RHSA-2020:1338 - Security Advisory

Topic

An update for firefox is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Critical. 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 68.6.1 ESR.

Security Fix(es):

• Mozilla: Use-after-free while running the nsDocShell destructor (CVE-2020-6819)
• Mozilla: Use-after-free when handling a ReadableStream (CVE-2020-6820)

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 Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le

Fixes

• BZ - 1820869 - CVE-2020-6819 Mozilla: Use-after-free while running the nsDocShell destructor
• BZ - 1820878 - CVE-2020-6820 Mozilla: Use-after-free when handling a ReadableStream

CVEs

• CVE-2020-6819
• CVE-2020-6820

References

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