Google Chrome before 28.0.1500.71 does not properly prevent pop-under windows, which allows remote attackers to have an unspecified impact via a crafted web site.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17216
https://code.google.com/p/chromium/issues/detail?id=252216
http://www.debian.org/security/2013/dsa-2724
http://googlechromereleases.blogspot.com/2013/07/stable-channel-update.html