[USN-4268-1] OpenSMTPD vulnerability

Mike Salvatore mike.salvatore at canonical.com
Wed Feb 5 14:26:06 UTC 2020

Ubuntu Security Notice USN-4268-1
February 05, 2020

OpenSMTPD vulnerability

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

- Ubuntu 19.10
- Ubuntu 18.04 LTS


OpenSMTPD could be made to run programs as root if it received specially
crafted input over the network.

Software Description:
- opensmtpd: secure, reliable, lean, and easy-to configure SMTP server


It was discovered that OpenSMTPD incorrectly verified the sender's or
receiver's e-mail addresses under certain conditions. An attacker could use
this vulnerability to execute arbitrary commands as root.

Update instructions:

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

Ubuntu 19.10:
  opensmtpd                       6.0.3p1-6ubuntu0.1

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

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


Package Information:

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