Access Restriction Bypass Affecting xen package, versions <4.7.0-r1
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-ALPINE316-XEN-2844919
- published21 Jul 2020
- disclosed21 Sept 2016
Introduced: 21 Sep 2016
CVE-2016-7092 (opens in a new tab)How to fix?
Upgrade Alpine:3.16 xen to version 4.7.0-r1 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 Alpine.
See How to fix? for Alpine:3.16 relevant fixed versions and status.
The get_page_from_l3e function in arch/x86/mm.c in Xen allows local 32-bit PV guest OS administrators to gain host OS privileges via vectors related to L3 recursive pagetables.
References
- http://www.securityfocus.com/bid/92862
- http://support.citrix.com/article/CTX216071
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://xenbits.xen.org/xsa/advisory-185.html
- http://xenbits.xen.org/xsa/xsa185.patch
- http://www.debian.org/security/2016/dsa-3663
- https://security.gentoo.org/glsa/201611-09
- http://www.securitytracker.com/id/1036751