#VU72175 Out-of-bounds read in Windows Server and Windows - CVE-2023-21687

Vulnerability identifier: #VU72175

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-21687

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Windows Server
Operating systems & Components / Operating system
Windows
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the HTTP.sys driver. A local user can trigger an out-of-bounds read error and read contents of Kernel memory from a user mode process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2022 10.0.20348.202 - 2022 20H2

Windows: 11 21H2 10.0.22000.194, 11 22H2 10.0.22621.521, 11

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-21687

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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