An Email-Address-List security update has been released for Ubuntu 18.04 LTS and 16.04 LTS.

USN-4517-1: Email-Address-List vulnerability

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Ubuntu Security Notice USN-4517-1
September 17, 2020

libemail-address-list-perl vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Email-Address-List could be made to remotely exhaust resources if it received specially crafted email data.

Software Description:
- libemail-address-list-perl: RFC close address list parsing
Details:

It was discovered that Email-Address-List does not properly parse email addresses during email-ingestion. A remote attacker could use this issue to cause an algorithmic complexity attack, resulting in a denial of service. (CVE-2018-18898)

Update instructions:

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

Ubuntu 18.04 LTS:
libemail-address-list-perl 0.05-1+deb9u1build0.18.04.1
Ubuntu 16.04 LTS:
libemail-address-list-perl 0.05-1+deb9u1build0.16.04.1
In general, a standard system update will make all the necessary changes.
References:
  https://usn.ubuntu.com/4517-1
CVE-2018-18898

Package Information:

  https://launchpad.net/ubuntu/+source/libemail-address-list-perl/0.05-1+deb9u1build0.18.04.1

  https://launchpad.net/ubuntu/+source/libemail-address-list-perl/0.05-1+deb9u1build0.16.04.1