Privilege escalation in Microsoft ASP.NET Core and Visual Studio

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU58923

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-43877

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

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 ASP.NET Core and Visual Studio, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ASP.NET Core: 3.1 - 6.0

Visual Studio: 16.0.0 16.0.28729.10 - 17.0.0 17.0.31903.59

CPE2.3

• cpe:2.3:a:microsoft:asp.net_core:3.1:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:asp.net_core:5.0:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:asp.net_core:6.0:*:*:*:*:*:*:
• 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:*:*:*:*:*:

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43877

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.