Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2019-20908

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.

Published

2020-07-15T22:15:13.780

Last Modified

2024-11-21T04:39:39.697

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.7 (MEDIUM)

CVSSv2 Vector

AV:L/AC:M/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.4

Impact Score

10.0

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	linux	linux_kernel	< 5.4	Yes
Operating System	opensuse	leap	15.1	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2020/07/20/6 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2020/07/30/2 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2020/07/30/3 Mailing List, Third Party Advisory ([email protected])
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4 Release Notes, Vendor Advisory ([email protected])
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e Patch, Vendor Advisory ([email protected])
https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh Patch, Third Party Advisory ([email protected])
https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html Mailing List, Third Party Advisory ([email protected])
https://usn.ubuntu.com/4426-1/ Third Party Advisory ([email protected])
https://usn.ubuntu.com/4427-1/ Third Party Advisory ([email protected])
https://usn.ubuntu.com/4439-1/ Third Party Advisory ([email protected])
https://usn.ubuntu.com/4440-1/ Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2020/07/20/6 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2020/07/30/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2020/07/30/3 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4 Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4426-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4427-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4439-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4440-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)