[USN-4936-1] Thunderbird vulnerabilities

========================================================================== Ubuntu Security Notice USN-4936-1 May 06, 2021
thunderbird vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in Thunderbird.
Software Description: – 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 LTS: 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: ubuntu.com/security/notices/USN-4936-1 CVE-2021-23968, CVE-2021-23969, CVE-2021-23973, CVE-2021-23978, CVE-2021-29950
Package Information:
launchpad.net/ubuntu/+source/thunderbird/1:78.8.1+build1-0ubuntu0.20.10.1
launchpad.net/ubuntu/+source/thunderbird/1:78.8.1+build1-0ubuntu0.20.04.1