RHSA-2021:3756 - Security Advisory

Topic

An update for firefox is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

This update upgrades Firefox to version 91.2.0 ESR.

Security Fix(es):

• Mozilla: Use-after-free in MessageTask (CVE-2021-38496)
• Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2 (CVE-2021-38500)
• Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)
• rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)
• Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)
• Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

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.

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.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.2 x86_64
• Red Hat Enterprise Linux Server - AUS 8.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.2 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.2 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.2 x86_64

Fixes

• BZ - 1990342 - CVE-2021-32810 rust-crossbeam-deque: race condition may lead to double free
• BZ - 2011097 - CVE-2021-38496 Mozilla: Use-after-free in MessageTask
• BZ - 2011098 - CVE-2021-38497 Mozilla: Validation message could have been overlaid on another origin
• BZ - 2011099 - CVE-2021-38498 Mozilla: Use-after-free of nsLanguageAtomService object
• BZ - 2011100 - CVE-2021-38500 Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2
• BZ - 2011101 - CVE-2021-38501 Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2

CVEs

• CVE-2021-32810
• CVE-2021-38496
• CVE-2021-38497
• CVE-2021-38498
• CVE-2021-38500
• CVE-2021-38501

References

• https://access.redhat.com/security/updates/classification/#important