Inclusion of Functionality from Untrusted Control Sphere Affecting firefox package, versions <0:91.3.0-1.el8_4


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.7% (81st percentile)

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  • Snyk IDSNYK-CENTOS8-FIREFOX-2125737
  • published3 Nov 2021
  • disclosed2 Nov 2021

Introduced: 2 Nov 2021

CVE-2021-38507  (opens in a new tab)
CWE-829  (opens in a new tab)

How to fix?

Upgrade Centos:8 firefox to version 0:91.3.0-1.el8_4 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 Centos. See How to fix? for Centos:8 relevant fixed versions and status.

The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS Scores

version 3.1