USN-5168-2: Thunderbird vulnerability

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

• thunderbird - 1:78.14.0+build1-0ubuntu0.20.04.2

Ubuntu 18.04

• 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

• CVE-2021-43527

Related notices

• USN-5168-1: libnss3-dev, nss, libnss3-tools, libnss3
• USN-5168-3: libnss3-1d, libnss3, libnss3-nssdb, nss, libnss3-dev, libnss3-tools
• USN-5168-4: libnss3-1d, libnss3, libnss3-nssdb, nss, libnss3-dev, libnss3-tools