#VU53123 Permissions, Privileges, and Access Controls in Microsoft .NET Core and Visual Studio - CVE-2021-31204

Vulnerability identifier: #VU53123

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31204

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Microsoft .NET Core
Server applications / Frameworks for developing and running applications
Visual Studio
Universal components / Libraries / Software for developers

Vendor: Microsoft

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in .NET and Visual Studio, which leads to security restrictions bypass and privilege escalation.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft .NET Core: 3.1, 5.0.0

Visual Studio: 16.4.0 16.4.29519.181, 16.7.0 16.7.30330.147, 16.9.0 16.9.31025.194, 2019 for Mac version 8.9

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31204

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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.