The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Microsoft Windows MS17-010 SMB Remote Code Execution##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
# auxiliary/scanner/smb/smb_ms_17_010
require 'msf/core'
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::SMB::Client
include Msf::Exploit::Remote::SMB::Client::Authenticated
include Msf::Auxiliary::Scanner
include Msf::Auxiliary::Report
def initialize(info = {})
super(update_info(info,
'Name' => 'MS17-010 SMB RCE Detection',
'Description' => %q{
Uses information disclosure to determine if MS17-010 has been patched or not.
Specifically, it connects to the IPC$ tree and attempts a transaction on FID 0.
If the status returned is "STATUS_INSUFF_SERVER_RESOURCES", the machine does
not have the MS17-010 patch.
This module does not require valid SMB credentials in default server
configurations. It can log on as the user "\" and connect to IPC$.
},
'Author' => [ 'Sean Dillon <[email protected]>' ],
'References' =>
[
[ 'CVE', '2017-0143'],
[ 'CVE', '2017-0144'],
[ 'CVE', '2017-0145'],
[ 'CVE', '2017-0146'],
[ 'CVE', '2017-0147'],
[ 'CVE', '2017-0148'],
[ 'MSB', 'MS17-010'],
[ 'URL', 'https://technet.microsoft.com/en-us/library/security/ms17-010.aspx']
],
'License' => MSF_LICENSE
))
end
def run_host(ip)
begin
status = do_smb_probe(ip)
if status == "STATUS_INSUFF_SERVER_RESOURCES"
print_warning("Host is likely VULNERABLE to MS17-010!")
report_vuln(
host: ip,
name: self.name,
refs: self.references,
info: 'STATUS_INSUFF_SERVER_RESOURCES for FID 0 against IPC$'
)
elsif status == "STATUS_ACCESS_DENIED" or status == "STATUS_INVALID_HANDLE"
# STATUS_ACCESS_DENIED (Windows 10) and STATUS_INVALID_HANDLE (others)
print_good("Host does NOT appear vulnerable.")
else
print_bad("Unable to properly detect if host is vulnerable.")
end
rescue ::Interrupt
print_status("Exiting on interrupt.")
raise $!
rescue ::Rex::Proto::SMB::Exceptions::LoginError
print_error("An SMB Login Error occurred while connecting to the IPC$ tree.")
rescue ::Exception => e
vprint_error("#{e.class}: #{e.message}")
ensure
disconnect
end
end
def do_smb_probe(ip)
connect
# logon as user \
simple.login(datastore['SMBName'], datastore['SMBUser'], datastore['SMBPass'], datastore['SMBDomain'])
# connect to IPC$
ipc_share = "\\\\#{ip}\\IPC$"
simple.connect(ipc_share)
tree_id = simple.shares[ipc_share]
print_status("Connected to #{ipc_share} with TID = #{tree_id}")
# request transaction with fid = 0
pkt = make_smb_trans_ms17_010(tree_id)
sock.put(pkt)
bytes = sock.get_once
# convert packet to response struct
pkt = Rex::Proto::SMB::Constants::SMB_TRANS_RES_HDR_PKT.make_struct
pkt.from_s(bytes[4..-1])
# convert error code to string
code = pkt['SMB'].v['ErrorClass']
smberr = Rex::Proto::SMB::Exceptions::ErrorCode.new
status = smberr.get_error(code)
print_status("Received #{status} with FID = 0")
status
end
def make_smb_trans_ms17_010(tree_id)
# make a raw transaction packet
pkt = Rex::Proto::SMB::Constants::SMB_TRANS_PKT.make_struct
simple.client.smb_defaults(pkt['Payload']['SMB'])
# opcode 0x23 = PeekNamedPipe, fid = 0
setup = "\x23\x00\x00\x00"
setup_count = 2 # 2 words
trans = "\\PIPE\\\x00"
# calculate offsets to the SetupData payload
base_offset = pkt.to_s.length + (setup.length) - 4
param_offset = base_offset + trans.length
data_offset = param_offset # + 0
# packet baselines
pkt['Payload']['SMB'].v['Command'] = Rex::Proto::SMB::Constants::SMB_COM_TRANSACTION
pkt['Payload']['SMB'].v['Flags1'] = 0x18
pkt['Payload']['SMB'].v['Flags2'] = 0x2801 # 0xc803 would unicode
pkt['Payload']['SMB'].v['TreeID'] = tree_id
pkt['Payload']['SMB'].v['WordCount'] = 14 + setup_count
pkt['Payload'].v['ParamCountMax'] = 0xffff
pkt['Payload'].v['DataCountMax'] = 0xffff
pkt['Payload'].v['ParamOffset'] = param_offset
pkt['Payload'].v['DataOffset'] = data_offset
# actual magic: PeekNamedPipe FID=0, \PIPE\
pkt['Payload'].v['SetupCount'] = setup_count
pkt['Payload'].v['SetupData'] = setup
pkt['Payload'].v['Payload'] = trans
pkt.to_s
end
end
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