1. Ubuntu Security Notices
  2. USN-5168-2

USN-5168-2: Thunderbird vulnerability

Publication date

1 December 2021

Overview

Thunderbird could be made to crash or run programs if it verified a specially crafted signature.

Releases

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.

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

After a standard system update you need to restart Thunderbird to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
21.10 impish thunderbird –  1:91.3.1+build1-0ubuntu0.21.10.2
21.04 hirsute thunderbird –  1:78.14.0+build1-0ubuntu0.21.04.2
20.04 focal thunderbird –  1:78.14.0+build1-0ubuntu0.20.04.2
18.04 bionic thunderbird –  1:78.14.0+build1-0ubuntu0.18.04.2

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›