oss-sec mailing list archives
Re: lockdown bypass on mainline kernel for loading unsigned modules
From: John Haxby <john.haxby () oracle com>
Date: Mon, 15 Jun 2020 17:22:27 +0100
Hi Jason,
On 15 Jun 2020, at 11:26, Jason A. Donenfeld <Jason () zx2c4 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 [1]. 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 [1] 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
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Current thread:
- lockdown bypass on mainline kernel for loading unsigned modules Jason A. Donenfeld (Jun 15)
- Re: lockdown bypass on mainline kernel for loading unsigned modules John Haxby (Jun 15)
- Re: lockdown bypass on mainline kernel for loading unsigned modules Jann Horn (Jun 15)
- Re: lockdown bypass on mainline kernel for loading unsigned modules Jason A. Donenfeld (Jun 15)
- Re: lockdown bypass on mainline kernel for loading unsigned modules Jann Horn (Jun 15)
- Re: lockdown bypass on mainline kernel for loading unsigned modules Jason A. Donenfeld (Jun 15)
- Re: lockdown bypass on mainline kernel for loading unsigned modules John Haxby (Jun 15)