oss-security - Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets

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Date: Mon, 10 May 2021 16:22:20 +0930
From: Alex Murray <alex.murray@...onical.com>
To: oss-security@...ts.openwall.com
Cc: Nadav Markus <nmarkus@...oaltonetworks.com>, Or Cohen
 <orcohen@...oaltonetworks.com>, Salvatore Bonaccorso <carnil@...ian.org>
Subject: Re: CVE-2021-23133: Linux kernel: race condition in
 sctp sockets


On Mon, 2021-05-10 at 15:40:53 +0930, Salvatore Bonaccorso wrote:

> Hi Alex,
>
> On Mon, May 10, 2021 at 03:28:02PM +0930, Alex Murray wrote:
>> 
>> On Mon, 2021-05-10 at 13:54:43 +0930, Salvatore Bonaccorso wrote:
>> 
>> > Hi,
>> > 
>> > On Sun, Apr 18, 2021 at 11:41:06AM +0300, Or Cohen wrote:
>> > > Hello,
>> > > 
>> > > This is an announcement about CVE-2021-23133 which is a 
>> > > race-condition
>> > > I found in Linux kernel sctp sockets (net/sctp/socket.c). It can
>> > > lead to kernel
>> > > privilege escalation from the context of a network service or from
>> > > an unprivileged process if certain conditions are met.
>> > > 
>> > > The bug was fixed on April 13, 2021:
>> > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b
>> > 
>> > It looks that additionally
>> > https://git.kernel.org/linus/34e5b01186858b36c4d7c87e1a025071e8e2401f
>> > refer to CVE-2021-23133.
>> 
>> It seems b166a20b07382b8bc1dcee2a448715c9c2c81b5b got reverted in the
>> follow-up commit
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/sctp/socket.c?id=01bfe5e8e428b475982a98a46cca5755726f3f7f
>> and so 34e5b01186858b36c4d7c87e1a025071e8e2401f would appear to be the
>> most correct fix from what I can tell.
>
> Ah right, I missed the revert of the original commit.
>
> Thanks for pointing that to me.

No worries - thanks for pointing out the new commit otherwise I wouldn't
have gone investigating to find the revert ;)

>
> Regards,
> Salvatore

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