Information
---------------------------------
Name :  XSS  Vulnerability in WEIBO.COM
Vendor Homepage :  http://corp.sina.com.cn/eng/sina_index_eng.htm
Vulnerability Type :  Cross-Site Scripting
Severity :  High
Researcher :  Yuping Li at ADLab of Beijing Leadsec Technology Co., Ltd


Description
---------------------------------
WEIBO.COM is the largest twitter-like website in China, which claimed to
have more than 200 million users in 2011. It was operated by SINA
Corporation (USA, Nasdaq: Sina), which is an online media company for China
and Chinese Community around the world. Weibo is one of SINA's four major
business lines.


Details
---------------------------------
ADLab (Leadsec) has discovered vulnerability in WEIBO.COM, which can be
exploited to perform cross-site scripting attacks, potentially affect large
number of users.

Example PoC urls are as follows :

    http://weibo.com/mobile/cellphone?ky=iphone
"><script>alert('test')</script>&refer=help

Actually, the refer parameter can be removed :

    http://weibo.com/mobile/cellphone?ky=
</title>"><script>alert('test')</script>

Successful exploitation of this vulnerability requires that victim is
logged-in to the vulnerable website.


Solution
---------------------------------
Fix the code.


Advisory Timeline
--------------------
06/01/2012 - First indirectly contact: Sent the vulnerability details
09/01/2011 - Vulnerability partially fixed, still vulnerable
12/01/2012 - Second directly contact: Sent the vulnerability details
13/02/2012 - Vulnerability Released


Credits
---------------------------------
Attack and Defense Lab, Beijing Leadsec Technology Co., Ltd (
http://www.leadsec.com.cn/en/index.html)


References
---------------------------------
Vendor Url : http://corp.sina.com.cn/eng/sina_index_eng.htm


Disclaimer
---------------------------------
The information provided in this advisory is provided as it is without any
warranty. Leadsec disclaims all warranties,
either expressed or implied, including the warranties of merchantability
and capability for a particular purpose. Leadsec
or its suppliers are not liable in any case of damage, including direct,
indirect, incidental, consequential loss of business
profits or special damages, even if Leadsec or its suppliers have been
advised of the possibility of such damages. Some
countries do not allow the exclusion or limitation of liability for
consequential or incidental damages so the foregoing limitation
may not apply. Any modified copy or reproduction, including partially
usages, of this file requires authorization from Leadsec.
Permission to electronically redistribute this alert in its unmodified form
is granted. All other rights, including the use of
other media, are reserved by Leadsec or its suppliers.

                                               Copyright © 2012 | Beijing
Leadsec Technology Co., Ltd