Denial of service in Microsoft Windows Server

1) Resource exhaustion

EUVDB-ID: #VU86377

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-50387

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation when processing DNSSEC related records. A remote attacker can trigger resource exhaustion by forcing the DNS server to query a specially crafted DNSSEC zone and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows Server: 2008 R2 - 2022 23H2

CPE2.3

• cpe:2.3:o:microsoft:windows_server:2008_R2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.10:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019_20H2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019_1709:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019_1803:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019_1903:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019_1909:*:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-50387

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. However, proof of concept for this vulnerability is available.