Module auxiliary/gather/kerberos_enumusers errors when enumerating users with no preauthentication required

[stephenbradshaw]

Steps to reproduce

The auxiliary/gather/kerberos_enumusers module errors out when attempting to enumerate a Kerberos user with the “No Kerberos Pre-Authentication Required” option set.

Target server is Windows Server 2019 Datacenter 10.0 (17763).

See the example below, in this case the file /tmp/users.txt contains 3 users that exist in the system, the third of which has the “No Kerberos Pre-Authentication Required” option set.

msf6 exploit(windows/smb/psexec) > use auxiliary/gather/kerberos_enumusers
msf6 auxiliary(gather/kerberos_enumusers) > set DOMAIN *REDACTED*
DOMAIN => *REDACTED*
msf6 auxiliary(gather/kerberos_enumusers) > set RHOSTS *REDACTED*
RHOSTS => *REDACTED*
msf6 auxiliary(gather/kerberos_enumusers) > set USER_FILE /tmp/users.txt
USER_FILE => /tmp/users.txt
msf6 auxiliary(gather/kerberos_enumusers) > exploit
[*] Running module against *REDACTED*

[*] Validating options...
[*] Using domain: *REDACTED*...
[*] *REDACTED*:88 - Testing User: "administrator"...
[*] *REDACTED*:88 - KDC_ERR_PREAUTH_REQUIRED - Additional pre-authentication required
[+] *REDACTED*:88 - User: "administrator" is present
[*] *REDACTED*:88 - Testing User: "guest"...
[*] *REDACTED*:88 - KDC_ERR_CLIENT_REVOKED - Clients credentials have been revoked
[-] *REDACTED*:88 - User: "guest" account disabled or locked out
[*] *REDACTED*:88 - Testing User: "*REDACTED*"...
[-] Auxiliary failed: NoMethodError undefined method `error_code' for #<Rex::Proto::Kerberos::Model::KdcResponse:0x00007f7fa695ca18>
[-] Call stack:
[-]   /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:74:in `block in run'
[-]   /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `each'
[-]   /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `run'
[*] Auxiliary module execution completed

Expected behavior

The existing user should be identified, no error should occur.

Current behavior

The error shown above occurs.

Metasploit version

5fe585d (HEAD -> master, origin/master, origin/HEAD) automatic module_metadata_base.json update

Additional Information

##  Module/Datastore

The following global/module datastore, and database setup was configured before the issue occurred:
<details>
<summary>Collapse</summary>

```
[framework/ui/console]
ActiveModule=auxiliary/gather/kerberos_enumusers

[gather/kerberos_enumusers]
WORKSPACE=
VERBOSE=false
RHOSTS=*REDACTED*
RPORT=88
Timeout=10
DOMAIN=*REDACTED*
USER_FILE=/tmp/users.txt
loglevel=3
```

</details>


##  History

The following commands were ran during the session and before this issue occurred:
<details>
<summary>Collapse</summary>

```
2011   use auxiliary/gather/kerberos_enumusers
2012   set loglevel 3
2013   set DOMAIN *REDACTED*
2014   options
2015   set RHOSTS *REDACTED*
2018   set USER_FILE /tmp/users.txt
2019   exploit
2020   debug
```

