RHSA-2020:1488 - Security Advisory

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 6.

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 68.7.0.

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)
• Mozilla: Uninitialized memory could be read when using the WebGL copyTexSubImage method (CVE-2020-6821)
• Mozilla: Memory safety bugs fixed in Firefox 75 and Firefox ESR 68.7 (CVE-2020-6825)
• Mozilla: Out of bounds write in GMPDecodeData when processing large images (CVE-2020-6822)

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 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

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
• BZ - 1821674 - CVE-2020-6821 Mozilla: Uninitialized memory could be read when using the WebGL copyTexSubImage method
• BZ - 1821676 - CVE-2020-6822 Mozilla: Out of bounds write in GMPDecodeData when processing large images
• BZ - 1821682 - CVE-2020-6825 Mozilla: Memory safety bugs fixed in Firefox 75 and Firefox ESR 68.7

CVEs

• CVE-2020-6819
• CVE-2020-6820
• CVE-2020-6821
• CVE-2020-6822
• CVE-2020-6825

References

• https://access.redhat.com/security/updates/classification/#important
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-14/