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Red Hat: RHSA-2021-0288-01 Critical: Firefox Cross-Origin Issue

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Calendar Grey January 27, 2021
Scroller Redhat
The latest FireFox upgrade for Red Hat Enterprise Linux 8 resolves several security vulnerabilities classified as important. Update it immediately!
An update for firefox is now available for Red Hat Enterprise Linux 8

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 78.7.0 ESR.
Security Fix(es):
* Mozilla: Cross-origin information leakage via redirected PDF requests (CVE-2021-23953)
* Mozilla: Type confusion when using logical assignment operators in JavaScript switch statements (CVE-2021-23954)
* Mozilla: Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7 (CVE-2021-23964)
* Mozilla: HTTPS pages could have been intercepted by a registered service worker when they should not have been (CVE-2020-26976)
* Mozilla: Use-after-poison for incorrectly redeclared JavaScript variables during GC (CVE-2021-23960)
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 Red Hat security fix important firefox red hat enterprise memory safety firefox update important update JavaScript web browser issue cross-origin leakage service worker issue

References

https://access.redhat.com/security/cve/CVE-2020-26976 https://access.redhat.com/security/cve/CVE-2021-23953 https://access.redhat.com/security/cve/CVE-2021-23954 https://access.redhat.com/security/cve/CVE-2021-23960 https://access.redhat.com/security/cve/CVE-2021-23964 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux AppStream (v. 8):
Source: firefox-78.7.0-2.el8_3.src.rpm
aarch64: firefox-78.7.0-2.el8_3.aarch64.rpm firefox-debuginfo-78.7.0-2.el8_3.aarch64.rpm firefox-debugsource-78.7.0-2.el8_3.aarch64.rpm
ppc64le: firefox-78.7.0-2.el8_3.ppc64le.rpm firefox-debuginfo-78.7.0-2.el8_3.ppc64le.rpm firefox-debugsource-78.7.0-2.el8_3.ppc64le.rpm
s390x: firefox-78.7.0-2.el8_3.s390x.rpm firefox-debuginfo-78.7.0-2.el8_3.s390x.rpm firefox-debugsource-78.7.0-2.el8_3.s390x.rpm
x86_64: firefox-78.7.0-2.el8_3.x86_64.rpm firefox-debuginfo-78.7.0-2.el8_3.x86_64.rpm firefox-debugsource-78.7.0-2.el8_3.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-2021:0288-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0288
Issue date: 2021-01-27

Topic

An update for firefox is now available for Red Hat Enterprise Linux 8.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 Red Hat security fix important firefox red hat enterprise memory safety firefox update important update JavaScript web browser issue cross-origin leakage service worker issue

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1920646 - CVE-2021-23953 Mozilla: Cross-origin information leakage via redirected PDF requests

1920648 - CVE-2021-23954 Mozilla: Type confusion when using logical assignment operators in JavaScript switch statements

1920649 - CVE-2020-26976 Mozilla: HTTPS pages could have been intercepted by a registered service worker when they should not have been

1920650 - CVE-2021-23960 Mozilla: Use-after-poison for incorrectly redeclared JavaScript variables during GC

1920651 - CVE-2021-23964 Mozilla: Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7

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