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Information Exposure Affecting xen package, versions <4.8.1-1+deb9u3

Severity

 Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.06% (28th percentile)

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  • Snyk IDSNYK-DEBIAN11-XEN-518679
  • published15 Aug 2017
  • disclosed15 Aug 2017
Report a new vulnerability Found a mistake?

Introduced: 15 Aug 2017

CVE-2017-12855  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Debian:11 xen to version 4.8.1-1+deb9u3 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 Debian. See How to fix? for Debian:11 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.