CVE-2019-20908
First published: Mon Aug 19 2019(Updated: )
A flaw was found in how the ACPI table loading through the EFI variable (and the related efivar_ssdt boot option) was handled when the Linux kernel was locked down. This flaw allows a (root) privileged local user to circumvent the kernel lockdown restrictions. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-193.14.3.rt13.67.el8_2 | 0:4.18.0-193.14.3.rt13.67.el8_2 |
| redhat/kernel | <0:4.18.0-193.14.3.el8_2 | 0:4.18.0-193.14.3.el8_2 |
| redhat/kernel | <0:4.18.0-80.27.2.el8_0 | 0:4.18.0-80.27.2.el8_0 |
| redhat/kernel | <0:4.18.0-147.24.2.el8_1 | 0:4.18.0-147.24.2.el8_1 |
| Linux Linux kernel | <5.4 | |
| openSUSE Leap | =15.1 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
Remedy
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-20908 https://nvd.nist.gov/vuln/detail/CVE-2019-20908 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh https://lore.kernel.org/linux-efi/20200615202408.2242614-1-pjones@redhat.com/ https://www.openwall.com/lists/oss-security/2020/06/14/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1852942
- https://access.redhat.com/errata/RHSA-2020:3219
- https://access.redhat.com/errata/RHSA-2020:3218
- https://access.redhat.com/errata/RHSA-2020:3228
- https://access.redhat.com/errata/RHSA-2020:3222
- 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/2020/07/20/6
- http://www.openwall.com/lists/oss-security/2020/07/29/3
- http://www.openwall.com/lists/oss-security/2020/07/30/2
- http://www.openwall.com/lists/oss-security/2020/07/30/3
- 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://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
- https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
- https://usn.ubuntu.com/4426-1/
- https://usn.ubuntu.com/4427-1/
- https://usn.ubuntu.com/4439-1/
- https://usn.ubuntu.com/4440-1/
- https://launchpad.net/bugs/cve/CVE-2019-20908
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1852944
- https://www.openwall.com/lists/oss-security/2020/06/14/1
- https://lore.kernel.org/linux-efi/20200615202408.2242614-1-pjones@redhat.com/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1857859
- https://git.kernel.org/linus/1957a85b0032a81e6482ca4aab883643b8dae06e
- https://security-tracker.debian.org/tracker/CVE-2019-20908
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20908
- https://nvd.nist.gov/vuln/detail/CVE-2019-20908
- https://ubuntu.com/security/CVE-2019-20908
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2019-20908
- agent/author
- agent/severity
- agent/weakness
- collector/mitre-cve
- source/MITRE
- agent/remedy
- agent/references
- agent/tags
- collector/usn-cve
- source/Ubuntu
- agent/description
- agent/event
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/last-modified-date
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- agent/trending
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- vendor/opensuse
- canonical/opensuse leap
- version/opensuse leap/15.1
- vendor/canonical
- canonical/canonical ubuntu linux
- version/canonical ubuntu linux/16.04
- version/canonical ubuntu linux/18.04
- package-manager/debian