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Use After Free Affecting electron package, versions >=11.0.0-beta.1 <11.4.0 <10.4.1

0.0
high

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Mature
    EPSS 1.17% (85th percentile)
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NVD
8.8 high

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  • Snyk ID SNYK-JS-ELECTRON-1085705
  • published 16 Mar 2021
  • disclosed 15 Mar 2021
  • credit Unknown
Report a new vulnerability Found a mistake?

Introduced: 15 Mar 2021

CVE-2021-21193 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade electron to version 11.4.0, 10.4.1 or higher.

Overview

electron is a framework which lets you write cross-platform desktop applications using JavaScript, HTML and CSS.

Affected versions of this package are vulnerable to Use After Free. When a LayoutInline is removed, LineBoxList::DirtyLinesFromChangedChild tries to mark affected RootInlineBox dirty.

When the |LayoutInline| to be removed is culled, it tries to find the RootInlineBox from its previous siblings, then look for its previous and next RootInlineBoxes.

Occasionally, the next next line of the previous sibling is wrapped at the LayoutInline, and that its LineBreakObj() holds the reference to the LayoutInline. This patch marks such RootInlineBox dirty.