cve/2019/CVE-2019-20908.md

CVE-2019-20908

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.

POC

Reference

• http://www.openwall.com/lists/oss-security/2020/07/20/6
• 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://usn.ubuntu.com/4426-1/

Github

• https://github.com/Annavid/CVE-2020-15780-exploit