RHSA-2021:0994: Red Hat Security Advisory: thunderbird security update

An update for thunderbird 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.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. Related CVEs:
• CVE-2021-23981: Mozilla: Texture upload into an unbound backing buffer resulted in an out-of-bound read
• CVE-2021-23982: Mozilla: Internal network hosts could have been probed by a malicious webpage
• CVE-2021-23984: Mozilla: Malicious extensions could have spoofed popup information
• CVE-2021-23987: Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9