Date: Mon, 15 Jun 2020 17:02:05 -0600 From: "Jason A. Donenfeld" <Jason@...c4.com> To: oss-security <oss-security@...ts.openwall.com>, cve-assign@...re.org Subject: Re: lockdown bypass on ubuntu 18.04's 4.15 kernel for loading unsigned modules Hi Mitre, People are requesting a CVE to track this and are poking me to poke you to assign one. Jason On Sun, Jun 14, 2020 at 12:30 AM Jason A. Donenfeld <Jason@...c4.com> wrote: > > Hey folks, > > I noticed that Ubuntu 18.04's 4.15 kernels forgot to protect > efivar_ssdt with lockdown, making that a vector for disabling lockdown > on an efi secure boot machine. I wrote a little PoC exploit to > demonstrate these types of ACPI shenanigans: > > https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh > > The comment on the top has description of exploit strategy and such. I > haven't yet looked into other kernels and distros that might be > affected, though afaict, Canonical's kernel seems to deviate a lot > from upstream. > > Jason
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