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AUSCERT External Security Bulletin Redistribution
ESB-2021.0588
USN-4736-1: Thunderbird vulnerabilities
17 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23964 CVE-2021-23960 CVE-2021-23954
CVE-2021-23953 CVE-2020-26976 CVE-2020-15685
Reference: ESB-2021.0401
ESB-2021.0362
ESB-2021.0361
ESB-2021.0339
Original Bulletin:
https://ubuntu.com/security/notices/USN-4736-1
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USN-4736-1: Thunderbird vulnerabilities
16 February 2021
Several security issues were fixed in Thunderbird.
Releases
o Ubuntu 20.10
Packages
o thunderbird - Mozilla Open Source mail and newsgroup client
Details
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, or execute arbitrary code. ( CVE-2020-26976 ,
CVE-2021-23953 , CVE-2021-23954 , CVE-2021-23960 , CVE-2021-23964 )
It was discovered that responses received during the plaintext phase of
the STARTTLS connection setup were subsequently evaluated during the
encrypted session. A person in the middle could potentially exploit this
to perform a response injection attack. ( CVE-2020-15685 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o thunderbird - 1:78.7.1+build1-0ubuntu0.20.10.4
After a standard system update you need to restart Thunderbird to make
all the necessary changes.
References
o CVE-2020-15685
o CVE-2021-23964
o CVE-2021-23953
o CVE-2021-23954
o CVE-2020-26976
o CVE-2021-23960
Related notices
o USN-4717-1 : firefox
o USN-4671-1 : firefox
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