[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <5673F7F7.5070101@canonical.com>
Date: Fri, 18 Dec 2015 07:11:35 -0500
From: Marc Deslauriers <marc.deslauriers@...onical.com>
To: oss-security@...ts.openwall.com
Subject: Re: AW: CVE Request: Linux kernel: privilege
escalation in user namespaces
Hi,
On 2015-12-18 03:54 AM, Fiedler Roman wrote:
> Hi,
>
>> Von: John Johansen [mailto:john.johansen@...onical.com]
>> Betreff: [oss-security] CVE Request: Linux kernel: privilege escalation in
>> user
>> namespaces
>>
>> Hi,
>>
>> I haven't seen CVE request for this one yet so,
>>
>> Jann Horn reported a privilege escalation in user namespaces to the lkml
>> mailing list
>>
>> https://lkml.org/lkml/2015/12/12/259
>>
>> if a root-owned process wants to enter a user namespace for some reason
>> without knowing who owns it and therefore can't change to the namespace
>> owner's uid and gid before entering, as soon as it has entered the
>> namespace, the namespace owner can attach to it via ptrace and thereby
>> gain access to its uid and gid.
>
> Could it be, that this is identical to
>
> https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1475050
>
> which led to
>
> https://bugs.launchpad.net/bugs/cve/2015-1334
>
> except, that combined with another timerace, this gives host uid 0 escalation
> no matter how the target namespace looks like or target uid is known or not?
>
> The bug is marked as fixed, but looking at it, the very similar kernel issue
> seems not be addressed and it is also still marked "private security" although
> fix was released.
>
> I could ask Ubuntu Security if we should make that bug public or perhaps could
> add accounts to the list of authorized users when told the Launchpad user name
> to add.
>
I've just made the bug public. It was an oversight that we hadn't made it public
once the fix got released.
Marc.
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
