Date: Mon, 15 Jun 2020 17:09:51 -0700 From: Reed Loden <reed@...dloden.com> To: oss-security@...ts.openwall.com Cc: cve-assign@...re.org Subject: Re: Re: lockdown bypass on ubuntu 18.04's 4.15 kernel for loading unsigned modules Please use https://cveform.mitre.org/ to request a CVE directly from MITRE. That’s your quickest and best way. :-) ~reed On Mon, Jun 15, 2020 at 4:02 PM Jason A. Donenfeld <Jason@...c4.com> wrote: > 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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