1. Ubuntu Security Notices
  2. USN-4294-1

USN-4294-1: OpenSMTPD vulnerabilities

Publication date

2 March 2020

Overview

Several security issues were fixed in opensmtpd.

Releases

Packages

  • 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)

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
19.10 eoan opensmtpd –  6.0.3p1-6ubuntu0.2
18.04 bionic opensmtpd –  6.0.3p1-1ubuntu0.2

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References

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