Security Update for Secure Boot

1) Secure Boot feature bypass

EUVDB-ID: #VU291

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-3320

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local user to bypass security restrictions and gain elevated privileges on vulnerable system.

The vulnerability exists due Windows Secure Boot incorrectly loads boot manager. A local user with physical access to computer and local administrative rights can disable code integrity checks, allowing test-signed executables and drivers to be loaded onto a target device, and bypass Secure Boot Integrity Validation for BitLocker and Device Encryption security features.

Successful exploitation of this vulnerability will allow a local user to gain complete access to vulnerable system.

Mitigation

Install updates from Microsoft website.

Vulnerable software versions

Windows: 8.1 - 10

Windows Server: 2012 - 2012 R2

External links

http://technet.microsoft.com/en-us/library/security/ms16-100.aspx

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.