Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.4 |
| Opensuse | Leap | 15.1 |
| Canonical | Ubuntu Linux | 16.04 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/20/6Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/30/2Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/30/3Mailing ListThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4Release NotesVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19PatchVendor Advisory
- https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-languagePatchThird Party Advisory
- https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.htmlMailing ListThird Party Advisory
- https://usn.ubuntu.com/4426-1/Third Party Advisory
- https://usn.ubuntu.com/4427-1/Third Party Advisory
- https://usn.ubuntu.com/4439-1/Third Party Advisory
- https://usn.ubuntu.com/4440-1/Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/20/6Mailing ListThird Party Advisory
FAQ
What is CVE-2019-20908?
CVE-2019-20908 is a vulnerability with a CVSS score of 6.7 (MEDIUM). 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 se...
How severe is CVE-2019-20908?
CVE-2019-20908 has been rated MEDIUM with a CVSS base score of 6.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-20908?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Opensuse Leap, Canonical Ubuntu Linux.