Access Restriction Bypass Affecting xen package, versions <4.8.0-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN11-XEN-514602
- published23 Jan 2017
- disclosed23 Jan 2017
Introduced: 23 Jan 2017
CVE-2016-9386 (opens in a new tab)How to fix?
Upgrade Debian:11 xen to version 4.8.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.
References
- https://security-tracker.debian.org/tracker/CVE-2016-9386
- https://security.gentoo.org/glsa/201612-56
- https://support.citrix.com/article/CTX218775
- http://xenbits.xen.org/xsa/advisory-191.html
- http://www.securityfocus.com/bid/94471
- http://www.securitytracker.com/id/1037340
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-9386