</details>


##  Framework Errors

The following framework errors occurred before the issue occurred:
<details>
<summary>Collapse</summary>

```
[06/02/2021 11:52:10] [e(0)] core: Failed to connect to the database: No database YAML file
[06/02/2021 11:53:51] [e(0)] core: Thread Exception: StreamMonitorRemote  critical=false    source:
    /opt/metasploit-framework/lib/metasploit/framework/thread_factory_provider.rb:25:in `spawn'
    /opt/metasploit-framework/lib/rex/thread_factory.rb:22:in `spawn'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/socket_abstraction.rb:120:in `monitor_rsock'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/stream_abstraction.rb:30:in `initialize_abstraction'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channels/socket_abstraction.rb:93:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:73:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `new'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `create'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:36:in `open'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:124:in `create_tcp_client_channel'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:93:in `create'
    /opt/metasploit-framework/lib/msf/base/sessions/meterpreter.rb:577:in `create'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket.rb:51:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:37:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:28:in `create'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/tcp.rb:105:in `connect'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/smb/client.rb:106:in `connect'
    /opt/metasploit-framework/modules/exploits/windows/smb/psexec.rb:147:in `exploit'
    /opt/metasploit-framework/lib/msf/core/exploit_driver.rb:215:in `job_run_proc'
    /opt/metasploit-framework/lib/msf/core/exploit_driver.rb:168:in `run'
    /opt/metasploit-framework/lib/msf/base/simple/exploit.rb:144:in `exploit_simple'
    /opt/metasploit-framework/lib/msf/base/simple/exploit.rb:168:in `exploit_simple'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/exploit.rb:56:in `exploit_single'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/exploit.rb:213:in `cmd_exploit'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - TypeError no implicit conversion of nil into Integer
[06/02/2021 11:53:55] [e(0)] core: Session with no session_host/target_host/tunnel_peer. Session Info: #<Session:meterpreter 127.0.0.1 () >
[06/02/2021 11:55:55] [e(0)] core: Thread Exception: StreamMonitorRemote  critical=false    source:
    /opt/metasploit-framework/lib/metasploit/framework/thread_factory_provider.rb:25:in `spawn'
    /opt/metasploit-framework/lib/rex/thread_factory.rb:22:in `spawn'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/socket_abstraction.rb:120:in `monitor_rsock'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/stream_abstraction.rb:30:in `initialize_abstraction'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channels/socket_abstraction.rb:93:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:73:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `new'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `create'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:36:in `open'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:124:in `create_tcp_client_channel'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:93:in `create'
    /opt/metasploit-framework/lib/msf/base/sessions/meterpreter.rb:577:in `create'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket.rb:51:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:37:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:28:in `create'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:131:in `create_tcp_connection'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:45:in `connect'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:72:in `send_request'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:119:in `send_recv'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/kerberos/client.rb:112:in `send_request_as'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:67:in `block in run'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `each'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `run'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:178:in `job_run_proc'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:85:in `run_simple'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:96:in `run_simple'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:80:in `block in cmd_run'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/range_walker.rb:232:in `each_host'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:75:in `cmd_run'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - Rex::Post::Meterpreter::RequestError stdapi_net_socket_tcp_shutdown: Operation failed: The handle is invalid.
[06/02/2021 11:55:57] [e(0)] core: Auxiliary failed - NoMethodError undefined method `error_code' for #<Rex::Proto::Kerberos::Model::KdcResponse:0x00007f7fa695ca18>
[06/02/2021 12:04:23] [e(0)] core: Failed to connect to the database: No database YAML file
[06/02/2021 12:07:39] [e(0)] core: Thread Exception: StreamMonitorRemote  critical=false    source:
    /opt/metasploit-framework/lib/metasploit/framework/thread_factory_provider.rb:25:in `spawn'
    /opt/metasploit-framework/lib/rex/thread_factory.rb:22:in `spawn'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/socket_abstraction.rb:120:in `monitor_rsock'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/stream_abstraction.rb:30:in `initialize_abstraction'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channels/socket_abstraction.rb:93:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:73:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `new'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `create'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:36:in `open'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:124:in `create_tcp_client_channel'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:93:in `create'
    /opt/metasploit-framework/lib/msf/base/sessions/meterpreter.rb:577:in `create'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket.rb:51:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:37:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:28:in `create'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/tcp.rb:105:in `connect'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/smb/client.rb:106:in `connect'
    /opt/metasploit-framework/modules/exploits/windows/smb/psexec.rb:147:in `exploit'
    /opt/metasploit-framework/lib/msf/core/exploit_driver.rb:215:in `job_run_proc'
    /opt/metasploit-framework/lib/msf/core/exploit_driver.rb:168:in `run'
    /opt/metasploit-framework/lib/msf/base/simple/exploit.rb:144:in `exploit_simple'
    /opt/metasploit-framework/lib/msf/base/simple/exploit.rb:168:in `exploit_simple'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/exploit.rb:56:in `exploit_single'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/exploit.rb:213:in `cmd_exploit'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - Rex::Post::Meterpreter::RequestError stdapi_net_socket_tcp_shutdown: Operation failed: 1
[06/02/2021 12:09:08] [e(0)] core: Thread Exception: StreamMonitorRemote  critical=false    source:
    /opt/metasploit-framework/lib/metasploit/framework/thread_factory_provider.rb:25:in `spawn'
    /opt/metasploit-framework/lib/rex/thread_factory.rb:22:in `spawn'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/socket_abstraction.rb:120:in `monitor_rsock'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/stream_abstraction.rb:30:in `initialize_abstraction'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channels/socket_abstraction.rb:93:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:73:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `new'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `create'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:36:in `open'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:124:in `create_tcp_client_channel'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:93:in `create'
    /opt/metasploit-framework/lib/msf/base/sessions/meterpreter.rb:577:in `create'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket.rb:51:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:37:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:28:in `create'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:131:in `create_tcp_connection'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:45:in `connect'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:72:in `send_request'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:119:in `send_recv'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/kerberos/client.rb:112:in `send_request_as'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:67:in `block in run'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `each'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `run'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:178:in `job_run_proc'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:85:in `run_simple'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:96:in `run_simple'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:80:in `block in cmd_run'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/range_walker.rb:232:in `each_host'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:75:in `cmd_run'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - Rex::Post::Meterpreter::RequestError stdapi_net_socket_tcp_shutdown: Operation failed: The handle is invalid.
[06/02/2021 12:09:09] [e(0)] core: Thread Exception: StreamMonitorRemote  critical=false    source:
    /opt/metasploit-framework/lib/metasploit/framework/thread_factory_provider.rb:25:in `spawn'
    /opt/metasploit-framework/lib/rex/thread_factory.rb:22:in `spawn'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/socket_abstraction.rb:120:in `monitor_rsock'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/stream_abstraction.rb:30:in `initialize_abstraction'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channels/socket_abstraction.rb:93:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:73:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `new'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `create'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:36:in `open'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:124:in `create_tcp_client_channel'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:93:in `create'
    /opt/metasploit-framework/lib/msf/base/sessions/meterpreter.rb:577:in `create'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket.rb:51:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:37:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:28:in `create'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:131:in `create_tcp_connection'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:45:in `connect'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:72:in `send_request'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:119:in `send_recv'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/kerberos/client.rb:112:in `send_request_as'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:67:in `block in run'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `each'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `run'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:178:in `job_run_proc'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:85:in `run_simple'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:96:in `run_simple'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:80:in `block in cmd_run'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/range_walker.rb:232:in `each_host'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:75:in `cmd_run'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - Rex::Post::Meterpreter::RequestError stdapi_net_socket_tcp_shutdown: Operation failed: The handle is invalid.
[06/02/2021 12:09:10] [e(0)] core: Auxiliary failed - NoMethodError undefined method `error_code' for #<Rex::Proto::Kerberos::Model::KdcResponse:0x00007f926f90c0a0>
```

