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...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-1062
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1532545
TreeView+ depends on / blocked
 
Reported: 2018-02-28 06:31 UTC by Doran Moppert
Modified: 2021-02-17 00:44 UTC (History)
18 users (show)

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.
Clone Of:
Environment:
Last Closed: 2018-03-06 05:56:42 UTC
Embargoed:

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Description Doran Moppert 2018-02-28 06:31:28 UTC 
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 06:31:34 UTC 
Acknowledgments:

Name: Idan Shaby (Red Hat)
Comment 2 Doran Moppert 2018-03-06 05:44:29 UTC 
External References:

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