A TNEF security update has been released for Ubuntu Linux 16.04 LTS.

USN-4524-1: TNEF vulnerabilities

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Ubuntu Security Notice USN-4524-1
September 21, 2020

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

- Ubuntu 16.04 LTS

Summary:

TNEF could be made to crash or write arbitrary files to the filesystem.

Software Description:
- tnef: Tool to unpack MIME application/ms-tnef attachments

Details:

Paul Dreik discovered that TNEF incorrectly handled filenames. If a user
were tricked into opening a specially crafted email attachment, an
attacker could possibly use this issue to write arbitrary files to the
filesystem or cause TNEF crash, resulting in a denial of service.
(CVE-2019-18849)

Update instructions:

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

Ubuntu 16.04 LTS:
tnef 1.4.9-1+deb8u4build0.16.04.1

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

References:
  https://usn.ubuntu.com/4524-1
CVE-2019-18849

Package Information:
  https://launchpad.net/ubuntu/+source/tnef/1.4.9-1+deb8u4build0.16.04.1