A Thunderbird security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.04, and 21.10.
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Ubuntu Security Notice USN-5168-2
December 01, 2021
thunderbird vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Thunderbird could be made to crash or run programs if it verified a
specially crafted signature.
Software Description:
- 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:
thunderbird 1:91.3.1+build1-0ubuntu0.21.10.2
Ubuntu 21.04:
thunderbird 1:78.14.0+build1-0ubuntu0.21.04.2
Ubuntu 20.04 LTS:
thunderbird 1:78.14.0+build1-0ubuntu0.20.04.2
Ubuntu 18.04 LTS:
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:
https://ubuntu.com/security/notices/USN-5168-2
https://ubuntu.com/security/notices/USN-5168-1
CVE-2021-43527
Package Information:
https://launchpad.net/ubuntu/+source/thunderbird/1:91.3.1+build1-0ubuntu0.21.10.2
https://launchpad.net/ubuntu/+source/thunderbird/1:78.14.0+build1-0ubuntu0.21.04.2
https://launchpad.net/ubuntu/+source/thunderbird/1:78.14.0+build1-0ubuntu0.20.04.2
https://launchpad.net/ubuntu/+source/thunderbird/1:78.14.0+build1-0ubuntu0.18.04.2
