USN-5058-1: Thunderbird vulnerabilities

Releases

• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• thunderbird - Mozilla Open Source mail and newsgroup client

Details

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

• thunderbird - 1:78.13.0+build1-0ubuntu0.20.04.2

Ubuntu 18.04

• 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.

References

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

Related notices

• USN-5037-1
• USN-5011-1