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Debian: CVE-2020-29481: xen -- security update

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Debian: CVE-2020-29481: xen -- security update

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
12/15/2020
Created
12/17/2020
Added
12/17/2020
Modified
12/21/2020

Description

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.

Solution(s)

  • debian-upgrade-xen

References

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