</details>


##  Web Service Errors

The following web service errors occurred before the issue occurred:
<details>
<summary>Collapse</summary>

```
msf-ws.log does not exist.
```

</details>


##  Framework Logs

The following framework logs were recorded before the issue occurred:
<details>
<summary>Collapse</summary>

```
/opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:75:in `cmd_run'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - Rex::Post::Meterpreter::RequestError stdapi_net_socket_tcp_shutdown: Operation failed: The handle is invalid.
[06/02/2021 12:09:08] [w(0)] core: monitor_rsock: exception during select: Rex::StreamClosedError Stream #<TCPSocket:0x00007f92c9f12580> is closed.
[06/02/2021 12:09:09] [e(0)] core: Thread Exception: StreamMonitorRemote  critical=false    source:
    /opt/metasploit-framework/lib/metasploit/framework/thread_factory_provider.rb:25:in `spawn'
    /opt/metasploit-framework/lib/rex/thread_factory.rb:22:in `spawn'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/socket_abstraction.rb:120:in `monitor_rsock'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-core-0.1.16/lib/rex/io/stream_abstraction.rb:30:in `initialize_abstraction'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channels/socket_abstraction.rb:93:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:73:in `initialize'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `new'
    /opt/metasploit-framework/lib/rex/post/meterpreter/channel.rb:124:in `create'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket_subsystem/tcp_client_channel.rb:36:in `open'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:124:in `create_tcp_client_channel'
    /opt/metasploit-framework/lib/rex/post/meterpreter/extensions/stdapi/net/socket.rb:93:in `create'
    /opt/metasploit-framework/lib/msf/base/sessions/meterpreter.rb:577:in `create'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket.rb:51:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:37:in `create_param'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/tcp.rb:28:in `create'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:131:in `create_tcp_connection'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:45:in `connect'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:72:in `send_request'
    /opt/metasploit-framework/lib/rex/proto/kerberos/client.rb:119:in `send_recv'
    /opt/metasploit-framework/lib/msf/core/exploit/remote/kerberos/client.rb:112:in `send_request_as'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:67:in `block in run'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `each'
    /opt/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `run'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:178:in `job_run_proc'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:85:in `run_simple'
    /opt/metasploit-framework/lib/msf/base/simple/auxiliary.rb:96:in `run_simple'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:80:in `block in cmd_run'
    /opt/local/lib/ruby2.7/gems/2.7.0/gems/rex-socket-0.1.29/lib/rex/socket/range_walker.rb:232:in `each_host'
    /opt/metasploit-framework/lib/msf/ui/console/command_dispatcher/auxiliary.rb:75:in `cmd_run'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:532:in `run_command'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:481:in `block in run_single'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `each'
    /opt/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:475:in `run_single'
    /opt/metasploit-framework/lib/rex/ui/text/shell.rb:155:in `run'
    /opt/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
    /opt/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
    ./msfconsole:23:in `<main>' - Rex::Post::Meterpreter::RequestError stdapi_net_socket_tcp_shutdown: Operation failed: The handle is invalid.
[06/02/2021 12:09:10] [w(0)] core: monitor_rsock: exception during select: Rex::StreamClosedError Stream #<TCPSocket:0x00007f926f94dde8> is closed.
[06/02/2021 12:09:10] [e(0)] core: Auxiliary failed - NoMethodError undefined method `error_code' for #<Rex::Proto::Kerberos::Model::KdcResponse:0x00007f926f90c0a0>
```

