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RedHat 8.1: RHSA-2021-0995-01 Important: Thunderbird DoS Threat

red hat
Calendar Grey March 25, 2021
Dist Redhat Esm H88
Immediate patch release for Thunderbird on Red Hat Enterprise Linux 8.1. Shield yourself from significant vulnerabilities today.
An update for thunderbird is now available for Red Hat Enterprise Linux 8.1 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

All running instances of Thunderbird must be restarted for the update to take effect.

Summary

Mozilla Thunderbird is a standalone mail and newsgroup client.
This update upgrades Thunderbird to version 78.9.0.
Security Fix(es):
* Mozilla: Texture upload into an unbound backing buffer resulted in an out-of-bound read (CVE-2021-23981)
* Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9 (CVE-2021-23987)
* Mozilla: Internal network hosts could have been probed by a malicious webpage (CVE-2021-23982)
* Mozilla: Malicious extensions could have spoofed popup information (CVE-2021-23984)
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 issue update red hat important thunderbird mail client

References

https://access.redhat.com/security/cve/CVE-2021-23981 https://access.redhat.com/security/cve/CVE-2021-23982 https://access.redhat.com/security/cve/CVE-2021-23984 https://access.redhat.com/security/cve/CVE-2021-23987 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux AppStream EUS (v. 8.1):
Source: thunderbird-78.9.0-3.el8_1.src.rpm
ppc64le: thunderbird-78.9.0-3.el8_1.ppc64le.rpm thunderbird-debuginfo-78.9.0-3.el8_1.ppc64le.rpm thunderbird-debugsource-78.9.0-3.el8_1.ppc64le.rpm
x86_64: thunderbird-78.9.0-3.el8_1.x86_64.rpm thunderbird-debuginfo-78.9.0-3.el8_1.x86_64.rpm thunderbird-debugsource-78.9.0-3.el8_1.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-2021:0995-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0995
Issue date: 2021-03-25

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 8.1Extended 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 issue update red hat important thunderbird mail client

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream EUS (v. 8.1) - ppc64le, x86_64

Bugs Fixed

1942783 - CVE-2021-23981 Mozilla: Texture upload into an unbound backing buffer resulted in an out-of-bound read

1942785 - CVE-2021-23982 Mozilla: Internal network hosts could have been probed by a malicious webpage

1942786 - CVE-2021-23984 Mozilla: Malicious extensions could have spoofed popup information

1942787 - CVE-2021-23987 Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9

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