Information disclosure in Microsoft Windows HTTP.sys driver

1) Out-of-bounds read

EUVDB-ID: #VU72175

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 - Out-of-bounds read

Exploit availability: No

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 - 11 22H2 10.0.22621.521

CPE2.3

• cpe:2.3:o:microsoft:windows_server:2022:10.0.20348.202:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2022:20H2:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:11_21H2:10.0.22000.194:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:11_22H2:10.0.22621.521:*:*:*:*:*:*

External links

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

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.