CVE-2024-21338: Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability
First published: Tue Feb 13 2024(Updated: )
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.
Credit: E1 Coders secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 11 | =23H2 | |
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows 11 | =23H2 | |
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows | ||
| Microsoft Windows 10 1809 | <10.0.17763.5458 | |
| Microsoft Windows 10 21h2 | <10.0.19044.4046 | |
| Microsoft Windows 10 22h2 | <10.0.19045.4046 | |
| Microsoft Windows 11 21h2 | <10.0.22000.2777 | |
| Microsoft Windows 11 22h2 | <10.0.22621.3155 | |
| Microsoft Windows 11 23h2 | <10.0.22631.3155 | |
| Microsoft Windows Server 2019 | <10.0.17763.5458 | |
| Microsoft Windows Server 2022 | <10.0.20348.2322 | |
| Microsoft Windows Server 2022 23H2 | <=10.0.25398.709 | |
| Microsoft Windows Server 2022 23H2 |
Remedy
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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Reference Links
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338 (Advisory)
- https://www.bleepingcomputer.com/news/security/lazarus-hackers-exploited-windows-zero-day-to-gain-kernel-privileges/
- https://www.bleepingcomputer.com/news/security/windows-kernel-bug-fixed-last-month-exploited-as-zero-day-since-august/
- https://www.theregister.com/2024/03/11/infosec_news_in_brief/
- https://www.exploit-db.com/exploits/51946
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338;
- https://nvd.nist.gov/vuln/detail/CVE-2024-21338
Frequently Asked Questions
What is the severity of CVE-2024-21338?
CVE-2024-21338 is classified as a critical vulnerability that allows for privilege escalation in Microsoft Windows Kernel.
How do I fix CVE-2024-21338?
To fix CVE-2024-21338, apply the latest security updates provided by Microsoft for the affected Windows versions.
What versions of Windows are affected by CVE-2024-21338?
CVE-2024-21338 affects Windows 10, Windows 11, and Windows Server 2019 and 2022 across specific versions and builds.
Who can exploit CVE-2024-21338?
CVE-2024-21338 can be exploited by local attackers with access to the system, allowing them to escalate their privileges.
What is the impact of CVE-2024-21338?
The impact of CVE-2024-21338 includes potential unauthorized access to sensitive system operations due to privilege escalation.
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