Vulnerability identifier: #VU12491

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8126

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to an error when Internet Explorer fails to validate User Mode Code Integrity (UMCI) policies. A remote attacker can trick the victim into visiting a specially crafted website, run unsigned malicious code as though it were signed by a trusted source and bypass Device Guard UMCI policies.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Internet Explorer: 11

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8126

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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.