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Red Hat 8.2: RHSA-2021-4605 Important Firefox Security Update

red hat
Calendar Grey November 10, 2021
Dist Redhat Esm H88
Essential Firefox security patch for Red Hat Enterprise Linux 8.2 tackling significant vulnerabilities and boosting user safety.
An update for firefox is now available for Red Hat Enterprise Linux 8.2 Extended Update Support

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the update, Firefox must be restarted for the changes to take effect.

Summary

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.
This update upgrades Firefox to version 91.3.0 ESR.
Security Fix(es):
* Mozilla: Use-after-free in HTTP2 Session object
* Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3
* Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)
* Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)
* Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning (CVE-2021-38506)
* Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports (CVE-2021-38507)
* Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing (CVE-2021-38508)
* Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Topics%20covered

Topics Covered

security advisory security fix Red Hat Enterprise Linux firefox security impact web browser important update

References

https://access.redhat.com/security/cve/CVE-2021-38503 https://access.redhat.com/security/cve/CVE-2021-38504 https://access.redhat.com/security/cve/CVE-2021-38506 https://access.redhat.com/security/cve/CVE-2021-38507 https://access.redhat.com/security/cve/CVE-2021-38508 https://access.redhat.com/security/cve/CVE-2021-38509 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux AppStream EUS (v. 8.2):
Source: firefox-91.3.0-1.el8_2.src.rpm
aarch64: firefox-91.3.0-1.el8_2.aarch64.rpm firefox-debuginfo-91.3.0-1.el8_2.aarch64.rpm firefox-debugsource-91.3.0-1.el8_2.aarch64.rpm
ppc64le: firefox-91.3.0-1.el8_2.ppc64le.rpm firefox-debuginfo-91.3.0-1.el8_2.ppc64le.rpm firefox-debugsource-91.3.0-1.el8_2.ppc64le.rpm
s390x: firefox-91.3.0-1.el8_2.s390x.rpm firefox-debuginfo-91.3.0-1.el8_2.s390x.rpm firefox-debugsource-91.3.0-1.el8_2.s390x.rpm
x86_64: firefox-91.3.0-1.el8_2.x86_64.rpm firefox-debuginfo-91.3.0-1.el8_2.x86_64.rpm firefox-debugsource-91.3.0-1.el8_2.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:4605-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4605
Issue date: 2021-11-10

Topic

An update for firefox is now available for Red Hat Enterprise Linux 8.2Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security fix Red Hat Enterprise Linux firefox security impact web browser important update

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream EUS (v. 8.2) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

2019621 - CVE-2021-38503 Mozilla: iframe sandbox rules did not apply to XSLT stylesheets

2019622 - CVE-2021-38504 Mozilla: Use-after-free in file picker dialog

2019624 - CVE-2021-38506 Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning

2019625 - CVE-2021-38507 Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports

2019626 - Mozilla: Use-after-free in HTTP2 Session object

2019627 - CVE-2021-38508 Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing

2019628 - CVE-2021-38509 Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain

2019630 - Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

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