krbrelayx: Kerberos unconstrained delegation abuse toolkit

Krbrelayx – Unconstrained delegation abuse toolkit

Toolkit for abusing unconstrained delegation. Requires impacket and ldap3 to function. It is recommended to install impacket from git directly to have the latest version available.

Download

git clone https://github.com/dirkjanm/krbrelayx.git

Tools included

addspn.py

This tool can add/remove/modify Service Principal Names on accounts in AD over LDAP.

usage: addspn.py [-h] [-u USERNAME] [-p PASSWORD] [-t TARGET] -s SPN [-r] [-q]

[-a]
HOSTNAME

Add an SPN to a user/computer account

Required options:
HOSTNAME Hostname/ip or ldap://host:port connection string to
connect to

Main options:
-h, --help show this help message and exit
-u USERNAME, --user USERNAME
DOMAIN\username for authentication
-p PASSWORD, --password PASSWORD
Password or LM:NTLM hash, will prompt if not specified
-t TARGET, --target TARGET
Computername or username to target (FQDN or COMPUTER$
name, if unspecified user with -u is target)
-s SPN, --spn SPN servicePrincipalName to add (for example:
http/host.domain.local or cifs/host.domain.local)
-r, --remove Remove the SPN instead of add it
-q, --query Show the current target SPNs instead of modifying
anything
-a, --additional Add the SPN via the msDS-AdditionalDnsHostName
attribute

 

dnstool.py

Add/modify/delete Active Directory Integrated DNS records via LDAP.

usage: dnstool.py [-h] [-u USERNAME] [-p PASSWORD] [--forest] [--zone ZONE]

[--print-zones] [-r TARGETRECORD]
[-a {add,modify,query,remove,ldapdelete}] [-t {A}]
[-d RECORDDATA] [--allow-multiple] [--ttl TTL]
HOSTNAME

Query/modify DNS records for Active Directory integrated DNS via LDAP

Required options:
HOSTNAME Hostname/ip or ldap://host:port connection string to
connect to

Main options:
-h, --help show this help message and exit
-u USERNAME, --user USERNAME
DOMAIN\username for authentication.
-p PASSWORD, --password PASSWORD
Password or LM:NTLM hash, will prompt if not specified
--forest Search the ForestDnsZones instead of DomainDnsZones
--zone ZONE Zone to search in (if different than the current
domain)
--print-zones Only query all zones on the DNS server, no other
modifications are made

Record options:
-r TARGETRECORD, --record TARGETRECORD
Record to target (FQDN)
-a {add,modify,query,remove,ldapdelete}, --action {add,modify,query,remove,ldapdelete}
Action to perform. Options: add (add a new record),
modify (modify an existing record), query (show
existing), remove (mark record for cleanup from DNS
cache), delete (delete from LDAP). Default: query
-t {A}, --type {A} Record type to add (Currently only A records
supported)
-d RECORDDATA, --data RECORDDATA
Record data (IP address)
--allow-multiple Allow multiple A records for the same name
--ttl TTL TTL for record (default: 180)

 

printerbug.py

Simple tool to trigger SpoolService bug via RPC backconnect. Similar to dementor.py. Thanks to @agsolino for implementing these RPC calls.

usage: printerbug.py [-h] [-target-file file] [-port [destination port]]

[-hashes LMHASH:NTHASH] [-no-pass]
target attackerhost

positional arguments:
target [[domain/]username[:password]@]<targetName or address>
attackerhost hostname to connect to

optional arguments:
-h, --help show this help message and exit

connection:
-target-file file Use the targets in the specified file instead of the
one on the command line (you must still specify
something as target name)
-port [destination port]
Destination port to connect to SMB Server

authentication:
-hashes LMHASH:NTHASH
NTLM hashes, format is LMHASH:NTHASH
-no-pass don't ask for password (useful when proxying through
ntlmrelayx)

 

krbrelayx.py

Given an account with unconstrained delegation privileges, dump Kerberos TGT’s of users connecting to hosts similar to ntlmrelayx.

