Secure Boot bypass in Microsoft Windows

Published: 2016-08-10
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2016-3320
CWE ID CWE-284
Exploitation vector Local
Public exploit N/A
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

This security advisory describes one low risk vulnerability.

1) Secure Boot feature bypass

Severity: Low

CVSSv3: 7.7 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2016-3320

CWE-ID: CWE-284 - Improper Access Control

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.

Vulnerable software versions

Windows: 8.1, 10, RT 8.1

Windows Server: 2012, 2012 R2

CPE External links

https://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.