PrintNightmare has been the topic of the month. ⚡ TL DR | Go Straight to the July 2021 Patch Tuesday Audit Report CVE-2021-34527 - PrintNightmare We've listed the most important changes below and listed all of the fixes included. The Patch Tuesday, July 2021 brings us 117 fixes, 15 of which are rated as critical including a highly critical Microsoft Sharepoint Server RCE vulnerability. The researcher implemented the exploit in Mimikatz.Patch Tuesday is once again upon us. Wednesday’s demo from Delpy shows that PrintNightmare works against a much wider range of systems, including those that have enabled a Point and Print and selected the NoWarningNoElevationOnInstall option. Microsoft’s fix protects Windows servers that are set up as domain controllers or Windows 10 devices that use default settings. There are currently at least three proof-of-concept exploits publicly available, some with capabilities that go well beyond what the initial exploit allowed.

Zhiniang Peng and Xuefeng Li removed their proof-of-concept exploit when they learned of the confusion, but by then their exploit was already widely circulating. The researchers named their exploit PrintNightmare.Įventually, researchers determined that PrintNightmare exploited a vulnerability that was similar (but ultimately different from) CVE-2021-1675.

Microsoft credited Zhipeng Huo of Tencent Security, Piotr Madej of Afine, and Yunhai Zhang of Nsfocus with discovering and reporting the flaw.Ī few weeks later, two different researchers-Zhiniang Peng and Xuefeng Li from Sangfor-published an analysis of CVE-2021-1675 that showed it could be exploited not just for privilege escalation but also for achieving remote code execution. Last month, Microsoft’s monthly patch batch fixed CVE-2021-1675, a print spooler bug that allowed hackers with limited system rights on a machine to escalate privilege to administrator.

The incomplete patch is the latest gaffe involving the PrintNightmare vulnerability.

Buried near the bottom of Microsoft's advisory from Tuesday is the following: 'Point and Print is not directly related to this vulnerability, but the technology weakens the local security posture in such a way that exploitation will be possible.'

Lansweeper printnightmare