Vulnerability identifier: #VU73517

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-23392

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows Server
Operating systems & Components / Operating system
Windows
Operating systems & Components / Operating system
Microsoft IIS
Server applications / Web servers

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input in the HTTP Protocol Stack (http.sys) when handling HTTP/3 requests. A remote attacker can send a specially crafted HTTP/3 request to the affected server and execute arbitrary code on the system.

Successful exploitation of the vulnerability requires HTTP/3 to be enabled on the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2022 - 2022 20H2

Windows: 11 - 11 22H2

Microsoft IIS: 10.0

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-23392

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.