In addition, we will outline the steps to make sure your device remains protected after applying the PrintNightmare patch. In this Windows 10 guide, we will show you the steps to uninstall update KB5004945 or reinstall the print driver if you have problems printing. However, after an investigation regarding the effectiveness of the update, Microsoft claims that the "security update is working as designed and is effective against the known printer spooling exploits and other public reports collectively being referred to as PrintNightmare." The company also recommends that after applying the update to check the Registry to confirm the settings are set 0 (zero) to keep the device secure.
However, at least one security researcher has shown a working exploit on fully patched systems that have Point & Print features enabled, so if you don’t have a Zebra printer you should install the update ASAP.If that wasn't enough, some users seemed to have tried to work around the patch by editing the default print settings using the Registry.
The PrintNightmare issue is serious enough that Microsoft has already delivered patches for all affected versions of Windows that it still supports (Windows 7, 8.1 and several editions of Windows Server in addition to Windows 10). Customers who need assistance regarding Zebra printers may contact our Technical Support Team. Long term, we encourage the use of the newer Windows update Microsoft is planning to release. An immediate way to address the issue is to uninstall the Windows “KB5004945“ update or uninstall the affected printer driver and reinstall using Administrative credentials. Microsoft has investigated this issue and plans to release an update addressing the issue within the next 1–2 business days. We are aware of a printing issue caused by the July 6 Windows “KB5004945“ update affecting multiple brands of printers. In a statement to The Verge, Zebra acknowledged the problem and said Microsoft plans to release an updated patch in the next couple of days that should address the issue. Microsoft has acknowledged the problem as a known issue that can be solved by rolling back the patch or reinstalling the printer as an administrator. In a near-repeat of a problem that occurred this spring with a different Windows 10 security update, system admins discovered that many PCs suddenly couldn’t connect to printers - most notably several models of Zebra label printers - after installing the KB5004945 patch. As if an actively exploited critical flaw in the Windows Print Spooler that can allow someone to take over your computer remotely isn’t bad enough, some people who installed Microsoft’s security patch found out that the connection to their printer stopped working.
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