The PrintNightmare bug has been reported by researchers at Chinese cyber security firm Sengfor Technologies. It can be used with system privileges to run arbitrary malicious code.
PrintNightmare bug has been reported by Chinese cyber security firm. (signal picture)
Microsoft has released security updates for Windows users to address security bugs affecting the Windows Print Spooler service. The bug called “PrintNightmare”, which was discovered last week, allows hackers to remotely access malicious code with systems, install a program, change existing programs, and create new accounts with full access. is.
Microsoft has come up with emergency patches for all major Windows versions- Windows 7 to Windows 10. Windows Server users have also been provided with special security updates to fix this particular bug. Windows Server 2004, Windows Server 2008, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows 7, Windows RT 8.1, Windows Server 2004, Windows Server 2008, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows 8.1, and Windows 10 included.
Microsoft said the update includes security for the issue, which is recorded as CVE-2021-34527. Since the Windows Print Spooler service is present on all Windows versions, the bug has affected all Windows machines. However, the security update list is currently limited to a few versions. Microsoft has said that it will soon update the remaining versions of Windows.
How to Disable Print Spooler
In the meantime, users on Windows machines are yet to receive a security fix, they are recommended to manually disable the print spooler service or disable inbound remote printing. The print spooler can be disabled by passing the commands “Stop-Service -Name Spooler -Force” and “Set-Service -Name Spooler -StartupType Disabled” through PowerShell.
On the other hand, inbound remote printing can be disabled by going to Computer Configuration > Administrative Templates > Printers and turning off Allow Print Spooler to accept client connections. You need to restart the Print Spooler service for the change to take effect.
The PrintNightmare bug was reported last week by researchers at Chinese cyber security firm Sengfor Technologies. This is known as remote code execution bug which can be used to run arbitrary malicious code with system privileges. Microsoft explained that the bug occurs when the Windows Print Spooler service improperly operates a privileged file.
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