CVE-2024-21338MicrosoftOperating systemsMarch 4, 2024

Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability

High 7.8Actively exploitedUsed by ransomware

Description

Microsoft Windows Kernel contains an exposed IOCTL with insufficient access control vulnerability within the IOCTL (input and output control) dispatcher in appid.sys that allows a local attacker to achieve privilege escalation.

What to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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Details

Vendor
Microsoft
Product
Windows
CVE
CVE-2024-21338
Affected versions
Windows 10 Version 1809 10.0: from 10.0.17763.0 to 10.0.17763.5458 (excluded); from 10.0.0 to 10.0.17763.5458 (excluded) — fixed in 10.0.17763.5458
Windows 10 Version 21H2 10.0: from 10.0.19043.0 to 10.0.19044.4046 (excluded) — fixed in 10.0.19044.4046
Windows 10 Version 22H2 10.0: from 10.0.19045.0 to 10.0.19045.4046 (excluded) — fixed in 10.0.19045.4046
Windows 11 version 21H2 10.0: from 10.0.0 to 10.0.22000.2777 (excluded) — fixed in 10.0.22000.2777
Windows 11 version 22H2 10.0: from 10.0.22621.0 to 10.0.22621.3155 (excluded) — fixed in 10.0.22621.3155
Windows 11 version 22H3 10.0: from 10.0.22631.0 to 10.0.22631.3155 (excluded) — fixed in 10.0.22631.3155
Windows 11 Version 23H2 10.0: from 10.0.22631.0 to 10.0.22631.3155 (excluded) — fixed in 10.0.22631.3155
Windows Server 2019 10.0: from 10.0.17763.0 to 10.0.17763.5458 (excluded) — fixed in 10.0.17763.5458
Windows Server 2019 (Server Core installation) 10.0: from 10.0.17763.0 to 10.0.17763.5458 (excluded) — fixed in 10.0.17763.5458
Windows Server 2022 10.0: from 10.0.20348.0 to 10.0.20348.2322 (excluded) — fixed in 10.0.20348.2322
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0: from 10.0.25398.0 to 10.0.25398.709 (excluded) — fixed in 10.0.25398.709 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
7.8
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
March 25, 2024 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
March 4, 2024

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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