</details>


##  Web Service Logs

The following web service logs were recorded before the issue occurred:
<details>
<summary>Collapse</summary>

```
msf-ws.log does not exist.
```

</details>


##  Version/Install

The versions and install method of your Metasploit setup:
<details>
<summary>Collapse</summary>

```
Framework: 6.0.47-dev-5fe585df79
Ruby: ruby 2.7.3p183 (2021-04-05 revision 6847ee089d) [x86_64-darwin19]
Install Root: /opt/metasploit-framework
Session Type: postgresql selected, no connection
Install Method: Git Clone
```

</details>

[github-actions]

Hi!

This issue has been left open with no activity for a while now.

We get a lot of issues, so we currently close issues after 60 days of inactivity. It’s been at least 30 days since the last update here.
If we missed this issue or if you want to keep it open, please reply here. You can also add the label "not stale" to keep this issue open!

As a friendly reminder: the best way to see this issue, or any other, fixed is to open a Pull Request.

[stephenbradshaw]

Please keep this open, issue not resolved.

[github-actions]

Hi!

This issue has been left open with no activity for a while now.

We get a lot of issues, so we currently close issues after 60 days of inactivity. It’s been at least 30 days since the last update here.
If we missed this issue or if you want to keep it open, please reply here. You can also add the label "not stale" to keep this issue open!

As a friendly reminder: the best way to see this issue, or any other, fixed is to open a Pull Request.

[stephenbradshaw]

Please keep open, I will look to do a PR to resolve

[github-actions]

Hi!

This issue has been left open with no activity for a while now.

We get a lot of issues, so we currently close issues after 60 days of inactivity. It’s been at least 30 days since the last update here.
If we missed this issue or if you want to keep it open, please reply here. You can also add the label "not stale" to keep this issue open!

As a friendly reminder: the best way to see this issue, or any other, fixed is to open a Pull Request.

[stephenbradshaw]

Am still intending to add a PR for this at some point

[adfoster-r7]

Confirmed 👍

This raises an issue when kerberos replies with an ASREP response:

[*] 192.168.123.13:88 - Testing User: "no_kerberos_preauth"...
[-] Auxiliary failed: NoMethodError undefined method `error_code' for #<Rex::Proto::Kerberos::Model::KdcResponse:0x00007fe861a76e48>
[-] Call stack:
[-]   /Users/user/Documents/code/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:74:in `block in run'
[-]   /Users/user/Documents/code/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `each'
[-]   /Users/user/Documents/code/metasploit-framework/modules/auxiliary/gather/kerberos_enumusers.rb:65:in `run'
[*] Auxiliary module execution completed

Relevant response parsing logic:

metasploit-framework/lib/rex/proto/kerberos/client.rb

Lines 193 to 209 in a481986

	def decode_kerb_response(data)
	asn1 = OpenSSL::ASN1.decode(data)
	msg_type = asn1.value[0].value[1].value[0].value
	case msg_type
	when Rex::Proto::Kerberos::Model::KRB_ERROR
	res = Rex::Proto::Kerberos::Model::KrbError.decode(asn1)
	when Rex::Proto::Kerberos::Model::AS_REP
	res = Rex::Proto::Kerberos::Model::KdcResponse.decode(asn1)
	when Rex::Proto::Kerberos::Model::TGS_REP
	res = Rex::Proto::Kerberos::Model::KdcResponse.decode(asn1)
	else
	raise ::RuntimeError, 'Kerberos Client: Unknown response'
	end
	res
	end

Feel free to request my review @stephenbradshaw when you get a PR up :)