USN-4936-1: Thunderbird vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS

Packages

• thunderbird - Mozilla Open Source mail and newsgroup client

Details

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,
obtain sensitive information, or execute arbitrary code. (CVE-2021-23968,
CVE-2021-23969, CVE-2021-23973, CVE-2021-23978)

It was discovered that Thunderbird may keep key material in memory in some
circumstances. A local attacker could potentially exploit this to obtain
private keys. (CVE-2021-29950)

Update instructions

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

Ubuntu 20.10

• thunderbird - 1:78.8.1+build1-0ubuntu0.20.10.1

Ubuntu 20.04

• thunderbird - 1:78.8.1+build1-0ubuntu0.20.04.1

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

References

• CVE-2021-23969
• CVE-2021-23978
• CVE-2021-23968
• CVE-2021-23973
• CVE-2021-29950

Related notices

• USN-4756-1