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CVE-2019-20908

Good to know:

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Date: July 15, 2020

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

Language: C

Severity Score

Related Resources (18)

https://nvd.nist.gov/vuln/detail/CVE-2019-20908
https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
https://usn.ubuntu.com/4439-1/
https://usn.ubuntu.com/4440-1/
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
https://access.redhat.com/security/cve/CVE-2019-20908
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html
http://www.openwall.com/lists/oss-security/2020/07/30/3
https://security-tracker.debian.org/tracker/CVE-2019-20908
http://www.openwall.com/lists/oss-security/2020/07/30/2
https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
http://www.openwall.com/lists/oss-security/2020/07/20/6
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20908
https://usn.ubuntu.com/4427-1/
https://usn.ubuntu.com/4426-1/
http://www.openwall.com/lists/oss-security/2020/07/29/3
https://www.mend.io/vulnerability-database/CVE-2019-20908

Severity Score

Weakness Type (CWE)

Improper Privilege Management

CWE-269

Incorrect Default Permissions

CWE-276

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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