14 DAY TRIAL // On May 16, Canonical published in a security notice details about HAProxy vulnerabilities for its Ubuntu 12.10, Ubuntu 12.04 LTS, and Ubuntu 11.10 operating systems.
According to Canonical, HAProxy could be made to crash or run programs, if it received specially crafted network traffic.
For example, it was discovered that HAProxy incorrectly handled configurations where global.tune.bufsize was set to a value higher than the default. A remote attacker could use this issue to cause a denial of service, or even to execute arbitrary code.
The security flaws can be fixed if you upgrade your system(s) to the latest haproxy package, specific to each distribution. To apply the update, run the Update Manager application.
In general, a standard system update will make all the necessary changes. A system restart will not be necessary to implement the changes.