#VU19137 Input validation error in Microsoft .NET Framework and Visual Studio - CVE-2019-1113

Vulnerability identifier: #VU19137

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-1113

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: Microsoft

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when the software fails to check the source markup of a file.

An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user in .NET software. Successful exploitation of the vulnerability allows remote code execution but requires that a user open a specially crafted file with an affected version of .NET Framework.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft .NET Framework: 2.0, 3.0, 3.5 - 3.5.1, 4.5.2, 4.6 - 4.6.2, 4.7 - 4.7.2, 4.8

Visual Studio: 15.0 26228.04, 15.9, 16.0.0 16.0.28729.10, 16.1.0 16.1.28917.181

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1113

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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.