Bug 1549944 – CVE-2018-1062 ovirt-engine: When Wipe After Delete (WAD) and Enable Discard are both enabled for a VM disk, discarded data might not be wiped after the disk is removed.

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Bug 1549944 - (CVE-2018-1062) CVE-2018-1062 ovirt-engine: When Wipe After Delete (WAD) and Enable Discard are both enabled for a VM disk, discarded data might not be wiped after the disk is removed.

Summary:	CVE-2018-1062 ovirt-engine: When Wipe After Delete (WAD) and Enable Discard a...

Status:	CLOSED ERRATA

Aliases:	CVE-2018-1062

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20180306,reported=2...
Keywords:	Security

Depends On:
Blocks:	1532545
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Reported:	2018-02-28 01:31 EST by Doran Moppert
Modified:	2018-03-13 13:33 EDT (History)
CC List:	19 users (show)

See Also:
Fixed In Version:	ovirt-engine 4.1.9
Doc Type:	If docs needed, set a value
Doc Text:	It was discovered that the combination of Enable Discard and Wipe After Delete flags for VM disks managed by oVirt, could cause a disk to be incompletely zeroed when removed from a VM. If the same storage blocks happen to be later allocated to a new disk attached to another VM, potentially sensitive data could be revealed to privileged users of that VM.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-03-06 00:56:42 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Doran Moppert 2018-02-28 01:31:28 EST

In oVirt 4.1, the Enable Discard feature was introduced.  This was found to be unreliable in combination with Wipe After Delete (WAD), in that a VM Disk with both flags configured could be removed from a VM and not have all of its blocks wiped.  If the same storage pages were then assigned to another Virtual Machine, potentially sensitive data could be read from those pages instead of zeroes.

Comment 1 Doran Moppert 2018-02-28 01:31:34 EST

Acknowledgments:

Name: Idan Shaby (Red Hat)

Comment 2 Doran Moppert 2018-03-06 00:44:29 EST

External References:

https://gerrit.ovirt.org/#/c/84875
https://gerrit.ovirt.org/#/c/84861

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