CVE-2015-8555: Infoleak
First published: Wed Apr 13 2016(Updated: )
Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| XenServer | =6.0 | |
| Xen XAPI | =4.3.0 | |
| Xen XAPI | =4.3.1 | |
| Xen XAPI | =4.3.2 | |
| Xen XAPI | =4.3.3 | |
| Xen XAPI | =4.3.4 | |
| Xen XAPI | =4.4.0 | |
| Xen XAPI | =4.4.1 | |
| Xen XAPI | =4.4.2 | |
| Xen XAPI | =4.4.3 | |
| Xen XAPI | =4.4.4 | |
| Xen XAPI | =4.5.0 | |
| Xen XAPI | =4.5.1 | |
| Xen XAPI | =4.5.2 | |
| Xen XAPI | =4.5.3 | |
| Xen XAPI | =4.6.0 | |
| Xen XAPI | =4.6.1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://support.citrix.com/article/CTX203879
- http://www.debian.org/security/2016/dsa-3519
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/79543
- http://www.securitytracker.com/id/1034477
- http://xenbits.xen.org/xsa/advisory-165.html
- https://security.gentoo.org/glsa/201604-03
Frequently Asked Questions
What is the severity of CVE-2015-8555?
CVE-2015-8555 has a medium severity rating that indicates potential risks of information disclosure.
How do I fix CVE-2015-8555?
To fix CVE-2015-8555, the affected version of Xen should be updated to a patched release that properly initializes the FPU stack and XMM registers.
Who is affected by CVE-2015-8555?
CVE-2015-8555 affects installations of Xen 4.3.x through 4.6.x, including various XenServer versions.
What does CVE-2015-8555 exploit?
CVE-2015-8555 exploits improper initialization of the FPU stack and XMM registers, allowing local guest domains to access sensitive information from other guest domains.
Is CVE-2015-8555 still a concern?
While CVE-2015-8555 has been addressed in later versions, systems running outdated versions of Xen remain at risk.
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/remedy
- agent/references
- agent/last-modified-date
- agent/severity
- agent/weakness
- agent/author
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/citrix
- canonical/xenserver
- version/xenserver/6.0
- vendor/xen
- canonical/xen xapi
- version/xen xapi/4.3.0
- version/xen xapi/4.3.1
- version/xen xapi/4.3.2
- version/xen xapi/4.3.3
- version/xen xapi/4.3.4
- version/xen xapi/4.4.0
- version/xen xapi/4.4.1
- version/xen xapi/4.4.2
- version/xen xapi/4.4.3
- version/xen xapi/4.4.4
- version/xen xapi/4.5.0
- version/xen xapi/4.5.1
- version/xen xapi/4.5.2
- version/xen xapi/4.5.3
- version/xen xapi/4.6.0
- version/xen xapi/4.6.1