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Message-ID: <4EA83120.80106@redhat.com>
Date: Wed, 26 Oct 2011 10:11:12 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: CVE Request -- kernel: sysctl: restrict write
access to dmesg_restrict
On 10/26/2011 09:53 AM, Vasiliy Kulikov wrote:
> Hi,
>
> On Wed, Oct 26, 2011 at 09:26 -0600, Kurt Seifried wrote:
>> On 10/26/2011 09:16 AM, Petr Matousek wrote:
>>> When dmesg_restrict is set to 1 CAP_SYS_ADMIN is needed to read the
>>> kernel ring buffer. But a root user without CAP_SYS_ADMIN is able
>>> to reset dmesg_restrict to 0.
>>>
>>> This is an issue when e.g. LXC (Linux Containers) are used and complete
>>> user space is running without CAP_SYS_ADMIN. A unprivileged and jailed
>>> root user can bypass the dmesg_restrict protection.
>>>
>>> Introduced by:
>>> eaf06b241b091357e72b76863ba16e89610d31bd
>>>
>>> Fixed by:
>>> bfdc0b497faa82a0ba2f9dddcf109231dd519fcc
>>>
>>> Thanks,
>> Please use CVE-2011-4080 for this issue.
> Why does it worth CVE?
This allows an attacker to bypass a security boundary. The root user is
able to gain privileges they shouldn't have.
--
-Kurt Seifried / Red Hat Security Response Team
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