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local msrpc = require "msrpc"
local smb = require "smb"
local stdnse = require "stdnse"
local vulns = require "vulns"
local rand = require "rand"
description = [[
Detects Microsoft Windows systems with Ras RPC service vulnerable to MS06-025.
MS06-025 targets the <code>RasRpcSumbitRequest()</code> RPC method which is
a part of RASRPC interface that serves as a RPC service for configuring and
getting information from the Remote Access and Routing service. RASRPC can be
accessed using either "\ROUTER" SMB pipe or the "\SRVSVC" SMB pipe (usually on Windows XP machines).
This is in RPC world known as "ncan_np" RPC transport. <code>RasRpcSumbitRequest()</code>
method is a generic method which provides different functionalities according
to the <code>RequestBuffer</code> structure and particularly the <code>RegType</code> field within that
structure. <code>RegType</code> field is of <code>enum ReqTypes</code> type. This enum type lists all
the different available operation that can be performed using the <code>RasRpcSubmitRequest()</code>
RPC method. The one particular operation that this vuln targets is the <code>REQTYPE_GETDEVCONFIG</code>
request to get device information on the RRAS.
This script was previously part of smb-check-vulns.
]]
---
--@usage
-- nmap --script smb-vuln-ms06-025.nse -p445 <host>
-- nmap -sU --script smb-vuln-ms06-025.nse -p U:137,T:139 <host>
--
--@output
--| smb-vuln-ms06-025:
--| VULNERABLE:
--| RRAS Memory Corruption vulnerability (MS06-025)
--| State: VULNERABLE
--| IDs: CVE:CVE-2006-2370
--| A buffer overflow vulnerability in the Routing and Remote Access service (RRAS) in Microsoft Windows 2000 SP4, XP SP1
--| and SP2, and Server 2003 SP1 and earlier allows remote unauthenticated or authenticated attackers to
--| execute arbitrary code via certain crafted "RPC related requests" aka the "RRAS Memory Corruption Vulnerability."
--|
--| Disclosure date: 2006-6-27
--| References:
--| https://technet.microsoft.com/en-us/library/security/ms06-025.aspx
--|_ https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2370
---
author = {"Ron Bowes", "Jiayi Ye", "Paulino Calderon <calderon()websec.mx>"}
copyright = "Ron Bowes"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"intrusive","exploit","dos","vuln"}
-- run after all smb-* scripts (so if it DOES crash something, it doesn't kill
-- other scans have had a chance to run)
dependencies = {
"smb-brute", "smb-enum-sessions", "smb-security-mode",
"smb-enum-shares", "smb-server-stats",
"smb-enum-domains", "smb-enum-users", "smb-system-info",
"smb-enum-groups", "smb-os-discovery", "smb-enum-processes",
"smb-psexec",
};
hostrule = function(host)
return smb.get_port(host) ~= nil
end
local VULNERABLE = 1
local PATCHED = 2
local UNKNOWN = 3
local NOTUP = 8
---Check the existence of ms06_025 vulnerability in Microsoft Remote Routing
--and Access Service. This check is not safe as it crashes the RRAS service and
--its dependencies.
--@param host Host object.
--@return (status, result)
--* <code>status == false</code> -> <code>result == NOTUP</code> which designates
--that the targeted Ras RPC service is not active.
--* <code>status == true</code> ->
-- ** <code>result == VULNERABLE</code> for vulnerable.
-- ** <code>result == PATCHED</code> for not vulnerable.
function check_ms06_025(host)
--create the SMB session
--first we try with the "\router" pipe, then the "\srvsvc" pipe.
local status, smb_result, smbstate, err_msg
status, smb_result = msrpc.start_smb(host, msrpc.ROUTER_PATH)
if(status == false) then
err_msg = smb_result
status, smb_result = msrpc.start_smb(host, msrpc.SRVSVC_PATH) --rras is also accessible across SRVSVC pipe
if(status == false) then
return false, NOTUP --if not accessible across both pipes then service is inactive
end
end
smbstate = smb_result
--bind to RRAS service
local bind_result
status, bind_result = msrpc.bind(smbstate, msrpc.RASRPC_UUID, msrpc.RASRPC_VERSION, nil)
if(status == false) then
msrpc.stop_smb(smbstate)
return false, UNKNOWN --if bind operation results with a false status we can't conclude anything.
end
if(bind_result['ack_result'] == 0x02) then --0x02 == PROVIDER_REJECTION
msrpc.stop_smb(smbstate)
return false, NOTUP --if bind operation results with true but PROVIDER_REJECTION, then the service is inactive.
end
local req, buff, sr_result
req = msrpc.RRAS_marshall_RequestBuffer(
0x01,
msrpc.RRAS_RegTypes['GETDEVCONFIG'],
rand.random_string(3000, "0123456789abcdefghijklmnoprstuvzxwyABCDEFGHIJKLMNOPRSTUVZXWY"))
status, sr_result = msrpc.RRAS_SubmitRequest(smbstate, req)
msrpc.stop_smb(smbstate)
--sanity check
if(status == false) then
stdnse.debug3("check_ms06_025: RRAS_SubmitRequest failed")
if(sr_result == "NT_STATUS_PIPE_BROKEN") then
return true, VULNERABLE
else
return true, PATCHED
end
else
return true, PATCHED
end
end
action = function(host)
local status, result, message
local response = {}
local vuln_report = vulns.Report:new(SCRIPT_NAME, host)
local vuln_table = {
title = 'RRAS Memory Corruption vulnerability (MS06-025)',
state = vulns.STATE.NOT_VULN,
description = [[
A buffer overflow vulnerability in the Routing and Remote Access service (RRAS) in Microsoft Windows 2000 SP4, XP SP1
and SP2, and Server 2003 SP1 and earlier allows remote unauthenticated or authenticated attackers to
execute arbitrary code via certain crafted "RPC related requests" aka the "RRAS Memory Corruption Vulnerability."
]],
IDS = {CVE = 'CVE-2006-2370'},
references = {
'https://technet.microsoft.com/en-us/library/security/ms06-025.aspx'
},
dates = {
disclosure = {year = '2006', month = '6', day = '27'},
}
}
-- Check for ms06-025
status, result = check_ms06_025(host)
if(status == false) then
if(result == NOTUP) then
vuln_table.extra_info = "Ras RPC service is not enabled."
vuln_table.state = vulns.STATE.NOT_VULN
else
vuln_table.state = vulns.STATE.NOT_VULN
end
else
if(result == VULNERABLE) then
vuln_table.state = vulns.STATE.VULN
elseif(result == NOTUP) then
vuln_table.extra_info = "Ras RPC service is not enabled."
vuln_table.state = vulns.STATE.NOT_VULN
else
vuln_table.state = vulns.STATE.NOT_VULN
end
end
return vuln_report:make_output(vuln_table)
end
|
