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Date: Thu, 20 Nov 2014 01:53:23 -0500 (EST)
From: cve-assign@...re.org
To: luto@...capital.net
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: Linux user namespaces can bypass group-based restrictions - Linux kernel

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> On Linux, if you can unshare your user namespace (which is the case on
> many distributions), then you can map your fsuid and fsgid into the
> new namespace and, inside that namespace, drop all of your other
> groups.
> 
> This may allow you to access files protected by POSIX ACLs as "other",
> even if the ACL should have prohibited it based on one of your
> supplementary group IDs.

> http://thread.gmane.org/gmane.linux.man/7385/

> defeats POSIX ACLs with a group entry that is more restrictive than
> the other entry

> Fedora and Ubuntu are likely to be affected in their default
> configurations.

Use CVE-2014-8989.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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