[ISN] Private crypto keys are accessible to Heartbleed hackers, new data shows

http://arstechnica.com/security/2014/04/private-crypto-keys-are-accessible-to-heartbleed-hackers-new-data-shows/ By Megan Geuss Ars Technica April 12, 2014 Contrary to previous suspicions, it is possible for hackers exploiting the catastrophic vulnerability dubbed Heartbleed to extract private encryption keys from vulnerable websites, Web services firm Cloudflare reported Saturday. As recently as yesterday, Cloudflare published preliminary findings that seemed to indicate that it would be difficult, if not impossible, to use Heartbleed to get the vital key that essentially unlocks the secure sockets layer padlock in millions of browsers. To be extra-sure, Cloudflare launched “The Heartbleed Challenge” to see how other people exploiting Heartbleed might fare. The company set up an nginx server running a Heartbleed-vulnerable version of OpenSSL and invited the Internet at large to steal its private key. Just nine hours later, software engineer Fedor Indutny and Ilkka Mattila at NCSC-FI had obtained the server’s private keys using nothing but the Heartbleed vulnerability. As of this writing, CloudFlare had confirmed a total of four winners: Rubin Xu, a PhD student in the Security group of Cambridge University, as well as security researcher Ben Murphy. The results are a strong indication that merely updating servers to a version of OpenSSL that’s not vulnerable to Heartbleed isn’t enough. Because Heartbleed exploits don’t by default show up in server logs, there’s no way for sites that were vulnerable to rule out the possibility the private certificate key was plucked out of memory by hackers. Anyone possessing the private key can use it to host an impostor site that is virtually impossible for most end users to detect. Anyone visiting the bogus site would see the same https prefix and padlock icon accompanying the site’s authentic server. […]