lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <2024070208-legume-possible-de8b@gregkh>
Date: Tue, 2 Jul 2024 21:19:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Michal Koutný <mkoutny@...e.com>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org,
	linux-cve-announce@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: CVE-2021-47285: net/nfc/rawsock.c: fix a permission check bug

On Tue, Jul 02, 2024 at 06:15:09PM +0200, Michal Koutný wrote:
> Hello.
> 
> On Tue, May 21, 2024 at 04:20:39PM GMT, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> > In the Linux kernel, the following vulnerability has been resolved:
> > 
> > net/nfc/rawsock.c: fix a permission check bug
> > 
> > The function rawsock_create() calls a privileged function sk_alloc(), which requires a ns-aware check to check net->user_ns, i.e., ns_capable(). However, the original code checks the init_user_ns using capable(). So we replace the capable() with ns_capable().
> > 
> > The Linux kernel CVE team has assigned CVE-2021-47285 to this issue.
> > ...
> > 	https://git.kernel.org/stable/c/8ab78863e9eff11910e1ac8bcf478060c29b379e
> 
> Despite the patch changes guard related to EPERM bailout, it actually
> swaps a "stronger" predicate capable() for a "weaker" ns_capable().
> 
> Without the patch, an unprivilged user is not allowed to create nfc
> SOCK_RAW inside owned netns, with the patch, it's allowed.

Ah, we misread this, thinking it went up in security, not "down".

And this was from the old GSD ids, odd that no one noticed it then :(

Anyway, now rejected, thanks for the review!

greg k-h

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