Improper Restriction of Rendered UI Layers or Frames Affecting firefox package, versions <0:91.4.0-1.el8_5


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.69% (81st percentile)

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  • Snyk IDSNYK-RHEL8-FIREFOX-4183508
  • published8 Dec 2021
  • disclosed7 Dec 2021

Introduced: 7 Dec 2021

CVE-2021-43538  (opens in a new tab)
CWE-1021  (opens in a new tab)

How to fix?

Upgrade RHEL:8 firefox to version 0:91.4.0-1.el8_5 or higher.
This issue was patched in RHSA-2021:5013.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by RHEL. See How to fix? for RHEL:8 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