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AUSCERT External Security Bulletin Redistribution
ESB-2021.3401
MFSA 2021-46 and MFSA 2021-47 Security Vulnerabilities fixed in Thunderbird
14 October 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
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-38502 CVE-2021-38501 CVE-2021-38500
CVE-2021-38498 CVE-2021-38497 CVE-2021-38496
CVE-2021-32810
Reference: ESB-2021.3390
ESB-2021.3376
ESB-2021.3338
ESB-2021.3298
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2021-46/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-47/
Comment: This bulletin contains two (2) Mozilla security advisories.
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Mozilla Foundation Security Advisory 2021-46
Security Vulnerabilities fixed in Thunderbird 78.15
Announced: October 5, 2021
Impact: high
Products: Thunderbird
Fixed in: Thunderbird 78.15
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-2021-38496: Use-after-free in MessageTask
Reporter: Yangkang of 360 ATA Team
Impact: high
Description
During operations on MessageTasks, a task may have been removed while it was
still scheduled, resulting in memory corruption and a potentially exploitable
crash.
References
o Bug 1725335
# CVE-2021-38500: Memory safety bugs fixed in Thunderbird 78.15
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers and community members Andreas Pehrson and Christian Holler
reported memory safety bugs present in Thunderbird 78.14. 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 78.15
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Mozilla Foundation Security Advisory 2021-47
Security Vulnerabilities fixed in Thunderbird 91.2
Announced: October 6, 2021
Impact: high
Products: Thunderbird
Fixed in: Thunderbird 91.2
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-2021-38502: Downgrade attack on SMTP STARTTLS connections
Reporter: Mattias Jacobsson
Impact: high
Description
Thunderbird ignored the configuration to require STARTTLS security for an SMTP
connection. A MITM could perform a downgrade attack to intercept transmitted
messages, or could take control of the authenticated session to execute SMTP
commands chosen by the MITM. If an unprotected authentication method was
configured, the MITM could obtain the authentication credentials, too.
References
o Bug 1733366
# CVE-2021-38496: Use-after-free in MessageTask
Reporter: Yangkang of 360 ATA Team
Impact: high
Description
During operations on MessageTasks, a task may have been removed while it was
still scheduled, resulting in memory corruption and a potentially exploitable
crash.
References
o Bug 1725335
# CVE-2021-38497: Validation message could have been overlaid on another origin
Reporter: Irvan Kurniawan
Impact: moderate
Description
Through use of reportValidity() and window.open(), a plain-text validation
message could have been overlaid on another origin, leading to possible user
confusion and spoofing attacks.
References
o Bug 1726621
# CVE-2021-38498: Use-after-free of nsLanguageAtomService object
Reporter: Yangkang of 360 ATA Team
Impact: moderate
Description
During process shutdown, a document could have caused a use-after-free of a
languages service object, leading to memory corruption and a potentially
exploitable crash.
References
o Bug 1729642
# CVE-2021-32810: Data race in crossbeam-deque
Reporter: Maor Kleinberger
Impact: moderate
Description
In the crossbeam crate, one or more tasks in the worker queue could have been
be popped twice instead of other tasks that are forgotten and never popped. If
tasks are allocated on the heap, this could have caused a double free and a
memory leak.
References
o Bug 1729813
o Bug https://github.com/crossbeam-rs/crossbeam/security/advisories/
GHSA-pqqp-xmhj-wgcw
# CVE-2021-38500: Memory safety bugs fixed in Thunderbird 91.2
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers and community members Andreas Pehrson and Christian Holler
reported memory safety bugs present in Thunderbird 91.1. 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 91.2
# CVE-2021-38501: Memory safety bugs fixed in Thunderbird 91.2
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers and community members Kevin Brosnan, Mihai Alexandru Michis,
and Christian Holler reported memory safety bugs present in Thunderbird 91.1.
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 91.2
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