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Vulnerability · Published Dec 15, 2020 · Assigned by mitre

CVE-2020-29486

Medium 6.0

In plain English

A medium-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 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.0Medium
Exploit odds (30 days)0.4%top 64.4% 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. Nodes in xenstore have an ownership. In oxenstored, a owner could give a node away. However, node ownership has quota implications. Any guest can run another guest out of quota, or create an unbounded number of nodes owned by dom0, thus running xenstored out of memory A malicious guest administrator can cause a denial of service against a specific guest or against the whole host. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.14.1-r0ALPINE-CVE-2020-29486
Alpine:v3.21xen4.14.1-r0ALPINE-CVE-2020-29486
Alpine:v3.22xen4.14.1-r0ALPINE-CVE-2020-29486
Alpine:v3.23xen4.14.1-r0ALPINE-CVE-2020-29486
Alpine:v3.24xen4.14.1-r0ALPINE-CVE-2020-29486
Debian:12xen4.14.0+88-g1d1d1f5391-1DEBIAN-CVE-2020-29486
Debian:13xen4.14.0+88-g1d1d1f5391-1DEBIAN-CVE-2020-29486
Debian:14xen4.14.0+88-g1d1d1f5391-1DEBIAN-CVE-2020-29486

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References