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Message-ID: <CAJ_zFkLA=Qn_exvDW8Rym1jx_jS0vo=vuTJ7ON71qk8BSB=1dw@mail.gmail.com>
Date: Tue, 14 Apr 2015 14:10:12 -0700
From: Tavis Ormandy <taviso@...gle.com>
To: oss-security@...ts.openwall.com
Cc: Assign a CVE Identifier <cve-assign@...re.org>, security <security@...ntu.com>
Subject: Re: Re: Problems in automatic crash analysis frameworks
On Tue, Apr 14, 2015 at 2:08 PM, Tavis Ormandy <taviso@...gle.com> wrote:
> On Tue, Apr 14, 2015 at 1:35 PM, Tavis Ormandy <taviso@...gle.com> wrote:
>> On Tue, Apr 14, 2015 at 9:02 AM, Marc Deslauriers
>> <marc.deslauriers@...onical.com> wrote:
>>> Hi,
>>>
>>> On 2015-04-14 11:55 AM, cve-assign@...re.org wrote:
>>>> This is mostly a question for the persons who assigned CVE-2015-1318
>>>> and CVE-2015-1862. Should these CVE assignments be interpreted to
>>>> mean:
>>>>
>>>> CVE-2015-1318 - in Apport, an unprivileged user can use a
>>>> namespace-based attack because there is an execve by
>>>> root after a chroot into a user-specified directory
>>>
>>> Yes, I assigned CVE-2015-1318 to that specific issue in Apport.
>>>
>>> Marc.
>>
>> It looks like this is the patch for Apport:
>>
>> http://bazaar.launchpad.net/~apport-hackers/apport/trunk/revision/2943#data/apport
>>
>> It's far more complicated than I expected, and not obviously correct.
>> It could probably use some review, I'll think about it today.
>>
>> Tavis.
>
> Wait, my first thought is that it's not obvious to me that
> /proc/net/unix is guaranteed to be newline delimited, newline is a
> perfectly valid name in a filename, no?
>
>>>> import socket
>>>> socket.socket(socket.AF_UNIX, socket.SOCK_STREAM).bind('test\ntest')
>>>> sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
>>>> sock.bind('/tmp/foo\nbar')
>>>> sock.listen(1)
>
> $ grep -A1 foo /proc/net/unix
> 0000000000000000: 00000002 00000000 00010000 0001 01 4772228 /tmp/foo
> bar
And with complete control over this line, it seems like it's game over.
container = lxc.Container(path[-2], real_path)
I'm calling this re-broken.
Tavis.
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