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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
n/a n/a
n/aaffected
References
- 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e ↗
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4 ↗
- http://www.openwall.com/lists/oss-security/2020/07/20/6 ↗
- https://usn.ubuntu.com/4427-1/ ↗
- http://www.openwall.com/lists/oss-security/2020/07/29/3 ↗
- http://www.openwall.com/lists/oss-security/2020/07/30/3 ↗
- http://www.openwall.com/lists/oss-security/2020/07/30/2 ↗
- https://usn.ubuntu.com/4439-1/ ↗
- https://usn.ubuntu.com/4426-1/ ↗
- https://usn.ubuntu.com/4440-1/ ↗
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html ↗