#VU12491 Security restrictions bypass in Microsoft Internet Explorer - CVE-2018-8126

Vulnerability identifier: #VU12491

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

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
https://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.