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1. #Endpoint has duplicate windows 10 spooler install#
2. #Endpoint has duplicate windows 10 spooler drivers#
3. #Endpoint has duplicate windows 10 spooler driver#
4. #Endpoint has duplicate windows 10 spooler Patch#
5. #Endpoint has duplicate windows 10 spooler full#

If the spooler is stopped by ANY of those original methods above, then, nothing else is ever going to work. Now that the door is shut, how do we open it for SOME people?

#Endpoint has duplicate windows 10 spooler Patch#

So, the August 10th patch really did close the door for the good guys. Step 2: Final prompt requiring local admin access to proceed Step 1: Find the printer and get initial prompt

#Endpoint has duplicate windows 10 spooler drivers#

Here’s what it looks like (in pictures, not a video) when a user attempts to click to print on a printer (where the drivers have never been installed).

#Endpoint has duplicate windows 10 spooler driver#

Depending on the version of the driver the elevation prompt is not triggering as shown by Benjamin Delphi as seen here MS released CVE-2021-36958 that describes the LPE/RCE Windows Print Spooler Remote Code Execution Vulnerability. Now, there’s a little SIDE NOTE here (Tip of the Hat to Hasain Alshakarti from TRUESEC security The door MAY NOT EVEN BE COMPLETELY SHUT. Users who are used to finding printers by the Click to Print method are simply blocked at showtime. Technically this was already true as standard users could never install, say, local print drivers from some unusual source. You need to be a local admin to do anything Printer-y.

#Endpoint has duplicate windows 10 spooler install#

After installing this update, you must have administrative privileges to install drivers. They release another Patch for Aug 10.Ĭhanges the default privilege requirement for installing drivers when using Point and Print.

Microsoft decides to go nuclear at this problem. run for the hills !ĭateline: Aug 10 - Patch 2 is released (Aka Slam the door shut / no more non-admin access for Print Drivers.) Here’s the original tweet and video: Īck ! Back to Printnightmare and re-shut down all print servers ! OMG. Consequently, the Point and Print Restrictions Group Policy setting can override this to allow non-administrators to be able to install signed and unsigned print drivers to a print server.īut one day later, this was overcome with some example code. Setting the value to 0, or leaving the value undefined, allows non-administrators to install signed and unsigned drivers to a print server but does not override the Point and Print Group Policy settings. From the July patch notes: Īfter putting the July 6th patch everywhere, Microsoft ALSO suggested that you use “Point and print Restrictions” policy setting to force “Show warning and elevation prompt” as follows: The July 6th patch seemed like it would get the problem solved. Now the print spooler services are stopped dead. You can use GPPrefs SERVICES or Powershell scripts or whatever to also do the same thing. (Thanks to Haemish Edgerton for the clarity adjustment here.) Note that after this setting is deployed it requires a reboot of the system or at least a restart of the spooler service. It just prevents sharing printers for OTHER machines. This setting is actually a good mitigation on workstations, which in most cases do not need to share their printers with anyone else. And, moreover, it still works LOCALLY from the machine for local print jobs. This will keep the the print spooler service running, but prevent REMOTE connections to the Print Spooler Service. Use the “Allow Print Spooler to accept client connections” and set to DISABLE. Tip: These are / were PREVIOUS recommendations (applicable if you don’t have patches everywhere:Ĭompletely disable the Print Spooler Service:Įverywhere else because they’re important too. Microsoft’s recommendations which would at least “Shut the door” on possible attacks (BEFORE the July and Aug patches.) Let’s break down each date and method here.īefore July 6: How would you mitigate Printnightmare WITHOUT any patches There’s three dates we have to take into consideration for the discussion: I’m summarizing a little bit, but that’s the gist.Įssentially: you are / were open to attack and have to fix it.

#Endpoint has duplicate windows 10 spooler full#

But the gist is: If the bad guys convinced your users to click on a thing, that would automatically install an “evil driver” which would then give the bad guy full admin access. You can be forgiven for not wanting to go too too deep here. That being said, the original gory details of WHAT the vulnerability is, which include a privilege escalation and remote code execution can be found here:

This tweet (which is a single picture) sums up most admins’ perspective about printers: Printing is something that most admins don’t want to think about.