Improperly Implemented Security Check for Standard Affecting firefox package, versions <0:78.5.0-1.el8_3


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-RHEL8-FIREFOX-3924548
  • published26 Jul 2021
  • disclosed17 Nov 2020

Introduced: 17 Nov 2020

CVE-2020-26961  (opens in a new tab)
CWE-358  (opens in a new tab)

How to fix?

Upgrade RHEL:8 firefox to version 0:78.5.0-1.el8_3 or higher.
This issue was patched in RHSA-2020:5237.

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.

When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS Scores

version 3.1