A HAProxy security update has been released for Ubuntu Linux 19.10 and 18.04 LTS.

USN-4321-1: HAProxy vulnerability

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Ubuntu Security Notice USN-4321-1
April 07, 2020

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

- Ubuntu 19.10
- Ubuntu 18.04 LTS

Summary:

HAProxy could be made to execute arbitrary code if it received a specially crafted HTTP/2 request.

Software Description:
- haproxy: fast and reliable load balancing reverse proxy

Details:

Felix Wilhelm discovered that HAProxy incorrectly handled certain HTTP/2 requests.
An attacker could possibly use this to execute arbitrary code.

Update instructions:

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

Ubuntu 19.10:
haproxy 2.0.5-1ubuntu0.4

Ubuntu 18.04 LTS:
haproxy 1.8.8-1ubuntu0.10

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

References:
  https://usn.ubuntu.com/4321-1
CVE-2020-11100

Package Information:
  https://launchpad.net/ubuntu/+source/haproxy/2.0.5-1ubuntu0.4
  https://launchpad.net/ubuntu/+source/haproxy/1.8.8-1ubuntu0.10