Improper Handling of Exceptional Conditions Affecting xen package, versions [,4.13.1)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.08% (38th percentile)

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  • Snyk IDSNYK-UNMANAGED-XEN-2383695
  • published26 Jan 2022
  • disclosed14 Apr 2020
  • creditUnknown

Introduced: 14 Apr 2020

CVE-2020-11743  (opens in a new tab)
CWE-755  (opens in a new tab)

How to fix?

Upgrade xen to version 4.13.1 or higher.

Overview

Affected versions of this package are vulnerable to Improper Handling of Exceptional Conditions. 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.

References

CVSS Scores

version 3.1