Access Restriction Bypass Affecting xen package, versions <4.7.1-r1


0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.06% (25th percentile)
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NVD
7.8 high

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  • Snyk ID SNYK-ALPINE315-XEN-1929258
  • published 21 Jul 2020
  • disclosed 23 Jan 2017

How to fix?

Upgrade Alpine:3.15 xen to version 4.7.1-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:3.15 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.