Race Condition Affecting firefox-esr package, versions <91.4.1esr-1~deb11u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.69% (81st percentile)

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  • Snyk IDSNYK-DEBIAN11-FIREFOXESR-2312003
  • published8 Dec 2021
  • disclosed8 Dec 2021

Introduced: 8 Dec 2021

CVE-2021-43538  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Debian:11 firefox-esr to version 91.4.1esr-1~deb11u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Debian. See How to fix? for Debian:11 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.

CVSS Scores

version 3.1