"..printer)
if not status then
return false
end
local printer_handle = string.sub(result.data,25,#result.data-4)
stdnse.debug1("Printer handle %s",stdnse.tohex(printer_handle))
-- call RpcStartDocPrinter - opnum 17
status,result = msrpc.spoolss_start_doc_printer(smbstate,printer_handle,",") -- patched version will allow this
if not status then
return false
end
local print_job_id = string.sub(result.data,25,#result.data-4)
stdnse.debug1("Start doc printer job id %s",stdnse.tohex(print_job_id))
-- call RpcWritePrinter - 19
status, result = msrpc.spoolss_write_printer(smbstate,printer_handle,"aaaa")
if not status then
return false
end
local write_result = string.sub(result.data,25,#result.data-4)
stdnse.debug1("Written %s bytes to a file.",stdnse.tohex(write_result))
if stdnse.tohex(write_result) == "00000000" then -- patched version would report 4 bytes written
ms10_061.state = vulns.STATE.VULN -- identified by diffing patched an unpatched version
end
-- call abort_printer to stop the actual printing in case the remote system is not vulnerable
-- we care about the environment and don't want to spend more paper then needed :)
status,result = msrpc.spoolss_abort_printer(smbstate,printer_handle)
return report:make_output(ms10_061)
end
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