========================================================================== Ubuntu Security Notice USN-4995-1 June 22, 2021 thunderbird vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - 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, spoof the UI, bypass security restrictions, or execute arbitrary code. (CVE-2021-23961, CVE-2021-23981, CVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998, CVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967) It was discovered that extensions could open popup windows with control of the window title in some circumstances. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to spoof a website and trick the user into providing credentials. (CVE-2021-23984) Multiple security issues were discovered in Thunderbird's OpenPGP integration. If a user were tricked into importing a specially crafted key in some circumstances, an attacker could potentially exploit this to cause a denial of service (inability to send encrypted email) or confuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993) A use-after-free was discovered when Responsive Design Mode was enabled. If a user were tricked into opening a specially crafted website with Responsive Design Mode enabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-23995) It was discovered that Thunderbird mishandled ftp URLs with encoded newline characters. If a user were tricked into clicking on a specially crafted link, an attacker could potentially exploit this to send arbitrary FTP commands. (CVE-2021-24002) It was discovered that Thunderbird wrote signatures to disk and read them back during verification. A local attacker could potentially exploit this to replace the data with another signature file. (CVE-2021-29948) It was discovered that Thunderbird might load an alternative OTR library. If a user were tricked into copying a specially crafted library to one of Thunderbird's search paths, an attacker could potentially exploit this to execute arbitrary code. (CVE-2021-29949) It was discovered that secret keys imported into Thunderbird were stored unencrypted. A local attacker could potentially exploit this to obtain private keys. (CVE-2021-29956) It was discovered that Thunderbird did not indicate when an inline signed or encrypted message contained additional unprotected parts. (CVE-2021-29957) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: thunderbird 1:78.11.0+build1-0ubuntu0.21.04.2 Ubuntu 20.10: thunderbird 1:78.11.0+build1-0ubuntu0.20.10.2 Ubuntu 20.04 LTS: thunderbird 1:78.11.0+build1-0ubuntu0.20.04.2 After a standard system update you need to restart Thunderbird to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-4995-1 CVE-2021-23961, CVE-2021-23981, CVE-2021-23982, CVE-2021-23984, CVE-2021-23987, CVE-2021-23991, CVE-2021-23992, CVE-2021-23993, CVE-2021-23994, CVE-2021-23995, CVE-2021-23998, CVE-2021-23999, CVE-2021-24002, CVE-2021-29945, CVE-2021-29946, CVE-2021-29948, CVE-2021-29949, CVE-2021-29956, CVE-2021-29957, CVE-2021-29967 Package Information: https://launchpad.net/ubuntu/+source/thunderbird/1:78.11.0+build1-0ubuntu0.21.04.2 https://launchpad.net/ubuntu/+source/thunderbird/1:78.11.0+build1-0ubuntu0.20.10.2 https://launchpad.net/ubuntu/+source/thunderbird/1:78.11.0+build1-0ubuntu0.20.04.2