Date: Tue, 24 Mar 2015 20:58:57 +1100 From: Garth Mollett <gmollett@...hat.com> To: cve-assign@...re.org CC: oss-security@...ts.openwall.com Subject: Re: CVE request for OpenStack Compute (nova) I am not a member of OpenStack VMT, so this is just my opinion, but I think the CVE should probably apply to all versions. It's worth noting that the C1 rating mentioned in the launchpad bug is referring to this: https://wiki.openstack.org/wiki/Vulnerability_Management#Incident_report_taxonomy Which is "Not considered a practical vulnerability (but some people might assign a CVE for it)". So it's not necessarily saying there is no vulnerability/CVE needed for other versions. Just that it's not considered serious enough for an OSSA, by my reading. On 03/24/2015 06:36 PM, cve-assign@...re.org wrote: >> https://bugs.launchpad.net/nova/+bug/1419577 > > Use CVE-2015-2687 for this issue with an unintended loss of access > control after a failed live migration. > > For purposes of CVE, we typically don't think of vulnerabilities in > the way expressed in > https://bugs.launchpad.net/nova/+bug/1419577/comments/4 "without a way > to make the migration process fail, this is a bug with security > consequence, but not a vulnerability." In other words, for a CVE, the > attacker can be a person who wishes to have an unauthorized volume > attachment after the bug is triggered. The attacker does not need to > be a person who has determined a reproducible way to trigger the bug. > >> if live-migration is executed while process keep using big size of >> memory by benchmark tool or something like that in VM instance and >> then the waiting status of live-migration could be persisted, >> eventually live-migration will be failed. > > We think that nobody commented on whether this is a feasible way to > actively trigger the bug. > >> you're suggesting potential exploits involving > >> 1. disconnecting physical network interfaces > > We think the intended security property of this OpenStack product is: > "if network connectivity is disrupted by anyone (authorized or not) > during a live migration, then access control for volumes still must > match users' expectations afterward." > > It is conceivable that the intended security property of this > OpenStack product is instead "if network connectivity is disrupted > during a live migration, then access control for volumes afterward is > undefined." In this case, maybe you mean that the CVE should apply > only to Havana, because the only relevant root cause is a Havana bug. > The reasoning in that scenario would be: > > 1 - a Havana bug (e.g., 1362916 or possibly the combination of > 1362916 and a second bug) makes it possible to force a failure > of a live migration > > 2 - this was not previously considered a vulnerability > > 3 - however, the relevant OpenStack product has a required security > property of "There must not be any software bugs that allow > live-migration failure attacks, because these attacks are > equivalent to attacks against volume access control." > > 4 - therefore, the bug in item 1 is promoted to a vulnerability, > and is the bug directly associated with CVE-2015-2687 > > 5 - consequently, CVE-2015-2687 would not be used in an advisory > because Havana is unsupported by the OpenStack VMT > > So, does the OpenStack VMT have a position on whether to choose this > latter scenario? In other words, if live migration fails because of a > disconnected physical network interface, is access control for volumes > intentionally undefined afterward? > > Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)
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