Ubuntu Security Notice USN-4294-1 ≈ Packet Storm

Ubuntu Security Notice USN-4294-1
March 02, 2020

OpenSMTPD vulnerabilities

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.

Software Description:
– 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)

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

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

CVE-2020-8793, CVE-2020-8794

Package Information:

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