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Vulnerability · Published Sep 23, 2020 · Assigned by mitre

CVE-2020-25599

High 7.0

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 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.0High
Exploit odds (30 days)0.3%top 78.8% 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. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.14.0-r1ALPINE-CVE-2020-25599
Alpine:v3.21xen4.14.0-r1ALPINE-CVE-2020-25599
Alpine:v3.22xen4.14.0-r1ALPINE-CVE-2020-25599
Alpine:v3.23xen4.14.0-r1ALPINE-CVE-2020-25599
Alpine:v3.24xen4.14.0-r1ALPINE-CVE-2020-25599
Debian:12xen4.14.0+80-gd101b417b7-1DEBIAN-CVE-2020-25599
Debian:13xen4.14.0+80-gd101b417b7-1DEBIAN-CVE-2020-25599
Debian:14xen4.14.0+80-gd101b417b7-1DEBIAN-CVE-2020-25599

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References