Microsoft has just released an exceptional update to fix a critical security flaw PrintNightmare that affects the Windows Print Spooler in several versions of Windows, even Windows 7. Here’s a patch to apply urgently.
At the end of June, security researchers from Sangfor Technologies revealed the existence of a critical flaw affecting several versions of Windows including Windows 7. Called PrintNightmare, this vulnerability is located in the print spooler, the system service that puts documents to be printed on hold (see our useful guide How to enable/disable the print spooler service), and allows hackers to easily execute remote code. After having minimized the importance of this breach, stamped CVE-2021-34527, Microsoft has recognized its danger. Especially since the researchers of Sangfor had by mistake published on the Net the test code allowing to exploit this "0-day" flaw and that some people were quick to use it.
To prevent PrintNightmare from doing massive damage, Microsoft had to urgently develop a patch for all affected Windows versions, namely Windows 10 21H1, 20H1, 2004, 1909, 1809, 1803, and even 1507, Windows 8.1, Windows 7 SP1 - although officially abandoned -, Windows Server 2019, 2012, 2008 R2 SP1 and 2008 SP2. And in an exceptional way, the editor did not wait for its traditional monthly patch package - the famous Patch Tuesday - to release it since it is already available via Windows Update.
If you haven't already done so, install the security update for your version of Windows without delay.
Here is the list of updates (KBXXXXX) corresponding to each version of Windows concerned.
Photo – microsoft.com; 123rf.com