OpenSMTPD vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

* Ubuntu 19.10
* Ubuntu 18.04 LTS

Summary

Several security issues were fixed in opensmtpd.

Software Description

* opensmtpd - secure, reliable, lean, and easy-to configure SMTP
server

Details

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)

Update instructions

The problem can be corrected by updating your system to the
following package versions:

Ubuntu 19.10
opensmtpd - 6.0.3p1-6ubuntu0.2

Ubuntu 18.04 LTS
opensmtpd - 6.0.3p1-1ubuntu0.2

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary
changes.

References

* CVE-2020-8793
* CVE-2020-8794

--- Mystic BBS v1.12 A45 (Linux/64)
* Origin: BZ&BZ BBS (21:4/110)