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Date: Wed, 13 Aug 2014 16:08:04 +0000
From: Sven Kieske <S.Kieske@...twald.de>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: Re: CVE Request: ro bind mount bypass using user
 namespaces



Am 12.08.2014 23:48, schrieb Kenton Varda:
> Due to a bug in the Linux kernel's implementation of remount, on systems
> with unprivileged user namespaces enabled, it is possible for an
> unprivileged user to gain write access to any visible read-only bind mount.
> It is also possible to bypass flags like nodev, nosuid, and noexec.

Hi,

does someone happen to know in which released kernel version this bug
got introduced?

Was it always there since remounting of bind mounts was possible?

according to debian this at least affects 2.6.32 kernels
in oldstable:

https://security-tracker.debian.org/tracker/CVE-2014-5206
https://security-tracker.debian.org/tracker/CVE-2014-5207

Sadly I can't find any other public available bugtracker
from redhat, gentoo etc. who track these.

-- 
Mit freundlichen Grüßen / Regards

Sven Kieske

Systemadministrator
Mittwald CM Service GmbH & Co. KG
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