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Vulnerability · Published Dec 15, 2020 · Assigned by mitre

CVE-2020-29481

High 8.8

In plain English

A high-severity security flaw in the xen package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)8.8High
Exploit odds (30 days)0.4%top 71.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.14.1-r0ALPINE-CVE-2020-29481
Alpine:v3.21xen4.14.1-r0ALPINE-CVE-2020-29481
Alpine:v3.22xen4.14.1-r0ALPINE-CVE-2020-29481
Alpine:v3.23xen4.14.1-r0ALPINE-CVE-2020-29481
Alpine:v3.24xen4.14.1-r0ALPINE-CVE-2020-29481
Debian:12xen4.14.0+88-g1d1d1f5391-1DEBIAN-CVE-2020-29481
Debian:13xen4.14.0+88-g1d1d1f5391-1DEBIAN-CVE-2020-29481
Debian:14xen4.14.0+88-g1d1d1f5391-1DEBIAN-CVE-2020-29481

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References