spent one morning looking at Yahoo's mail security ...here's what I've found and how I did it.....
I created an account whilst dialed into sify(ISP). I logged out and closed my browser. On reopening the browser I pasted in the following URL:
and this took me back to my account with out any error messages or prompts for a login. I then closed my browser, disconnected from SIFY (ISP)and dialed into Sancharnet(ISP). When connected I opened my browser and pasted th e same URL:And was taken back to my mail-box! This made me think there must be a cookie controlling this...sure enough there it was. (1 of 3)
One, the firstname.lastname@example.org cookie in the rough looks like this :
but with all the Hex stripped out it slightly more managable:
id=reIvr96lzVC4g &< br>sid=tMZu7cDVk5V9e%0a &
farm=1 & silo=ms4 & email@example.com &
head=brief & fwd=attach & fontsz=normal &
msgwidth=72 & o rder=down & inc=50 & goto=msg
After being logged off for around an hour I reconnected to the Internet and pasted that URL again and got back in......this made me suspic ious. I clicked on exit and checked the whole "exit" document. Down the bottom I found a link :
Log off completely.
Nice of them to warn you and put it way down the bottom. Most new users will not realise that the log off process is a double actio n...if you log off "completely" then the cookie is removed from the Temporay Internet Files directory.
What does all this mean ?
Security wise if you can get physical access to a machine that someone has used to collect their mail and not done the d ouble log off then you can
access their account perhaps ad infinitum. (I don't know yet if the cookie has a TTL so to speak.) In practice this means you'll be cracking a friend's,work (or school) colleague's or family member's account. Good for s nooping on your girlfriend's e-mail activities too.... . Unfortunately you can't copy it to a floppy disk and save it in your own computer's Temporary Internet Files directory because of the ":" ...What you'd need to do is copy it to a flo ppy anyway...so you've got what info you need...then, now here's the complicated part :
Set your own PC up as a webserver as well as a DNS server (if you've got NT Server your laughing). Create a DNS entry for mail.yahoo.com and use the loopback (127.0. 0.1). Then create an htm file with the necessary script to impart a cookie with this same information. Connect to mail.yahoo.com (you'll actually loopback) and the cookie will be downloaded to the Temp Net files Directory....
A big hassle to do... probably easier to watch them type their password ;o) but it's knowing how it can be done..that's the important thing. Btw, just for any of you jokers out there...I've modified the security identifier and the e-mail account name etc....I'm not gonna give yo u a copy of my real cookie then tell you how to exploit it...get real ;o) There'll be other ways to crack yahoo, of course....this is just my offering on the matter...for now anyway.