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alpine-devel

Re: [alpine-devel] CVE-2016-5195: Local privilege escalation exploit in Linux kernel

From: Kevin Gallagher <kevingallagher_at_gmail.com>
Date: Fri, 21 Oct 2016 03:02:23 -0700

Same deal on non-Alpine grsec. Think it's cause of grsec /proc
restrictions in general, but I don't know a ton about the memory subsystem.


On 10/21/2016 03:00 AM, 7heo wrote:
> Could it be that /proc/self/mem is also not writable in alpine?
>
> On Fri Oct 21 11:23:40 2016 GMT+0200, Kevin M. Gallagher wrote:
>> I just tried to execute the proof-of-concept on Alpine, and it didn't work
>> (the file is supposed to be overwritten). No grsec messages logged, but I
>> figure maybe it's not effective under grsecurity for some reason. Still a
>> good idea to patch anyway...
>>
>> On Fri, Oct 21, 2016 at 1:50 AM, Kevin M. Gallagher <
>> kevingallagher_at_gmail.com> wrote:
>>
>>> Great to hear. Thanks a lot, Natanael!
>>>
>>> On Fri, Oct 21, 2016 at 1:38 AM, Natanael Copa <ncopa_at_alpinelinux.org>
>>> wrote:
>>>
>>>> On Thu, 20 Oct 2016 21:53:03 -0700
>>>> "Kevin M. Gallagher" <kevingallagher_at_gmail.com> wrote:
>>>>
>>>>> Details:
>>>>>
>>>>> http://dirtycow.ninja/
>>>>> https://lkml.org/lkml/2016/10/19/860
>>>>>
>>>>> Proof of concept:
>>>>> https://github.com/dirtycow/dirtycow.github.io/blob/master/dirtyc0w.c
>>>>>
>>>>> I'm using Alpine Linux for a time-urgent and security-critical project
>>>>> happening this weekend, and would really like to see this fixed.
>>>> However,
>>>>> I'm not familiar with aports or the way you build kernels in Alpine. Is
>>>>> anyone available to update the kernel in linux-grsec in the 3.4-stable
>>>>> branch and/or backport the patch, sometime soon?
>>>> Yes. Updated kernels will be available with an hour or two. At least
>>>> for edge and v3.4.
>>>>
>>>> -nc
>>>>
>>>
> >






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dirtycow_grsec.png
(image/png attachment: dirtycow_grsec.png)

Received on Fri Oct 21 2016 - 03:02:23 GMT