Improper Validation of Array Index Affecting xen package, versions <4.8.1-1
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-DEBIAN11-XEN-519347
- published4 Apr 2017
- disclosed4 Apr 2017
Introduced: 4 Apr 2017
CVE-2017-7228 (opens in a new tab)How to fix?
Upgrade Debian:11 xen to version 4.8.1-1 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.
An issue (known as XSA-212) was discovered in Xen, with fixes available for 4.8.x, 4.7.x, 4.6.x, 4.5.x, and 4.4.x. The earlier XSA-29 fix introduced an insufficient check on XENMEM_exchange input, allowing the caller to drive hypervisor memory accesses outside of the guest provided input/output arrays.
References
- https://security-tracker.debian.org/tracker/CVE-2017-7228
- https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-029-2017.txt
- http://xenbits.xen.org/xsa/advisory-212.html
- http://www.debian.org/security/2017/dsa-3847
- https://www.exploit-db.com/exploits/41870/
- https://googleprojectzero.blogspot.com/2017/04/pandavirtualization-exploiting-xen.html
- http://openwall.com/lists/oss-security/2017/04/04/3
- http://www.securityfocus.com/bid/97375
- http://www.securitytracker.com/id/1038223
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-7228