mirror of
https://github.com/calebstewart/pwncat.git
synced 2024-11-24 01:25:37 +01:00
72dc93e6f7
`pwncat.victim.privesc` will use the first available and working persistence mechanism to overcome UID!=EUID situations. Also, added more documentation.
108 lines
4.6 KiB
ReStructuredText
108 lines
4.6 KiB
ReStructuredText
Persistence
|
|
===========
|
|
|
|
The ``pwncat.victim.persist`` module provides an abstract way to install various persistence methods
|
|
on the target host. To view a list of available persistence methods, you can use the ``--list/-l``
|
|
switch:
|
|
|
|
.. code-block:: bash
|
|
|
|
(local) pwncat$ persist -l
|
|
- authorized_keys as user (local)
|
|
- pam as system (local)
|
|
- passwd as system (local)
|
|
- sshd as system (local)
|
|
|
|
This output indicates a few things. First, if a given method specifies "as user", then the persistence
|
|
method is installed as a specific user. If no user is specified during installation, ``root`` is
|
|
attempted, but will likely only succeed if you do not currently have root permissions. Second,
|
|
persistence methods marked "local" allow a local user to escalate to that user (or to root for system
|
|
persistence modules). This is in contrast to persistence methods which only allow remote access
|
|
as the specified user.
|
|
|
|
To get more information on a specific module, you can pass the ``--method/-m`` option with the method
|
|
name when using ``--list/-l``. This will provide the module specific documentation on what is being
|
|
installed specifically on the remote system:
|
|
|
|
.. code-block:: bash
|
|
|
|
(local) pwncat$ persist -l -m pam
|
|
pam as system (local)
|
|
|
|
Add a malicious PAM module which will allow authentication as any user.
|
|
This persistence method will install a custom PAM module which authenticates
|
|
every user successfully with your backdoor password. This module also logs
|
|
any passwords in plaintext which are not your backdoor password in /var/log/firstlog.
|
|
The log file is tracked as a separate tamper and will not be automatically removed
|
|
by removing this persistence method.
|
|
|
|
The remote host **must** have `gcc` and `openssl-devel` packages installed
|
|
and you must already have root access.
|
|
|
|
Persistence Installation Status
|
|
-------------------------------
|
|
|
|
To list all currently installed persistence methods, you can use the ``--status/-s`` switch. This
|
|
will list all registered/installed persistence methods known to ``pwncat``. This is also the default
|
|
action if no options are specified.
|
|
|
|
.. code-block:: bash
|
|
|
|
(local) pwncat$ persist -s
|
|
- pam as system (local) installed
|
|
|
|
This is useful because in some situations, the ``pwncat.victim.privesc`` module will automatically
|
|
install persistence. This is normally to overcome a ``EUID != UID`` situation. If this happens,
|
|
``pwncat`` will still track persistence methods correctly.
|
|
|
|
Persistence methods are also tracked by the ``pwncat.victim.tamper`` module. When a persistence
|
|
method is installed, it is registered as both a tamper and a persistence method. In this way, using
|
|
``tamper -r -a`` will remove all of your modifications including persistence methods. If a persistence
|
|
method is removed with tamper, it will also be removed from the persistence status and vice-versa.
|
|
|
|
Installing Persistence
|
|
----------------------
|
|
|
|
The ``persist`` command can be used to install individual persistence methods. The ``--install/-i``
|
|
switch enables this mode. In installation mode, you must specify a module to install with the
|
|
``--method/-m`` option. For user-based methods, you should also specify a user. If no user is specified,
|
|
``pwncat`` will assume you would like root-level persistence. For system methods, the user argument
|
|
is ignored.
|
|
|
|
.. code-block:: bash
|
|
|
|
(local) pwncat$ persist -i -m pam
|
|
[/] pam_sneaky: adding pam auth configuration: login
|
|
(local) pwncat$ persist -i -m authorized_keys -u george
|
|
(local) pwncat$ persist
|
|
- pam as system (local) installed
|
|
- authorized_keys as george (local) installed
|
|
|
|
Removing Persistence
|
|
--------------------
|
|
|
|
Once again, the ``persist`` command is used to remove persistence from the target host. The
|
|
``--remove/-r`` switch is used to enable this mode. You must specify a method with the ``--method/-m``
|
|
option. For user-based methods, you must specify a user to remove the persistence from. As with
|
|
the install, ``pwncat`` will assume you would like to remove the root persistence. If no user is
|
|
specified and persistence as root is not installed, the removal will fail.
|
|
|
|
.. code-block:: bash
|
|
|
|
(local) pwncat$ persist -r -m authorized_keys -u george
|
|
(local) pwncat$ persist -r -m authorized_keys
|
|
[!] authorized_keys as root (local): not installed
|
|
|
|
As mentioned above, persistence installation is also tracked by the tamper command. The ``tamper``
|
|
command can also be used to view and remove persistence methods:
|
|
|
|
.. code-block:: bash
|
|
|
|
(local) pwncat$ tamper
|
|
0 - Created file /var/log/firstlog
|
|
1 - Persistence: pam as system (local)
|
|
(local) pwncat$ tamper -r -t 1
|
|
|
|
|
|
|