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Race Condition Affecting firefox package, versions <95.0-1

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required

    Threat Intelligence

    EPSS 0.12% (46th percentile)
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NVD
4.3 medium
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Red Hat
7.5 high
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SUSE
7.5 high

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  • Snyk ID SNYK-DEBIANUNSTABLE-FIREFOX-2311974
  • published 8 Dec 2021
  • disclosed 8 Dec 2021
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Introduced: 8 Dec 2021

CVE-2021-43538 Open this link in a new tab
CWE-362 Open this link in a new tab

How to fix?

Upgrade Debian:unstable firefox to version 95.0-1 or higher.

NVD Description

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

By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.