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AUSCERT External Security Bulletin Redistribution
ESB-2020.2292
MFSA 2020-26 Security Vulnerabilities fixed in Thunderbird 68.10.0
3 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird
Publisher: Mozilla
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Unknown/Unspecified
Access Confidential Data -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12421 CVE-2020-12420 CVE-2020-12419
CVE-2020-12418 CVE-2020-12417
Reference: ESB-2020.2278
ESB-2020.2277
ESB-2020.2268
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-26/
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Mozilla Foundation Security Advisory 2020-26
Security Vulnerabilities fixed in Thunderbird 68.10.0
Announced
June 30, 2020
Impact
high
Products
Thunderbird
Fixed in
Thunderbird 68.10
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-2020-12417: Memory corruption due to missing sign-extension for ValueTags
on ARM64
Reporter
Deian Stefan
Impact
high
Description
Due to confusion about ValueTags on JavaScript Objects, an object may pass
through the type barrier, resulting in memory corruption and a potentially
exploitable crash.
Note: this issue only affects Firefox on ARM64 platforms.
References
o Bug 1640737
# CVE-2020-12418: Information disclosure due to manipulated URL object
Reporter
Marcin 'Icewall' Noga of Cisco Talos
Impact
high
Description
Manipulating individual parts of a URL object could have caused an
out-of-bounds read, leaking process memory to malicious JavaScript.
References
o Bug 1641303
# CVE-2020-12419: Use-after-free in nsGlobalWindowInner
Reporter
worcester12345
Impact
high
Description
When processing callbacks that occurred during window flushing in the parent
process, the associated window may die; causing a use-after-free condition.
This could have led to memory corruption and a potentially exploitable crash.
References
o Bug 1643874
# CVE-2020-12420: Use-After-Free when trying to connect to a STUN server
Reporter
Byron Campen
Impact
high
Description
When trying to connect to a STUN server, a race condition could have caused a
use-after-free of a pointer, leading to memory corruption and a potentially
exploitable crash.
References
o Bug 1643437
# MFSA-2020-0001: Automatic account setup leaks Microsoft Exchange login
credentials
Reporter
Magnus Melin
Impact
high
Description
If an attacker intercepts Thunderbird's initial attempt to perform automatic
account setup using the Microsoft Exchange autodiscovery mechanism, and the
attacker sends a crafted response, then Thunderbird sends username and password
over https to a server controlled by the attacker.
Note: This issue is pending a CVE assignment and will be updated when one is
available.
References
o Bug 1606610
# CVE-2020-12421: Add-On updates did not respect the same certificate trust
rules as software updates
Reporter
Chuck Harmston, Robert Hardy
Impact
moderate
Description
When performing add-on updates, certificate chains terminating in
non-built-in-roots were rejected (even if they were legitimately added by an
administrator.) This could have caused add-ons to become out-of-date silently
without notification to the user.
References
o Bug 1308251
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