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AUSCERT External Security Bulletin Redistribution
ESB-2021.4062
USN-5168-2: Thunderbird vulnerability
2 December 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-43527
Reference: ESB-2021.4061
Original Bulletin:
https://ubuntu.com/security/notices/USN-5168-2
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USN-5168-2: Thunderbird vulnerability
01 December 2021
Thunderbird could be made to crash or run programs if it verified a
specially crafted signature.
Releases
o Ubuntu 21.10
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o thunderbird - Mozilla Open Source mail and newsgroup client
Details
Tavis Ormandy discovered that NSS, included with Thunderbird, incorrectly
handled verifying DSA/RSA-PSS signatures. A remote attacker could use this
issue to cause Thunderbird to crash, resulting in a denial of service, or
possibly execute arbitrary code.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.10
o thunderbird - 1:91.3.1+build1-0ubuntu0.21.10.2
Ubuntu 21.04
o thunderbird - 1:78.14.0+build1-0ubuntu0.21.04.2
Ubuntu 20.04
o thunderbird - 1:78.14.0+build1-0ubuntu0.20.04.2
Ubuntu 18.04
o thunderbird - 1:78.14.0+build1-0ubuntu0.18.04.2
After a standard system update you need to restart Thunderbird to make
all the necessary changes.
References
o CVE-2021-43527
Related notices
o USN-5168-1 : nss, libnss3, libnss3-dev, libnss3-tools
o USN-5168-3 : nss, libnss3-nssdb, libnss3-dev, libnss3-1d, libnss3,
libnss3-tools
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