Vulnerability identifier: #VU31922

Vulnerability risk: Low

CVSSv3.1: 6 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-15780

CWE-ID: CWE-285

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to bypass authorization checks.

The vulnerability exists due to improper authorization in "in drivers/acpi/acpi_configfs.c". A local administrator can inject malicious ACPI tables via configfs to bypass lockdown and secure boot restrictions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.7.1 - 5.7.6

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External links
http://www.openwall.com/lists/oss-security/2020/07/20/7
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.7
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75b0cea7bf307f362057cc778efe89af4c615354
http://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language-2.sh
http://www.openwall.com/lists/oss-security/2020/06/15/3

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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. However, proof of concept for this vulnerability is available.