CVE-2019-20908

Impact

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

References

• NVD record
• CVE.org record
• 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/
• 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/