[RHSA-2019:3237] thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 68.2.0.

Security Fix(es):

• Mozilla: Memory safety bugs fixed in Firefox 70 and Firefox ESR 68.2 (CVE-2019-11764)

• Mozilla: Use-after-free when creating index updates in IndexedDB (CVE-2019-11757)

• Mozilla: Potentially exploitable crash due to 360 Total Security (CVE-2019-11758)

• Mozilla: Stack buffer overflow in HKDF output (CVE-2019-11759)

• Mozilla: Stack buffer overflow in WebRTC networking (CVE-2019-11760)

• Mozilla: Unintended access to a privileged JSONView object (CVE-2019-11761)

• Mozilla: document.domain-based origin isolation has same-origin-property violation (CVE-2019-11762)

• Mozilla: Incorrect HTML parsing results in XSS bypass technique (CVE-2019-11763)

• expat: heap-based buffer over-read via crafted XML input (CVE-2019-15903)

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.