Denial of Service (DoS) Affecting xen package, versions [,4.13.1)


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.05% (17th percentile)

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  • Snyk IDSNYK-UNMANAGED-XEN-2383947
  • published26 Jan 2022
  • disclosed14 Apr 2020
  • creditUnknown

Introduced: 14 Apr 2020

CVE-2020-11742  (opens in a new tab)
CWE-400  (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 Denial of Service (DoS). 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.

References

CVSS Scores

version 3.1