Log in Start free

Vulnerability · Published Apr 14, 2020 · Assigned by mitre

CVE-2020-11743

Medium 5.5

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 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.5%top 55.2% 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 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.13.0-r3ALPINE-CVE-2020-11743
Alpine:v3.21xen4.13.0-r3ALPINE-CVE-2020-11743
Alpine:v3.22xen4.13.0-r3ALPINE-CVE-2020-11743
Alpine:v3.23xen4.13.0-r3ALPINE-CVE-2020-11743
Alpine:v3.24xen4.13.0-r3ALPINE-CVE-2020-11743
Debian:12xen4.11.4-1DEBIAN-CVE-2020-11743
Debian:13xen4.11.4-1DEBIAN-CVE-2020-11743
Debian:14xen4.11.4-1DEBIAN-CVE-2020-11743

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References