Leonidas S. Barbosa has announced that new HAproxy packages has been released for Ubuntu Linux 19.10, 19.04, 18.04 LTS, and 16.04 LTS, to address a privilege escalation.

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Ubuntu Security Notice USN-4174-1

November 05, 2019

haproxy vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

HAproxy would allow unintended access if ii received specially crafted HTTP request.

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

Details:

It was discovered that HAproxy incorrectly handled certain HTTP requests. An attacker could possibly use this issue to a privilege escalation (Request Smuggling).

Update instructions:

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

Ubuntu 19.10:
haproxy 2.0.5-1ubuntu0.2

Ubuntu 19.04:
haproxy 1.8.19-1ubuntu1.2

Ubuntu 18.04 LTS:
haproxy 1.8.8-1ubuntu0.7

Ubuntu 16.04 LTS:
haproxy 1.6.3-1ubuntu0.3

In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4174-1
CVE-2019-18277

Package Information:
https://launchpad.net/ubuntu/+source/haproxy/2.0.5-1ubuntu0.2 https://launchpad.net/ubuntu/+source/haproxy/1.8.19-1ubuntu1.2 https://launchpad.net/ubuntu/+source/haproxy/1.8.8-1ubuntu0.7 https://launchpad.net/ubuntu/+source/haproxy/1.6.3-1ubuntu0.3