Date: Mon, 15 Jun 2020 17:22:27 +0100 From: John Haxby <john.haxby@...cle.com> To: oss-security@...ts.openwall.com, "Jason A. Donenfeld" <Jason@...c4.com> Cc: linux-security-module@...r.kernel.org, linux-acpi@...r.kernel.org, Matthew Garrett <mjg59@...f.ucam.org>, kernel-hardening@...ts.openwall.com, Ubuntu Kernel Team <kernel-team@...ts.ubuntu.com> Subject: Re: [oss-security] lockdown bypass on mainline kernel for loading unsigned modules Hi Jason, > On 15 Jun 2020, at 11:26, Jason A. Donenfeld <Jason@...c4.com> wrote: > > Hi everyone, > > Yesterday, I found a lockdown bypass in Ubuntu 18.04's kernel using > ACPI table tricks via the efi ssdt variable . Today I found another > one that's a bit easier to exploit and appears to be unpatched on > mainline, using acpi_configfs to inject an ACPI table. The tricks are > basically the same as the first one, but this one appears to be > unpatched, at least on my test machine. Explanation is in the header > of the PoC: > > https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language-2.sh > > I need to get some sleep, but if nobody posts a patch in the > meanwhile, I'll try to post a fix tomorrow. > > Jason > >  https://www.openwall.com/lists/oss-security/2020/06/14/1 This looks CVE-worthy. Are you going to ask for a CVE for it? jch Download attachment "signature.asc" of type "application/pgp-signature" (269 bytes)
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.