net/http/proxy_client_socket.cc in Google Chrome before 41.0.2272.76 does not properly handle a 407 (aka Proxy Authentication Required) HTTP status code accompanied by a Set-Cookie header, which allows remote proxy servers to conduct cookie-injection attacks via a crafted response.
https://security.gentoo.org/glsa/201503-12
https://codereview.chromium.org/769043003
https://code.google.com/p/chromium/issues/detail?id=431504
http://www.ubuntu.com/usn/USN-2521-1
http://www.securityfocus.com/bid/72901
http://rhn.redhat.com/errata/RHSA-2015-0627.html
http://googlechromereleases.blogspot.com/2015/03/stable-channel-update.html