RHSA-2020:5563 - 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 78.6.0 ESR.

Security Fix(es):

• chromium-browser: Uninitialized Use in V8 (CVE-2020-16042)
• Mozilla: Heap buffer overflow in WebGL (CVE-2020-26971)
• Mozilla: CSS Sanitizer performed incorrect sanitization (CVE-2020-26973)
• Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free (CVE-2020-26974)
• Mozilla: Memory safety bugs fixed in Firefox 84 and Firefox ESR 78.6 (CVE-2020-35113)
• Mozilla: Internal network hosts could have been probed by a malicious webpage (CVE-2020-26978)
• Mozilla: The proxy.onRequest API did not catch view-source URLs (CVE-2020-35111)

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 - 1904515 - CVE-2020-16042 chromium-browser: Uninitialized Use in V8
• BZ - 1908022 - CVE-2020-26971 Mozilla: Heap buffer overflow in WebGL
• BZ - 1908023 - CVE-2020-26973 Mozilla: CSS Sanitizer performed incorrect sanitization
• BZ - 1908024 - CVE-2020-26974 Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free
• BZ - 1908025 - CVE-2020-26978 Mozilla: Internal network hosts could have been probed by a malicious webpage
• BZ - 1908027 - CVE-2020-35111 Mozilla: The proxy.onRequest API did not catch view-source URLs
• BZ - 1908029 - CVE-2020-35113 Mozilla: Memory safety bugs fixed in Firefox 84 and Firefox ESR 78.6

CVEs

• CVE-2020-16042
• CVE-2020-26971
• CVE-2020-26973
• CVE-2020-26974
• CVE-2020-26978
• CVE-2020-35111
• CVE-2020-35113

References

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