Advisory Details

December 21st, 2021

Microsoft Windows Print Spooler Link Following Privilege Escalation Vulnerability

ZDI-21-1552
ZDI-CAN-14459

CVE ID CVE-2021-41333
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to escape the low integrity sandbox on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the Print Spooler service. The service can be abused to create an arbitrary file. An attacker can leverage this vulnerability to execute code in the context of the current user at medium integrity.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41333
DISCLOSURE TIMELINE
  • 2021-08-10 - Vulnerability reported to vendor
  • 2021-12-21 - Coordinated public release of advisory
CREDIT Abdelhamid Naceri
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