Synopsis:          Important: thunderbird security update
Advisory ID:       SLSA-2021:4134-1
Issue Date:        2021-11-05
CVE Numbers:       CVE-2021-38503
                   CVE-2021-38504
                   CVE-2021-38506
                   CVE-2021-38507
                   CVE-2021-38508
                   CVE-2021-38509
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This update upgrades Thunderbird to version 91.3.0.

Security Fix(es):

* Mozilla: Use-after-free in HTTP2 Session object

* Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

* Mozilla: iframe sandbox rules did not apply to XSLT stylesheets
(CVE-2021-38503)

* Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

* Mozilla: Firefox could be coaxed into going into fullscreen mode without
notification or warning (CVE-2021-38506)

* Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the
Same-Origin-Policy on services hosted on other ports (CVE-2021-38507)

* Mozilla: Permission Prompt could be overlaid, resulting in user
confusion  and potential spoofing (CVE-2021-38508)

* Mozilla: Javascript alert box could have been spoofed onto an arbitrary
domain (CVE-2021-38509)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
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SL7
  x86_64
    thunderbird-91.3.0-2.el7_9.x86_64.rpm
    thunderbird-debuginfo-91.3.0-2.el7_9.x86_64.rpm

- Scientific Linux Development Team