Resource Exhaustion Affecting xen package, versions <4.11.1~pre.20180911.5acdd26fdc+dfsg-2


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.05% (22nd percentile)

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  • Snyk IDSNYK-DEBIAN11-XEN-518249
  • published22 Aug 2018
  • disclosed17 Aug 2018

Introduced: 17 Aug 2018

CVE-2018-15470  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Debian:11 xen to version 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

An issue was discovered in Xen through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.