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

USN-4598-1: LibEtPan vulnerability

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Ubuntu Security Notice USN-4598-1
October 22, 2020

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

- Ubuntu 16.04 LTS

Summary:

LibEtPan could be made to expose sensitive information over the network.

Software Description:
- libetpan: Mail Framework for C Language

Details:

It was discovered that LibEtPan incorrectly handled STARTTLS when using
IMAP, SMTP and POP3. A remote attacker could possibly use this issue
to perform a response injection attack. (CVE-2020-15953)

Update instructions:

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

Ubuntu 16.04 LTS:
libetpan-dev 1.6-1ubuntu0.1
libetpan17 1.6-1ubuntu0.1

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

References:
  https://usn.ubuntu.com/4598-1
CVE-2020-15953

Package Information:
  https://launchpad.net/ubuntu/+source/libetpan/1.6-1ubuntu0.1