Date: Mon, 20 Jul 2020 18:32:34 +0200 From: Marcus Meissner <meissner@...e.de> 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 Hi, This has gotten assigned CVE-2019-20908. Ciao, Marcus On Mon, Jun 15, 2020 at 05:09:51PM -0700, Reed Loden wrote: > 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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