<p>Upgrade <code>Alpine:3.20</code> <code>xen</code> to version 4.15.0-r2 or higher.</p>

Improper Privilege Management Affecting xen package, versions <4.15.0-r2

Threat Intelligence

0.05% (16^th percentile)

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Snyk ID SNYK-ALPINE320-XEN-7012470
published 23 May 2024
disclosed 27 Aug 2021

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Introduced: 27 Aug 2021

CVE-2021-28697 Open this link in a new tab CWE-269 Open this link in a new tab

How to fix?

Upgrade Alpine:3.20 xen to version 4.15.0-r2 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:3.20 relevant fixed versions and status.

grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.

References

CVSS Scores

version 3.1

Attack Vector (AV)

Local
Attack Complexity (AC)

Low
Privileges Required (PR)

Low
User Interaction (UI)

None

Scope (S)

Unchanged

Confidentiality (C)

High
Integrity (I)

High
Availability (A)

High