Information Exposure Affecting xen package, versions <4.9.0-r1


0.0
medium

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Confidentiality High

    Threat Intelligence

    EPSS 0.06% (24th percentile)
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NVD
6.5 medium

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  • Snyk ID SNYK-ALPINE314-XEN-1308668
  • published 21 Jul 2020
  • disclosed 15 Aug 2017

How to fix?

Upgrade Alpine:3.14 xen to version 4.9.0-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:3.14 relevant fixed versions and status.

Xen maintains the GTF{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.