Ubuntu Security Update USN-5246-1: Thunderbird vulnerabilities

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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, conduct spoofing attacks, bypass security restrictions, or execute arbitrary code. (CVE-2021-4129, CVE-2021-4140, CVE-2021-43536, CVE-2021-43537, CVE-2021-43538, CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543, CVE-2021-43545, CVE-2021-43656, CVE-2022-22737, CVE-2022-22738, CVE-2022-22739, CVE-2022-22740, CVE-2022-22741, CVE-2022-22742, CVE-2022-22743, CVE-2022-22745, CVE-2022-22747, CVE-2022-22748, CVE-2022-22751) It was discovered that JavaScript was unexpectedly enabled in the composition area. An attacker could potentially exploit this in combination with another vulnerability, with unspecified impacts. (CVE-2021-43528) A buffer overflow was discovered in the Matrix chat library bundled with Thunderbird. An attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-44538) It was discovered that Thunderbird's OpenPGP integration only considered the inner signed message when checking signature validity in a message that contains an additional outer MIME layer. An attacker could potentially exploit this to trick the user into thinking that a message has a valid signature. (CVE-2021-4126)

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