OSSN-0084: Data retained after deletion of a ScaleIO volume¶

Summary¶

Certain storage volume configurations allow newly created volumes to contain previous data. This could lead to leakage of sensitive information between tenants.

Affected Services / Software¶

Cinder releases up to and including Queens with ScaleIO volumes using thin volumes and zero padding.

Discussion¶

Using both thin volumes and zero padding does not ensure data contained in a volume is actually deleted. The default volume provisioning rule is set to thick so most installations are likely not affected. Operators can check their configuration in cinder.conf or check for zero padding with this command scli --query_all.

Recommended Actions¶

Operators can use the following two workarounds, until the release of Rocky (planned 30th August 2018) which resolves the issue.

Swap to thin volumes.

Ensure ScaleIO storage pools use zero-padding with:

scli --modify_zero_padding_policy
(((--protection_domain_id <ID> |
--protection_domain_name <NAME>)
--storage_pool_name <NAME>) | --storage_pool_id <ID>)
(--enable_zero_padding | --disable_zero_padding)

Contacts / References¶

Author: Nick Tait

This OSSN : https://docs.openstack.org/security-notes/OSSN-0084.html
Original LaunchPad Bug : https://bugs.launchpad.net/ossn/+bug/1699573
Mailing List : tag on openstack-dev@lists.openstack.org
OpenStack Security Project : https://launchpad.net/~openstack-ossg

OSSN-0084: Data retained after deletion of a ScaleIO volume