Important: thunderbird security update

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions.

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 115.6.0.

Security Fix(es):

• Mozilla: Heap-buffer-overflow affecting WebGL <code>DrawElementsInstanced</code> method with Mesa VM driver (CVE-2023-6856)
• Mozilla: Memory safety bugs fixed in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6 (CVE-2023-6864)
• Mozilla: S/MIME signature accepted despite mismatching message date (CVE-2023-50761)
• Mozilla: Truncated signed text was shown with a valid OpenPGP signature (CVE-2023-50762)
• Mozilla: Symlinks may resolve to smaller than expected buffers (CVE-2023-6857)
• Mozilla: Heap buffer overflow in <code>nsTextFragment</code> (CVE-2023-6858)
• Mozilla: Use-after-free in PR_GetIdentitiesLayer (CVE-2023-6859)
• Mozilla: Potential sandbox escape due to <code>VideoBridge</code> lack of texture validation (CVE-2023-6860)
• Mozilla: Heap buffer overflow affected <code>nsWindow::PickerOpen(void)</code> in headless mode (CVE-2023-6861)
• Mozilla: Use-after-free in <code>nsDNSService</code> (CVE-2023-6862)
• Mozilla: Undefined behavior in <code>ShutdownObserver()</code> (CVE-2023-6863)

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 - AUS 8.4 x86_64
• Red Hat Enterprise Linux Server - TUS 8.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.4 x86_64

Fixes

• BZ - 2255360 - CVE-2023-6856 Mozilla: Heap-buffer-overflow affecting WebGL <code>DrawElementsInstanced</code> method with Mesa VM driver
• BZ - 2255362 - CVE-2023-6857 Mozilla: Symlinks may resolve to smaller than expected buffers
• BZ - 2255363 - CVE-2023-6858 Mozilla: Heap buffer overflow in <code>nsTextFragment</code>
• BZ - 2255364 - CVE-2023-6859 Mozilla: Use-after-free in PR_GetIdentitiesLayer
• BZ - 2255365 - CVE-2023-6860 Mozilla: Potential sandbox escape due to <code>VideoBridge</code> lack of texture validation
• BZ - 2255367 - CVE-2023-6861 Mozilla: Heap buffer overflow affected <code>nsWindow::PickerOpen(void)</code> in headless mode
• BZ - 2255368 - CVE-2023-6862 Mozilla: Use-after-free in <code>nsDNSService</code>
• BZ - 2255369 - CVE-2023-6863 Mozilla: Undefined behavior in <code>ShutdownObserver()</code>
• BZ - 2255370 - CVE-2023-6864 Mozilla: Memory safety bugs fixed in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6
• BZ - 2255378 - CVE-2023-50761 Mozilla: S/MIME signature accepted despite mismatching message date
• BZ - 2255379 - CVE-2023-50762 Mozilla: Truncated signed text was shown with a valid OpenPGP signature

CVEs

• CVE-2023-6856
• CVE-2023-6857
• CVE-2023-6858
• CVE-2023-6859
• CVE-2023-6860
• CVE-2023-6861
• CVE-2023-6862
• CVE-2023-6863
• CVE-2023-6864
• CVE-2023-50761
• CVE-2023-50762

References

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