USN-4294-1: OpenSMTPD vulnerabilities

USN-4294-1: OpenSMTPD vulnerabilities

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

Source: USN-4294-1: OpenSMTPD vulnerabilities