Auth bypass in Xen
CVE-2020-28368
Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from outside the guest) via a side-channel attack on a power/energy monitoring interface, aka a "Platypus" attack. NOTE: there is only one logically independent fix: to change the access control for each such interface in Xen.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Xen
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 32
Weakness classification (CWE)
References
- xenbits.xen.org/xsa/advisory-351.html (Patch, Vendor Advisory)
- platypusattack.com (Third Party Advisory)
- www.zdnet.com/article/new-platypus-attack-can-steal-data-from-intel-cpus/ (Third Party Advisory)
- xenbits.xen.org/xsa/advisory-351.html (Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.openwall.com/lists/oss-security/2020/11/26/1 (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2020/dsa-4804 (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-28368?
- CVE-2020-28368 is a medium-severity vulnerability in Xen, classified under Missing Authorization. CVSS score: 4.4/10. Published 2020-11-10.
- How severe is CVE-2020-28368?
- Medium severity. CVSS v3 base score is 4.4 out of 10.