Incorrect Conversion between Numeric Types Affecting xen package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-DEBIAN10-XEN-3092718
  • published2 Nov 2022
  • disclosed1 Nov 2022

Introduced: 1 Nov 2022

CVE-2022-42324  (opens in a new tab)
CWE-681  (opens in a new tab)

How to fix?

There is no fixed version for Debian:10 xen.

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:10 relevant fixed versions and status.

Oxenstored 32->31 bit integer truncation issues Integers in Ocaml are 63 or 31 bits of signed precision. The Ocaml Xenbus library takes a C uint32_t out of the ring and casts it directly to an Ocaml integer. In 64-bit Ocaml builds this is fine, but in 32-bit builds, it truncates off the most significant bit, and then creates unsigned/signed confusion in the remainder. This in turn can feed a negative value into logic not expecting a negative value, resulting in unexpected exceptions being thrown. The unexpected exception is not handled suitably, creating a busy-loop trying (and failing) to take the bad packet out of the xenstore ring.

CVSS Scores

version 3.1