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AUSCERT External Security Bulletin Redistribution
MFSA 2022-22 Security Vulnerabilities fixed in Thunderbird 91.10
1 June 2022
AusCERT Security Bulletin Summary
Product: Mozilla Thunderbird
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
CVE Names: CVE-2022-31747 CVE-2022-31742 CVE-2022-31741
CVE-2022-31740 CVE-2022-31739 CVE-2022-31738
CVE-2022-31737 CVE-2022-31736 CVE-2022-1834
Comment: CVSS (Max): 7.5* CVE-2022-31747 (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS Source: Red Hat
* Not all CVSS available when published
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Mozilla Foundation Security Advisory 2022-22
Security Vulnerabilities fixed in Thunderbird 91.10
Announced: May 31, 2022
Fixed in: Thunderbird 91.10
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-2022-31736: Cross-Origin resource's length leaked
Reporter: Luan Herrera
A malicious website could have learned the size of a cross-origin resource that
supported Range requests.
o Bug 1735923
# CVE-2022-31737: Heap buffer overflow in WebGL
Reporter: Atte Kettunen
A malicious webpage could have caused an out-of-bounds write in WebGL, leading
to memory corruption and a potentially exploitable crash.
o Bug 1743767
# CVE-2022-31738: Browser window spoof using fullscreen mode
Reporter: Irvan Kurniawan
When exiting fullscreen mode, an iframe could have confused the browser about
the current state of fullscreen, resulting in potential user confusion or
o Bug 1756388
# CVE-2022-31739: Attacker-influenced path traversal when saving downloaded
Reporter: Chaobin Zhang
When downloading files on Windows, the % character was not escaped, which could
have lead to a download incorrectly being saved to attacker-influenced paths
that used variables such as %HOMEPATH% or %APPDATA%.
This bug only affects Thunderbird for Windows. Other operating systems are
o Bug 1765049
# CVE-2022-31740: Register allocation problem in WASM on arm64
Reporter: Gary Kwong
On arm64, WASM code could have resulted in incorrect assembly generation
leading to a register allocation problem, and a potentially exploitable crash.
o Bug 1766806
# CVE-2022-31741: Uninitialized variable leads to invalid memory read
A crafted CMS message could have been processed incorrectly, leading to an
invalid memory read, and potentially further memory corruption.
o Bug 1767590
# CVE-2022-1834: Braille space character caused incorrect sender email to be
shown for a digitally signed email
Reporter: Jonathan von Niessen
When displaying the sender of an email, and the sender name contained the
Braille Pattern Blank space character multiple times, Thunderbird would have
displayed all the spaces. This could have been used by an attacker to send an
email message with the attacker's digital signature, that was shown with an
arbitrary sender email address chosen by the attacker. If the sender name
started with a false email address, followed by many Braille space characters,
the attacker's email address was not visible. Because Thunderbird compared the
invisible sender address with the signature's email address, if the signing key
or certificate was accepted by Thunderbird, the email was shown as having a
valid digital signature.
o Bug 1767816
# CVE-2022-31742: Querying a WebAuthn token with a large number of
allowCredential entries may have leaked cross-origin information
An attacker could have exploited a timing attack by sending a large number of
allowCredential entries and detecting the difference between invalid key
handles and cross-origin key handles. This could have led to cross-origin
account linking in violation of WebAuthn goals.
o Bug 1730434
# CVE-2022-31747: Memory safety bugs fixed in Thunderbird 91.10
Reporter: Mozilla developers and community
Mozilla developers Andrew McCreight, Nicolas B. Pierron, and the Mozilla
Fuzzing Team reported memory safety bugs present in Thunderbird 91.9. 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 91.10
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