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Type Confusion Affecting wasmtime package, versions <0.30.0

0.0
medium

Snyk CVSS

    Attack Complexity High
    Availability High

    Threat Intelligence

    EPSS 0.05% (14th percentile)
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NVD
6.3 medium

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  • Snyk ID SNYK-RUST-WASMTIME-1592671
  • published 19 Sep 2021
  • disclosed 19 Sep 2021
  • credit alexcrichton
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Introduced: 19 Sep 2021

CVE-2021-39219 Open this link in a new tab
CWE-843 Open this link in a new tab

How to fix?

Upgrade wasmtime to version 0.30.0 or higher.

Overview

Affected versions of this package are vulnerable to Type Confusion in the safe Linker::func_* API. When one Engine is used to create the Linker and then a different Engine is used to create a Store, then the Linker is used to instantiate a module into that Store. Cross-Engine usage of functions is not supported in Wasmtime and this can result in type confusion of function pointers.