Vulnerability identifier: #VU13769

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8356

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

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

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The vulnerability exists due to  improper validation of certificates by .NET Framework components. A remote unauthenticated attacker can present expired certificates when challenged and bypass security restrictions to conduct further attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft .NET Framework: 4.5.2, 4.6, 3.5.1, 3.5, 3.0, 4.6.2, 4.7.2, 4.7.1, 4.7

ASP.NET Core MVC: 1.0.0 - 2.0

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8356

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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.