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.

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.

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CVE-2023-6856: Heap-based Buffer Overflow (CWE-122)
CVE-2023-6857: Race Condition Enabling Link Following (CWE-363)
CVE-2023-6858: Heap-based Buffer Overflow (CWE-122)
CVE-2023-6859: Use After Free (CWE-416)
CVE-2023-6860: Improper Input Validation (CWE-20)
CVE-2023-6861: Heap-based Buffer Overflow (CWE-122)
CVE-2023-6862: Use After Free (CWE-416)
CVE-2023-6863: Improper Input Validation (CWE-20)
CVE-2023-6864: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)
CVE-2023-50761: Improper Verification of Cryptographic Signature (CWE-347)
CVE-2023-50762: Improper Verification of Cryptographic Signature (CWE-347)