SB2021020950 - Multiple vulnerabilities in Microsoft .NET Core and Visual Studio

Description

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2021-1721)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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.

2) Input validation error (CVE-ID: CVE-2021-24112)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input in .NET Core. A remote attacker can pass specially crafted input to the application and execute arbitrary code on the target system.

3) Input validation error (CVE-ID: CVE-2021-26701)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input in .NET Core. A remote attacker can pass specially crafted input to the application and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1721
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24112
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26701