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"Windows Printer Related Security Vulnerability"... MS releases urgent updates

"Windows Printer Related Security Vulnerability"... MS releases urgent updates
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Print Nightmare , Window Print Spooler , Windows Server , ஜன்னல்கள் சேவையகம் ,

How to Avoid Windows' 'PrintNightmare' Security Threat


Filed to:computer printing
Photo: Diego Cervo, Shutterstock
Microsoft warns of a potentially major zero-day security flaw in Windows’ Print Spooler code. While Microsoft has not identified the severity of the vulnerability dubbed “PrintNightmare” it sounds pretty bad.
The company says outside users could exploit PrintNightmare to gain elevated administrator privileges and execute code remotely. In other words, it’s an open invitation for hackers to gain control of a PC and install malware, ransomware, steal or destroy important data, and more, without requiring physical access to the computer. Y’know, real black hat stuff.
PrintNightmare affects the Windows Print Spooler in all versions of Windows, including the versions installed on personal computers, enterprise networks, Windows Servers, and Domain Controllers. Worse, PrintSpooler is already being actively exploited by hackers due to a fumbled proof-of-concept (PoC) attack. ....

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PrintNightmare: Kicking users from Pre-Windows 2000 legacy group may thwart domain controller exploitation


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Another potential mitigation has emerged for the PrintNightmare zero-day vuln, which lets low-privileged users execute code as SYSTEM on Windows domain controllers: remove those people from a backwards-compatibility group.
The zero-day hole came to light earlier this week after an infosec research firm mistakenly published proof-of-concept exploit code for a remote-code execution (RCE) vuln it had nicknamed PrintNightmare. Sangfor Technologies published the exploit for the vulnerability after wrongly believing Microsoft had patched it this month, having read the June Patch Tuesday notes for a remote-code execution vuln in Windows Print Spooler tracked as CVE-2021-1675.
While the patch for CVE-2021-1675 also protects against PrintNightmare on most Windows devices, it didn’t do so for domain controllers, which caused some puzzlement among security researchers. Until today, when Yunhai Zhang of Tianji Lab discovered a potential cause: ....

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