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Mozilla Foundation Security Advisory 2022-18

Security Vulnerabilities fixed in Thunderbird 91.9

Announced
May 3, 2022
Impact
high
Products
Thunderbird
Fixed in
  • Thunderbird 91.9

In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts.

#CVE-2022-1520: Incorrect security status shown after viewing an attached email

Reporter
Thunderbird team
Impact
low
Description

When viewing an email message A, which contains an attached message B, where B is encrypted or digitally signed or both, Thunderbird may show an incorrect encryption or signature status. After opening and viewing the attached message B, when returning to the display of message A, the message A might be shown with the security status of message B.

References

#CVE-2022-29914: Fullscreen notification bypass using popups

Reporter
Irvan Kurniawan
Impact
high
Description

When reusing existing popups Thunderbird would allow them to cover the fullscreen notification UI, which could enable browser spoofing attacks.

References

#CVE-2022-29909: Bypassing permission prompt in nested browsing contexts

Reporter
Armin Ebert
Impact
high
Description

Documents in deeply-nested cross-origin browsing contexts could obtain permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions.

References

#CVE-2022-29916: Leaking browser history with CSS variables

Reporter
Mateusz Sionkowski
Impact
high
Description

Thunderbird would behave slightly differently for already known resources, when loading CSS resources through resolving CSS variables. This could be used to probe the browser history.

References

#CVE-2022-29911: iframe sandbox bypass

Reporter
Trung Pham
Impact
high
Description

An improper implementation of the new iframe sandbox keyword allow-top-navigation-by-user-activation could lead to script execution without allow-scripts being present.

References

#CVE-2022-29912: Reader mode bypassed SameSite cookies

Reporter
Matheus Vrech
Impact
moderate
Description

Requests initiated through reader mode did not properly omit cookies with a SameSite attribute.

References

#CVE-2022-29913: Speech Synthesis feature not properly disabled

Reporter
Andrew McCreight
Impact
moderate
Description

The parent process would not properly check whether the Speech Synthesis feature is enabled, when receiving instructions from a child process.

References

#CVE-2022-29917: Memory safety bugs fixed in Thunderbird 91.9

Reporter
Mozilla developers
Impact
high
Description

Mozilla developers Gabriele Svelto, Tom Ritter and the Mozilla Fuzzing Team reported memory safety bugs present in Thunderbird 91.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

References