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CVE-2021-1675 was addressed by the June 2021 security update.” This vulnerability is similar but distinct from the vulnerability that is assigned CVE-2021-1675, which addresses a different vulnerability in RpcAddPrinterDriverEx().
We are still investigating if other types of roles are also affected. An attack must involve an authenticated user calling RpcAddPrinterDriverEx(),” Microsoft explained.
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An attacker could then install programs view, change, or delete data or create new accounts with full user rights.
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An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges.
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“A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. Microsoft has assigned a new CVE to this so-called PrintNightmare vulnerability: CVE-2021-34527. Stop and Disable the service on any DC now! /s4yE2VVl5I If you have the "Print Spooler" service enabled (which is the default), any remote authenticated user can execute code as SYSTEM on the domain controller. Until Microsoft clears up the confusion and releases another patch, disabling the “Print Spooler” service on machines that don’t need it is a good idea. Disable "Print Spooler" service on servers that do not require it.
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So, for those organizations that haven’t yet implemented the available patch, time is now of the essence.Īpparently, the patch for CVE-2021-1675 released earlier this month might not be enough to foil the zero-day PoC (“PrintNightmare”) available:įully patched Windows 2019 domain controller, popped with 0day exploit (CVE-2021-1675) from a regular Domain User's account giving full SYSTEM privileges. In fact, forks and specific implementations can already be found online. Occasionally, threat actors do it, too: the attackers behind the infamous Stuxnet malware leveraged, among other bugs, a “lowly” privilege escalation vulnerability in the Windows Print Spooler service.Ĭopied and modified PoC exploits for CVE-2021-1675 will be widely available soon. It is an old Windows component (20+ years) and researchers find bugs in it often.
The Windows Print Spooler is an application / interface / service that interacts with local or networked printers and manages the printing process.
Two days later, researchers from Sangfor Technologies published and then quickly deleted technical details and a PoC exploit for CVE-2021-1675, but not before the GitHub repository where they put it was cloned / forked. Then, on June 27, the researchers from Chinese cybersecurity company QiAnXin shared on Twitter a video/GIF demonstrating an exploit for the vulnerability to achieve RCE. CVE-2021-1675, a Windows Print Spooler vulnerability that Microsoft patched in June 2021, presents a much greater danger than initially thought: researchers have proved that it can be exploited to achieve remote code execution and – what’s worse – PoC exploits have since been leaked.Ĭredited to Zhipeng Huo of Tencent Security Xuanwu Lab, Piotr Madej of AFINE and Yunhai Zhang of NSFOCUS TIANJI Lab, CVE-2021-1675 was initially classed as low severity vulnerability, allowing local privilege elevation, and was patched on June 2021 Patch Tuesday.īut on June 21, 2021, Microsoft changed the classification because it was discovered that the flaw allows for remote code execution (RCE), and it was re-classified as critical.