RHSA-2021:2881 - Security Advisory

Topic

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

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 Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 78.12.0.

Security Fix(es):

• Mozilla: IMAP server responses sent by a MITM prior to STARTTLS could be processed (CVE-2021-29969)
• Mozilla: Use-after-free in accessibility features of a document (CVE-2021-29970)
• Mozilla: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12 (CVE-2021-29976)
• chromium-browser: Out of bounds write in ANGLE (CVE-2021-30547)

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

All running instances of Thunderbird must be restarted for the update 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 Power, little endian 7 ppc64le

Fixes

• BZ - 1970109 - CVE-2021-30547 chromium-browser: Out of bounds write in ANGLE
• BZ - 1982013 - CVE-2021-29970 Mozilla: Use-after-free in accessibility features of a document
• BZ - 1982014 - CVE-2021-29976 Mozilla: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12
• BZ - 1982015 - CVE-2021-29969 Mozilla: IMAP server responses sent by a MITM prior to STARTTLS could be processed

CVEs

• CVE-2021-29969
• CVE-2021-29970
• CVE-2021-29976
• CVE-2021-30547

References

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