--- title: 'USN-4174-1: HAproxy vulnerability | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-4174-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4174-1 --- # USN-4174-1: HAproxy vulnerability Publication date 5 November 2019 Overview HAproxy would allow unintended access if ii received specially crafted HTTP request. Releases [19.10](https://ubuntu.com/security/notices?release=eoan) [19.04](https://ubuntu.com/security/notices?release=disco) [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [haproxy](https://ubuntu.com/security/cves?package=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 In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 19.10 eoan | [haproxy](https://launchpad.net/ubuntu/+source/haproxy) –  [2.0.5-1ubuntu0.2](https://launchpad.net/ubuntu/+source/haproxy/2.0.5-1ubuntu0.2) | | | | 19.04 disco | [haproxy](https://launchpad.net/ubuntu/+source/haproxy) –  [1.8.19-1ubuntu1.2](https://launchpad.net/ubuntu/+source/haproxy/1.8.19-1ubuntu1.2) | | | | 18.04 LTS bionic | [haproxy](https://launchpad.net/ubuntu/+source/haproxy) –  [1.8.8-1ubuntu0.7](https://launchpad.net/ubuntu/+source/haproxy/1.8.8-1ubuntu0.7) | | | | 16.04 LTS xenial | [haproxy](https://launchpad.net/ubuntu/+source/haproxy) –  [1.6.3-1ubuntu0.3](https://launchpad.net/ubuntu/+source/haproxy/1.6.3-1ubuntu0.3) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2019-18277](https://ubuntu.com/security/CVE-2019-18277)