计算机网络技术

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网络技术是从1990年代中期发展起来的新技术,它把互联网上分散的资源融为有机整体,实现资源的全面共享和有机协作,使人们能够透明地使用资源的整体能力并按需获取信息。

Google Covert Redirect Vulnerability Based on Goog

白帽子计算机安全:

Bypass Google Open Redirect Filter Based on Googleads.g.doubleclick.net

-- Google Covert Redirect Vulnerability Based on Googleads.g.doubleclick.net



The vulnerability exists at "Logout?" page with "&continue" parameter, i.e.

https://www.google.com/accounts/Logout?service=writely&continue=https://googleads.g.doubleclick.net

The vulnerability can be attacked without user login. Tests were performed on Firefox (26.0) in Ubuntu (12.04) and IE (9.0.15) in Windows 7.










(1) When a user is redirected from Google to another site, Google will check whether the redirected URL belongs to domains in Google's whitelist (The whitelist usually contains websites belong to Google), e.g.

docs.google.com

googleads.g.doubleclick.net

If this is true, the redirection will be allowed.

However, if the URLs in a redirected domain have open URL redirection  vulnerabilities themselves, a user could be redirected from Google to a vulnerable URL in that domain first and later be redirected from this vulnerable site to a malicious site. This is as if being redirected from Google directly.

One of the vulnerable domain is,

googleads.g.doubleclick.net (Google's Ad System)



(2) Use one webpage for the following tests. The webpage address is "http://www.inzeed.com/kaleidoscope". We can suppose that this webpage is malicious.


Vulnerable URL:

https://www.google.com/accounts/Logout?service=writely&continue=https://google.com/




POC:

https://www.google.com/accounts/Logout?service=wise&continue=http%3A%2F%2Fgoogleads.g.doubleclick.net%2Faclk%3Fsa%3DL%26ai%3DCtHoIVxn3UvjLOYGKiAeelIHIBfLQnccEAAAQASAAUNTx5Pf4_____wFgvwWCARdjYS1wdWItMDQ2NjU4MjEwOTU2NjUzMsgBBOACAKgDAaoE5AFP0NHr5cHwFmWgKNs6HNTPVk7TWSV-CDHX83dKdGSWJ2ADoZNIxUHZwjAODRyDY_7nVtpuqSLOTef4xzVxDQ2U22MNbGak33Ur7i2jDB8LdYt9TbC3ifsXmklY5jl3Zpq4_lP7wagVfjt0--tNPPGTR96NGbxgPvfHMq9ZsTXpjhc_lPlnyGjlWzF8yn437iaxhGRwYLt_CymifLO2YaJPkCm9nLpONtUM-mstUSpKQrP2VjjaZkbDtuK0naLLBV37aYEY4TzWQi8fQGN47z4XgpinBCna91zQayZjn2wxccDCl0zgBAGgBhU%26num%3D0%26sig%3DAOD64_3Qi4qG3CRVHRI5AHSkSGuL7HJqSA%26client%3Dca-pub-0466582109566532%26adurl%3Dhttp%3A%2F%2Fwww.inzeed.com%2Fkaleidoscope




POC Video:

https://www.youtube.com/watch?v=btuSq89khcQ&feature=youtu.be




Reporter:

Wang Jing, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore.

http://www.tetraph.com/wangjing









Related Articles:

http://computerobsess.blogspot.com/2014/11/google-covert-redirect-vulnerability.html

  http://www.hotforsecurity.com/blog/googles-doubleclick-advertising-platform-vulnerable-to-open-redirect-attacks-10822.html 
  http://seclists.org/fulldisclosure/2014/Nov/29 
  http://cxsecurity.com/issue/WLB-2014110106 
  http://securityrelated.blogspot.sg/2014/11/covert-redirect-vulnerability-based-on.html 
  http://tetraph.com/security/covert-redirect/google-covert-redirect-vulnerability-based-on-googleads-g-doubleclick-net/   http://lifegrey.tumblr.com/post/103787782054/whitehatview-googles-doubleclick-advertising

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