Improper Restriction of Rendered UI Layers or Frames Affecting firefox package, versions <0:91.3.0-1.el8_4


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.88% (84th percentile)

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  • Snyk IDSNYK-RHEL8-FIREFOX-4160061
  • published3 Nov 2021
  • disclosed2 Nov 2021

Introduced: 2 Nov 2021

CVE-2021-38509  (opens in a new tab)
CWE-1021  (opens in a new tab)

How to fix?

Upgrade RHEL:8 firefox to version 0:91.3.0-1.el8_4 or higher.
This issue was patched in RHSA-2021:4123.

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.

Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS Scores

version 3.1