Date: Fri, 25 Feb 2011 09:03:49 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: Kees Cook <kees@...ntu.com> Subject: Re: CVE request: kernel: /sys/kernel/debug/acpi/custom_method can bypass module restrictions On 02/25/2011 08:32 AM, Kees Cook wrote: > Hi, > > While CVE-2010-4347 covers the unprivileged to fully privileged escalation > issue, this interface still allows an unprivileged root user to gain > back all their capabilities. > > Having a system with acpi and debugfs built into the kernel allows > a uid=0 user (without capabilities, e.g. in containers) to write to > arbitrary kernel memory, likely resulting in escalated capability > privileges, or unlocking an otherwise modules-disabled kernel by > changing /proc/sys/kernel/modules_disabled back to 0. Use CVE-2011-1021. Eugene -- Eugene Teo / Red Hat Security Response Team
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