UPDATED – Critical Patches Issued for Microsoft Products, June 8, 2021

by CIRT Team

11 Jul 2021

in Security Advisories & Alerts

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DESCRIPTION:
Multiple vulnerabilities have been discovered in Microsoft products, the
most severe of which could allow for arbitrary code execution in the
context of the logged-on user. Depending on the privileges associated
with the user, an attacker could then install programs; view, change, or
delete data; or create new accounts with full user rights. Users whose
accounts are configured to have fewer user rights on the system could be
less impacted than those who operate with administrative user rights.

IMPACT:
Researchers have proved that CVE-2021-1675 can be exploited to achieve
remote code execution and proof of concept exploits have since been
leaked. There are reports that the patch for CVE-2021-1675 is not enough
to foil the zero-day PoC available.

SYSTEM AFFECTED:
* .NET Core & Visual Studio
* 3D Viewer
* Microsoft DWM Core Library
* Microsoft Intune
* Microsoft Office
* Microsoft Office Excel
* Microsoft Office Outlook
* Microsoft Office SharePoint
* Microsoft Scripting Engine
* Microsoft Windows Codecs Library
* Paint 3D
* Role: Hyper-V
* Visual Studio Code – Kubernetes Tools
* Windows Bind Filter Driver
* Windows Common Log File System Driver
* Windows Cryptographic Services
* Windows DCOM Server
* Windows Defender
* Windows Drivers
* Windows Event Logging Service
* Windows Filter Manager
* Windows HTML Platform
* Windows Installer
* Windows Kerberos
* Windows Kernel
* Windows Kernel-Mode Drivers
* Windows Network File System
* Windows NTFS
* Windows NTLM
* Windows Print Spooler Components
* Windows Remote Desktop
* Windows TCP/IP

RECOMMENDATIONS:
We recommend the following actions be taken:

* Apply appropriate patches or appropriate mitigations provided by
Microsoft to vulnerable systems immediately after appropriate testing.
* Run all software as a non-privileged user (one without administrative
rights) to diminish the effects of a successful attack.
* Remind all users not to visit untrusted websites or follow links
provided by unknown or untrusted sources.
* Inform and educate users regarding threats posed by hypertext links
contained in emails or attachments especially from untrusted sources.
* Apply the Principle of Least Privilege to all systems and services.
* Disable the “Print Spooler” service on machines that don’t require it.

REFERENCES:
*
https://www.helpnetsecurity.com/2021/06/30/poc-cve-2021-1675/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+HelpNetSecurity+%28Help+Net+Security%29
*
https://www.tenable.com/blog/cve-2021-1675-proof-of-concept-leaked-for-critical-windows-print-spooler-vulnerability
* https://threatpost.com/poc-exploit-windows-print-spooler-bug/167430/
* https://secure-web.cisco.com/1xbhO0he3nqrbTqc1W174bgchCd5lgUfWyTnqYA0j1RGLufTpPnEIwT3xazE300cXWceRHHPR1RFz5oICbJiqdJ7Zn4NvsrJ4viKdLrGtfS7iLmDOyjp3smAc2-a-PKN6n8P5N-WqueYhR78-DOWev-PDcYNQmMIXEiIQMznKXbuvFQPfxWE6r5wkC6uyBD1_B-ZNuXxbzC-gncbeAQMJRJX-1EOYcVxyEBDfi-Pk74rkzTNXgc05ccO2ypASqkvU/https%3A%2F%2Ftwitter.com%2Fwdormann%2Fstatus%2F1410198834970599425
*
https://secure-web.cisco.com/1K1OZ4Z2uYiD3fSkzyATjDldf3kZreR7gn3qe9W2YDLfwxttYuI6kZaFIVB2XtByv4dx9scLEVy2iSNS-3bBmMrLOgUagavB3bXxFTg9Cj7WUXxyNR7fVBcUHELYFUmwo1Usf2zyzhIae4YcuTK10UQhEzsA3wDU-Dc6rmME23qt2NqaUQjSU7DNHbjZsmEreeIC_5–ZOHyfnKa0vYfhBug7gAyM0J4foNZ8It-nsdobGldSOoPBCGKQOCfYsbTZ/https%3A%2F%2Ftwitter.com%2Fhackerfantastic%2Fstatus%2F1410100394492112898%3Fref_src%3Dtwsrc%255Etfw
* https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-1675
*
https://redmondmag.com/articles/2021/06/30/microsoft-print-spool-patch.aspx