CVE-2019-20908
6.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.4 Medium
AI Score
Confidence
High
6.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
0.0005 Low
EPSS
Percentile
15.8%
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.
References
lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html
www.openwall.com/lists/oss-security/2020/07/20/6
www.openwall.com/lists/oss-security/2020/07/29/3
www.openwall.com/lists/oss-security/2020/07/30/2
www.openwall.com/lists/oss-security/2020/07/30/3
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
usn.ubuntu.com/4426-1/
usn.ubuntu.com/4427-1/
usn.ubuntu.com/4439-1/
usn.ubuntu.com/4440-1/
Related
6.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.4 Medium
AI Score
Confidence
High
6.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
0.0005 Low
EPSS
Percentile
15.8%