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AUSCERT External Security Bulletin Redistribution
MFSA 2022-06 Security Vulnerabilities fixed in Thunderbird 91.6
14 February 2022
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
CVE Names: CVE-2022-22764 CVE-2022-22763 CVE-2022-22761
CVE-2022-22760 CVE-2022-22759 CVE-2022-22756
Comment: CVSS (Max): 7.5 CVE-2022-22754 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS Source: Red Hat
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Mozilla Foundation Security Advisory 2022-06
Security Vulnerabilities fixed in Thunderbird 91.6
Announced: February 8, 2022
Fixed in: Thunderbird 91.6
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-2022-22753: Privilege Escalation to SYSTEM on Windows via Maintenance
Reporter: Seb Patane
A Time-of-Check Time-of-Use bug existed in the Maintenance (Updater) Service
that could be abused to grant Users write access to an arbitrary directory.
This could have been used to escalate to SYSTEM access.
This bug only affects Thunderbird on Windows. Other operating systems are
o Bug 1732435
# CVE-2022-22754: Extensions could have bypassed permission confirmation during
Reporter: Rob Wu
If a user installed an extension of a particular type, the extension could have
auto-updated itself and while doing so, bypass the prompt which grants the new
version the new requested permissions.
o Bug 1750565
# CVE-2022-22756: Drag and dropping an image could have resulted in the dropped
object being an executable
Reporter: Abdulrahman Alqabandi
If a user was convinced to drag and drop an image to their desktop or other
folder, the resulting object could have been changed into an executable script
which would have run arbitrary code after the user clicked on it.
o Bug 1317873
# CVE-2022-22759: Sandboxed iframes could have executed script if the parent
Reporter: Johan Carlsson
If a document created a sandboxed iframe without allow-scripts, and
subsequently appended an element to the iframe's document that e.g. had a
o Bug 1739957
# CVE-2022-22760: Cross-Origin responses could be distinguished between script
and non-script content-types
Reporter: Luan Herrera
When importing resources using Web Workers, error messages would distinguish
responses. This could have been abused to learn information cross-origin.
o Bug 1740985
o Bug 1748503
# CVE-2022-22761: frame-ancestors Content Security Policy directive was not
enforced for framed extension pages
Reporter: Mart Gil Robles (Mart at FlowCrypt)
Web-accessible extension pages (pages with a moz-extension:// scheme) were not
correctly enforcing the frame-ancestors directive when it was used in the Web
Extension's Content Security Policy.
o Bug 1745566
# CVE-2022-22763: Script Execution during invalid object state
Reporter: Mozilla Fuzzing Team
When a worker is shutdown, it was possible to cause script to run late in the
lifecycle, at a point after where it should not be possible.
o Bug 1740534
# CVE-2022-22764: Memory safety bugs fixed in Thunderbird 91.6
Reporter: Mozilla developers and community
Mozilla developers and community members Paul Adenot and the Mozilla Fuzzing
Team reported memory safety bugs present in Thunderbird 91.5. 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.
o Memory safety bugs fixed in Thunderbird 91.6
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