The infrastructure of the Fedora Project was compromised over the weekend and an account belonging to a Fedora contributor was taken over by an attacker. However, Fedora officials said they don t believe that the attacker was able to push any changes to the Fedora package system or make any actual changes. The attack appears to have targeted one specific user account, which had some high-value privileges. The contributor knew that he had not changed his account settings, so he contacted the Fedora Infrastructure Team, which investigated the incident.
Source: https://threatpost.com/fedora-system-compromised-no-changes-made-012511/74877/