[USN-5058-1] Thunderbird vulnerabilities

Chris Coulson chris.coulson at canonical.com
Tue Aug 31 12:58:25 UTC 2021

Ubuntu Security Notice USN-5058-1
August 31, 2021

thunderbird vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


Several security issues were fixed in Thunderbird.

Software Description:
- thunderbird: Mozilla Open Source mail and newsgroup client


It was discovered that Thunderbird didn't ignore IMAP server responses
prior to completion of the STARTTLS handshake. A person-in-the-middle
could potentially exploit this to trick Thunderbird into showing incorrect
information. (CVE-2021-29969)

Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context, an
attacker could potentially exploit these to cause a denial of service, or
execute arbitrary code. (CVE-2021-29970, CVE-2021-29976, CVE-2021-29980,
CVE-2021-29984, CVE-2021-29985, CVE-2021-29986, CVE-2021-29988,
CVE-2021-29989, CVE-2021-30547)

Update instructions:

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

Ubuntu 21.04:
  thunderbird                     1:78.13.0+build1-0ubuntu0.21.04.2

Ubuntu 20.04 LTS:
  thunderbird                     1:78.13.0+build1-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
  thunderbird                     1:78.13.0+build1-0ubuntu0.18.04.1

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

  CVE-2021-29969, CVE-2021-29970, CVE-2021-29976, CVE-2021-29980,
  CVE-2021-29984, CVE-2021-29985, CVE-2021-29986, CVE-2021-29988,
  CVE-2021-29989, CVE-2021-30547

Package Information:




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