RHSA-2021:3841 - 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 91.2.0.

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)
• Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)
• 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

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 Server - Extended Life Cycle Support 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
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

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
• BZ - 2013469 - CVE-2021-38502 Mozilla: Downgrade attack on SMTP STARTTLS connections

CVEs

• CVE-2021-32810
• CVE-2021-38496
• CVE-2021-38497
• CVE-2021-38498
• CVE-2021-38500
• CVE-2021-38501
• CVE-2021-38502

References

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