Information Exposure Affecting xen package, versions <4.8.1-1+deb9u3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-XEN-5701031
- published15 Aug 2017
- disclosed15 Aug 2017
Introduced: 15 Aug 2017
CVE-2017-12855 (opens in a new tab)How to fix?
Upgrade Debian:13 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:13 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.
References
- https://security-tracker.debian.org/tracker/CVE-2017-12855
- http://www.debian.org/security/2017/dsa-3969
- https://support.citrix.com/article/CTX225941
- http://xenbits.xen.org/xsa/advisory-230.html
- http://www.securityfocus.com/bid/100341
- http://www.securitytracker.com/id/1039177
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-12855