Ubuntu has released several patches for security vulnerabilities in different versions of the OS, including some CSRF, DoS and remote code execution flaws. Thunderbird is a popular Mozilla email client, the company has recently fixed many other vulnerabilities in the same product, including a cross-site request forgery (CSRF) bug and a memory corruption flaw. Ubuntu also patched several other vulnerabilities, one of them fixes a bug in libssh that could be exploited to cause a denial of service, or execute arbitrary code.”]
Source: https://securityaffairs.co/wordpress/32535/security/ubuntu-patched-security-flaes.html