========================================================================== Ubuntu Security Notice USN-4202-2 December 10, 2019 thunderbird regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 19.10 - Ubuntu 18.04 LTS Summary: USN-4202-1 caused a regression in Thunderbird. Software Description: - thunderbird: Mozilla Open Source mail and newsgroup client Details: USN-4202-1 fixed vulnerabilities in Thunderbird. After upgrading, Thunderbird created a new profile for some users. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that a specially crafted S/MIME message with an inner encryption layer could be displayed as having a valid signature in some circumstances, even if the signer had no access to the encrypted message. An attacker could potentially exploit this to spoof the message author. (CVE-2019-11755) Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, bypass security restrictions, bypass same-origin restrictions, conduct cross-site scripting (XSS) attacks, or execute arbitrary code. (CVE-2019-11757, CVE-2019-11758, CVE-2019-11759, CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764) A heap overflow was discovered in the expat library in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2019-15903) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 19.10: thunderbird 1:68.2.2+build1-0ubuntu0.19.10.1 Ubuntu 18.04 LTS: thunderbird 1:68.2.2+build1-0ubuntu0.18.04.1 After a standard system update you need to restart Thunderbird to make all the necessary changes. References: https://usn.ubuntu.com/4202-2 https://usn.ubuntu.com/4202-1 https://launchpad.net/bugs/1854150 Package Information: https://launchpad.net/ubuntu/+source/thunderbird/1:68.2.2+build1-0ubuntu0.19.10.1 https://launchpad.net/ubuntu/+source/thunderbird/1:68.2.2+build1-0ubuntu0.18.04.1