Google Chrome before 28.0.1500.71 on Mac OS X does not ensure a sufficient source of entropy for renderer processes, which might make it easier for remote attackers to defeat cryptographic protection mechanisms in third-party components via unspecified vectors.
https://code.google.com/p/chromium/issues/detail?id=242702
http://googlechromereleases.blogspot.com/2013/07/stable-channel-update.html