Denial of service in Microsoft .NET

1) Input validation error

EUVDB-ID: #VU60380

Risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2022-21986

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in ASP.NET Core Krestel when pooling HTTP/2 and HTTP/3 headers. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft .NET Core: 5.0.0 - 6.0.0

Visual Studio: 16.0.0 16.0.28729.10 - 2019 for Mac version 8.10

CPE2.3

• cpe:2.3:a:microsoft:microsoft_.net_core:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_.net_core:6.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.0.0:16.0.28729.10:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.11.0:16.11.31605.320:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.2.0:16.2.29123.88:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.3.0:16.3.29318.209:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.4.0:16.4.29519.181:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.5.0:16.5.29911.84:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.6.0:16.6.30114.105:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.7.0:16.7.30330.147:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21986
https://bugzilla.redhat.com/show_bug.cgi?id=2051490

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.