#VU6021 Improper input validation in Windows and Windows Server - CVE-2017-0007

Vulnerability identifier: #VU6021

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-0007

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to bypass certain security restrictions

The vulnerability exists due to insufficient validation of certain elements of a signed PowerShell script within Device Guard. A remote attacker can modify the contents of a PowerShell script without invalidating the signature associated with the file and execute it on vulnerable system.

Successful exploitation of this vulnerability may allow a remote attacker to bypass implemented signature-based protection and compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10

Windows Server: 2016 10.0.14393.10

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External links
https://technet.microsoft.com/en-us/library/security/MS17-012

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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.