oss-sec mailing list archives
Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node
From: Diogo Monica <diogo.monica () docker com>
Date: Fri, 2 Sep 2016 02:48:30 +0000 (UTC)
Can you please describe how this vulnerability makes a worker node be able to administer the swarm? On Thu, Sep 1, 2016 at 7:12 PM -0700, "Kurt Seifried" <kseifried () redhat com> wrote: On Thu, Sep 1, 2016 at 5:17 PM, Diogo Mónica wrote:
A few weeks ago (Aug 4, 2016), a CVE (CVE-2016-6595) describing a DoS on docker swarm got issued. We believe this not a real issue, and would like to have the CVE rescinded. The person reporting this "vulnerability" is exhausting the resources of a remote manager by doing hundreds of join/leave operations without removing the state that is left by old nodes. At some point the manager obviously stops being able to accept new nodes, since it runs out of memory. Given that both for Docker swarm and for Docker Swarmkit nodes are *required* to provide a secret token (it's actually the only mode of operation), this means that no adversary can simply join nodes and exhaust manager resources. We can't do anything about a manager running out of memory and not being able to add new legitimate nodes to the system. This is merely a resource provisioning issue, and definitely not a CVE worthy vulnerability.
I checked the documentation and it looks like a worker node is only supposed to work and is not supposed to be able to administer the swarm. As such this is a trust boundary violation, and needs a CVE.
Thank you, -- Diogo Mónica
-- -- Kurt Seifried -- Red Hat -- Product Security -- Cloud PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 Red Hat Product Security contact: secalert () redhat com
Current thread:
- cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node 张开翔 (Jul 29)
- Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node cve-assign (Aug 03)
- <Possible follow-ups>
- Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Diogo Mónica (Sep 01)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Kurt Seifried (Sep 01)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Diogo Monica (Sep 01)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Kurt Seifried (Sep 01)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Diogo Mónica (Sep 02)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Kurt Seifried (Sep 02)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Diogo Mónica (Sep 05)
- Re: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node Kurt Seifried (Sep 01)