Denial of service in Microsoft .NET Core and Visual Studio

1) Input validation error

EUVDB-ID: #VU53881

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-31957

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 .NET Core and Visual Studio. 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

Visual Studio: 16.4.0 16.4.29519.181 - 16.10.0 16.10.31321.278

Microsoft .NET Core: 3.1 - 5.0.0

CPE2.3

• cpe:2.3:a:microsoft:visual_studio:16.4.0:16.4.29519.181:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.7.0:16.7.30330.147:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.9.0:16.9.31025.194:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.10.0:16.10.31321.278:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_.net_core:3.1:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_.net_core:5.0.0:*:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31957

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.