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

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210510061053.GA23700@lorien.valinor.li>
Date: Mon, 10 May 2021 08:10:53 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: Alex Murray <alex.murray@...onical.com>
Cc: oss-security@...ts.openwall.com,
	Nadav Markus <nmarkus@...oaltonetworks.com>,
	Or Cohen <orcohen@...oaltonetworks.com>
Subject: Re: CVE-2021-23133: Linux kernel: race condition in
 sctp sockets

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.

Regards,
Salvatore

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.