Ubuntu Security Notice USN-4294-1
March 02, 2020
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 19.10
– Ubuntu 18.04 LTS
Several security issues were fixed in opensmtpd.
– opensmtpd: secure, reliable, lean, and easy-to configure SMTP server
It was discovered that OpenSMTPD mishandled certain input. A remote,
unauthenticated attacker could use this vulnerability to execute arbitrary
shell commands as any non-root user. (CVE-2020-8794)
It was discovered that OpenSMTPD did not properly handle hardlinks under
certain conditions. An unprivileged local attacker could read the first
line of any file on the filesystem. (CVE-2020-8793)
The problem can be corrected by updating your system to the following
Ubuntu 18.04 LTS:
In general, a standard system update will make all the necessary changes.