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AUSCERT External Security Bulletin Redistribution
ESB-2021.2376
MFSA 2021-30 Security Vulnerabilities fixed in Thunderbird 78.12
14 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird
Publisher: Mozilla
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-30547 CVE-2021-29976 CVE-2021-29970
CVE-2021-29969
Reference: ASB-2021.0120
ESB-2021.2119
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/
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Mozilla Foundation Security Advisory 2021-30
Security Vulnerabilities fixed in Thunderbird 78.12
Announced: July 13, 2021
Impact: high
Products: Thunderbird
Fixed in: Thunderbird 78.12
# CVE-2021-29969: IMAP server responses sent by a MITM prior to STARTTLS could
be processed
Reporter: Damian Poddebniak and Fabian Ising
Impact: high
Description
If Thunderbird was configured to use STARTTLS for an IMAP connection, and an
attacker injected IMAP server responses prior to the completion of the STARTTLS
handshake, then Thunderbird didn't ignore the injected data. This could have
resulted in Thunderbird showing incorrect information, for example the attacker
could have tricked Thunderbird to show folders that didn't exist on the IMAP
server.
References
o Bug 1682370
# CVE-2021-29970: Use-after-free in accessibility features of a document
Reporter: Irvan Kurniawan
Impact: high
Description
A malicious webpage could have triggered a use-after-free, memory corruption,
and a potentially exploitable crash.
This bug only affected Thunderbird when accessibility was enabled.
References
o Bug 1709976
# CVE-2021-30547: Out of bounds write in ANGLE
Reporter: (Unknown)
Impact: high
Description
An out of bounds write in ANGLE could have allowed an attacker to corrupt
memory leading to a potentially exploitable crash.
References
o Bug 1715766
# CVE-2021-29976: Memory safety bugs fixed in Thunderbird 78.12
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers Valentin Gosu, Randell Jesup, Emil Ghitta, Tyson Smith, and
Olli Pettay reported memory safety bugs present in Thunderbird 78.11. 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
o Memory safety bugs fixed in Thunderbird 78.12
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