Bug 1897145 (CVE-2020-28368) - CVE-2020-28368 xen: information leak via power sidechannel
Summary: CVE-2020-28368 xen: information leak via power sidechannel
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-28368
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1897146
Blocks: 1897147
TreeView+ depends on / blocked
 
Reported: 2020-11-12 12:44 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 18:55 UTC (History)
25 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in Xen where access to power/energy monitoring interfaces was not properly restricted to privileged software. This flaw allows an unprivileged guest administrator to create covert channels and infer the operations or data used by other contexts within the system, such as AES keys or additional sensitive information. The highest threat from this vulnerability is to confidentiality.
Clone Of:
Environment:
Last Closed: 2020-11-12 17:28:34 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-11-12 12:44:20 UTC 
Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from outside the guest) via a side-channel attack on a power/energy monitoring interface, aka a "Platypus" attack. NOTE: there is only one logically independent fix: to change the access control for each such interface in Xen.
Comment 1 Guilherme de Almeida Suckevicz 2020-11-12 12:44:48 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1897146]
Comment 2 Mauro Matteo Cascella 2020-11-12 16:38:37 UTC 
Acknowledgments:

Name: the Xen project
Comment 3 Mauro Matteo Cascella 2020-11-12 16:39:13 UTC 
External References:

https://xenbits.xen.org/xsa/advisory-351.html
Comment 4 Mauro Matteo Cascella 2020-11-12 16:42:18 UTC 
Statement:

This flaw has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in  the Extended Life Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Comment 5 Mauro Matteo Cascella 2020-11-12 16:57:30 UTC 
Upstream fixes:

---
arm:        https://xenbits.xen.org/xsa/xsa351-arm.patch
arm-4.11:   https://xenbits.xen.org/xsa/xsa351-arm-4.11.patch
---
x86-4.11-1: https://xenbits.xen.org/xsa/xsa351-x86-4.11-1.patch
x86-4.11-2: https://xenbits.xen.org/xsa/xsa351-x86-4.11-2.patch
---
x86-4.12-1: https://xenbits.xen.org/xsa/xsa351-x86-4.12-1.patch
x86-4.12-2: https://xenbits.xen.org/xsa/xsa351-x86-4.12-2.patch
---
x86-4.13-1: https://xenbits.xen.org/xsa/xsa351-x86-4.13-1.patch
x86-4.13-2: https://xenbits.xen.org/xsa/xsa351-x86-4.13-2.patch
---
x86-4.14-1: https://xenbits.xen.org/xsa/xsa351-x86-4.14-1.patch
x86-4.14-2: https://xenbits.xen.org/xsa/xsa351-x86-4.14-2.patch
Comment 6 Mauro Matteo Cascella 2020-11-12 17:00:44 UTC 
Mitigation:

There is no known mitigation for this flaw apart from applying the patch.
Comment 7 Product Security DevOps Team 2020-11-12 17:28:34 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-28368
Note You need to log in before you can comment on or make changes to this bug.