Date: Tue, 24 Mar 2015 03:36:10 -0400 (EDT) From: cve-assign@...re.org To: gmollett@...hat.com Cc: cve-assign@...re.org, oss-security@...ts.openwall.com Subject: Re: CVE request for OpenStack Compute (nova) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > 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? - -- CVE assignment team, MITRE CVE Numbering Authority M/S M300 202 Burlington Road, Bedford, MA 01730 USA [ PGP key available through http://cve.mitre.org/cve/request_id.html ] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (SunOS) iQEcBAEBAgAGBQJVERM0AAoJEKllVAevmvmsbBgIAMGBnjBiFxT9hfdSED6p/WD1 2kh8GJq8sfECGAS7p7vLcjmqQXKIwJWRD9z974OtRuFSrMcS59Lon/3wVOMO8SGI RC/RtM2sG41WyhcM3Io5rlFIQ4ligNTwhd88+1wPRH5CGAJfK9X2HrCew95WR2m+ bx4bSaNvoolbZMvX11YaQHqX/5HdX1qispLdduKjTEI506YLLP8IAyR8gX1o0cOG cU5gMkd0zbVvh67ZdCkIvsIkRIO1ZJC8kStzPJVTDm1+A8GxvBs7/M6nmHG6T4ji IFD2w350UT2iZWBWrt6KRfvTDeqAmik9+3u424oFiHtWaMyz+FPMTIO9J8PIBHg= =YcdN -----END PGP SIGNATURE-----
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