Windows users will be pleased to know that Microsoft has released a new patch to secure the PrintNightmare exploit correcting the print spooler remote code execution vulnerability. “A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.”
“UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability.”
Dealing with strings & filenames is hard😉
New function in #mimikatz 🥝to normalize filenames (bypassing checks by using UNC instead of \\server\share format)
So a RCE (and LPE) with #printnightmare on a fully patched server, with Point & Print enabled
— 🥝 Benjamin Delpy (@gentilkiwi) July 7, 2021
“In order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.)”:
NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting)
NoWarningNoElevationOnUpdate = 0 (DWORD) or not defined (default setting)
for more information on correcting the PrintNightmare exploit and installing the correct patch jump over to the official Microsoft website by following the link below.
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