Multiple vulnerabilities in Microsoft .NET Core and Visual Studio
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-34532 CVE-2021-34485 CVE-2021-26423 |
| CWE-ID | CWE-200 CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
ASP.NET Core MVC Universal components / Libraries / Software for developers Visual Studio Universal components / Libraries / Software for developers Microsoft .NET Core Server applications / Frameworks for developing and running applications |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Information disclosure
EUVDB-ID: #VU55692
Risk: Low
CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-34532
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in the ASP.NET Core and Visual Studio. A local user can gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsASP.NET Core MVC: 2.1.0 - 3.1
Visual Studio: 16.4.0 16.4.29519.181
CPE2.3- cpe:2.3:a:microsoft:aspnet_core_mvc:2.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:aspnet_core_mvc:3.1:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio:16.4.0:16.4.29519.181:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34532
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.
2) Information disclosure
EUVDB-ID: #VU55693
Risk: Low
CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-34485
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in the .NET Core and Visual Studio. A local user can gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsVisual Studio: 15.9 - 16.4.0 16.4.29519.181
ASP.NET Core MVC: 2.1.0
Microsoft .NET Core: 3.1
CPE2.3- cpe:2.3:a:microsoft:visual_studio:15.9:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:aspnet_core_mvc:2.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_.net_core:3.1:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34485
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.
3) Input validation error
EUVDB-ID: #VU55694
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-2021-26423
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe 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 the .NET Core and Visual Studio. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsVisual Studio: 15.9 - 16.4.0 16.4.29519.181
ASP.NET Core MVC: 2.1.0
Microsoft .NET Core: 3.1
CPE2.3 External linkshttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423
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.
