You may have heard that a new critical vulnerability has been identified that has affected many Internet Web servers – specifically those that use certain versions of “Open SSL” as a means of encrypting user sessions. We have inspected all ManageOps.com Web sites, and verified that none of our sites have this vulnerability. However, it is possible that other Web sites you use on a regular basis are, or were, vulnerable. You can find a list of the top 1000 Web sites and their status (“vulnerable” / “not vulnerable”) as of roughly 12:00 UTC yesterday at https://github.com/musalbas/heartbleed-masstest/blob/master/top1000.txt. It is possible that many of the sites listed as “vulnerable” at the time have since patched their servers. However, if you have accounts on any of these sites – and the “vulnerable” list includes some high-profile sites such as yahoo.com, flickr.com, okcupid.com, slate.com, and eventbrite.com – you should immediately change your passwords.
There is also a useful tool available at http://filippo.io/Heartbleed/ that will allow you to check out a Web site if you are unsure whether or not it is vulnerable.
For the more technical in the crowd who are wondering how this vulnerability affects Web security, it allows an attacker to extract data from the memory of a Web server in up to 64K chunks. That may not sound like much, but if enough 64K chunks are extracted, useful information can be reconstructed, including username/password combinations, and even the private encryption key of the server itself. http://www.mysqlperformanceblog.com/2014/04/08/openssl-heartbleed-cve-2014-0160/ contains a list of the specific versions of OpenSSL that are vulnerable to this exploit.