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Exposure of Resource to Wrong Sphere The advisory has been revoked - it doesn't affect any version of package xen  (opens in a new tab)

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EPSS
0.35% (29th percentile)

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  • Snyk IDSNYK-UBUNTU2204-XEN-2786598
  • published19 Dec 2020
  • disclosed15 Dec 2020
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Introduced: 15 Dec 2020

CVE-2020-29481  (opens in a new tab)
CWE-668  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:22.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Ubuntu.

An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/<domid> are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.