Date: Thu, 1 Sep 2016 16:17:52 -0700 From: Diogo Mónica <diogo.monica@...ker.com> To: oss-security@...ts.openwall.com Subject: Re: cve request: docker swarmkit Dos occurs by repeatly joining and quitting swam cluster as a node 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 We believe this not a real issue, and would like to have the CVE rescinded.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. Thank you, -- Diogo Mónica
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