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Vulnerability · Published Apr 14, 2020 · Assigned by mitre

CVE-2020-11742

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 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 64.7% 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 bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.13.0-r3ALPINE-CVE-2020-11742
Alpine:v3.21xen4.13.0-r3ALPINE-CVE-2020-11742
Alpine:v3.22xen4.13.0-r3ALPINE-CVE-2020-11742
Alpine:v3.23xen4.13.0-r3ALPINE-CVE-2020-11742
Alpine:v3.24xen4.13.0-r3ALPINE-CVE-2020-11742
Debian:12xen4.11.4-1DEBIAN-CVE-2020-11742
Debian:13xen4.11.4-1DEBIAN-CVE-2020-11742
Debian:14xen4.11.4-1DEBIAN-CVE-2020-11742

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References