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USN-5168-2: Thunderbird vulnerability

1 December 2021

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

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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.

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.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 21.10
Ubuntu 21.04
Ubuntu 20.04
Ubuntu 18.04

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

References

Related notices

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