Enterprise IT vendors are rushing to protect users from the Heartbleed bug, which has been found in some servers and networking gear and could allow attackers to steal critical data -- including passwords and encryption keys -- from the memories of exposed systems. Hewlett-Packard, Dell, and IBM have set up pages that identify hardware and software products affected by Heartbleed, which exposes a critical defect in certain versions of OpenSSL, a software library for secure communication over the Internet and networks.