#VU72215 Input validation error in Microsoft products - CVE-2023-21808

Vulnerability identifier: #VU72215

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-21808

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise the affected system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Visual Studio: 15.9 - 15.9.51, 16.0.0 16.0.28729.10 - 16.0.22 16.0.28803.916, 16.1.0 16.1.28917.181 - 16.11.23 16.11.33214.272, 16.2.0 16.2.29123.88 - 16.2.5 16.2.29306.81, 16.3.0 16.3.29318.209 - 16.3.10 16.3.29519.87, 16.4.0 16.4.29519.181 - 16.4.27 16.4.31728.76, 16.5.0 16.5.29911.84 - 16.5.5 16.5.30104.148, 16.6.0 16.6.30114.105 - 16.6.5 16.6.30320.27, 16.7.0 16.7.30330.147 - 16.7.28 16.7.32413.119, 16.8.0 16.8.30709.132 - 16.8.7 16.8.31025.109, 16.9.0 16.9.31025.194 - 16.9.26 16.9.32930.78, 17.0.0 17.0.31903.59 - 17.0.18 17.0.33214.273, 17.1.0 17.1.32210.238 - 17.1.7 17.1.32428.221, 17.2.0 17.2.32505.173 - 17.2.12 17.2.33214.139, 17.3.0 17.3.32804.467 - 17.3.7 17.3.33027.108, 17.4.0 17.4.33103.184 - 17.4.4 17.4.33213.308

Microsoft .NET Framework: 3.5, 4.6.2, 4.7.1 - 4.7.2, 4.8 - 4.8.1

Microsoft .NET Core: 6.0.0 - 6.0.13, 7.0.0 - 7.0.2

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-21808

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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.