Google Chrome before displays a cached certificate for a (1) 4xx or (2) 5xx CONNECT response page returned by a proxy server, which allows man-in-the-middle attackers to spoof an arbitrary https site by letting a browser obtain a valid certificate from this site during one request, and then sending the browser a crafted 502 response page upon a subsequent request.

Related Vulnerabilities

platform vulnerability
CVE-2009-2071 webkit
CVE-2009-2071 chromium-browser