usage: krbrelayx.py [-h] [-debug] [-t TARGET] [-tf TARGETSFILE] [-w]

[-ip INTERFACE_IP] [-r SMBSERVER] [-l LOOTDIR]
[-f {ccache,kirbi}] [-codec CODEC] [-no-smb2support]
[-wh WPAD_HOST] [-wa WPAD_AUTH_NUM] [-6] [-p PASSWORD]
[-hp HEXPASSWORD] [-s USERNAME] [-hashes LMHASH:NTHASH]
[-aesKey hex key] [-dc-ip ip address] [-e FILE]
[-c COMMAND] [--enum-local-admins] [--no-dump] [--no-da]
[--no-acl] [--no-validate-privs]
[--escalate-user ESCALATE_USER]

Kerberos "relay" tool. Abuses accounts with unconstrained delegation to pwn
things.

Main options:
-h, --help show this help message and exit
-debug Turn DEBUG output ON
-t TARGET, --target TARGET
Target to attack, since this is Kerberos, only
HOSTNAMES are valid. Example: smb://server:445 If
unspecified, will store tickets for later use.
-tf TARGETSFILE File that contains targets by hostname or full URL,
one per line
-w Watch the target file for changes and update target
list automatically (only valid with -tf)
-ip INTERFACE_IP, --interface-ip INTERFACE_IP
IP address of interface to bind SMB and HTTP servers
-r SMBSERVER Redirect HTTP requests to a file:// path on SMBSERVER
-l LOOTDIR, --lootdir LOOTDIR
Loot directory in which gathered loot (TGTs or dumps)
will be stored (default: current directory).
-f {ccache,kirbi}, --format {ccache,kirbi}
Format to store tickets in. Valid: ccache (Impacket)
or kirbi (Mimikatz format) default: ccache
-codec CODEC Sets encoding used (codec) from the target's output
(default "ascii"). If errors are detected, run
chcp.com at the target, map the result with
https://docs.python.org/2.4/lib/standard-
encodings.html and then execute ntlmrelayx.py again
with -codec and the corresponding codec
-no-smb2support Disable SMB2 Support
-wh WPAD_HOST, --wpad-host WPAD_HOST
Enable serving a WPAD file for Proxy Authentication
attack, setting the proxy host to the one supplied.
-wa WPAD_AUTH_NUM, --wpad-auth-num WPAD_AUTH_NUM
Prompt for authentication N times for clients without
MS16-077 installed before serving a WPAD file.
-6, --ipv6 Listen on both IPv6 and IPv4

Kerberos Keys (of your account with unconstrained delegation):
-p PASSWORD, --krbpass PASSWORD
Account password
-hp HEXPASSWORD, --krbhexpass HEXPASSWORD
Hex-encoded password
-s USERNAME, --krbsalt USERNAME
Case sensitive (!) salt. Used to calculate Kerberos
keys.Only required if specifying password instead of
keys.
-hashes LMHASH:NTHASH
NTLM hashes, format is LMHASH:NTHASH
-aesKey hex key AES key to use for Kerberos Authentication (128 or 256
bits)
-dc-ip ip address IP Address of the domain controller. If ommited it use
the domain part (FQDN) specified in the target
parameter

SMB attack options:
-e FILE File to execute on the target system. If not
specified, hashes will be dumped (secretsdump.py must
be in the same directory)
-c COMMAND Command to execute on target system. If not specified,
hashes will be dumped (secretsdump.py must be in the
same directory).
--enum-local-admins If relayed user is not admin, attempt SAMR lookup to
see who is (only works pre Win 10 Anniversary)

LDAP attack options:
--no-dump Do not attempt to dump LDAP information
--no-da Do not attempt to add a Domain Admin
--no-acl Disable ACL attacks
--no-validate-privs Do not attempt to enumerate privileges, assume
permissions are granted to escalate a user via ACL
attacks
--escalate-user ESCALATE_USER
Escalate privileges of this user instead of creating a
new one

More info about this toolkit available in my blog

Copyright (c) 2019 Dirk-jan Mollema (@_dirkjan)

Source: https://github.com/dirkjanm/