March 23, 2023, 04:31:37 PM

Author Topic: Vulnerabilities found in Microsoft .NET Passport  (Read 9212 times)

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Offline Metgod

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Vulnerabilities found in Microsoft .NET Passport
« on: May 08, 2003, 03:51:00 PM »
Well I got this fromthe ISN mailing list and I thought I"d make some comments on it. Might be worth a read.. as always.. comments in brackets.. reason I even bother is that maybe someone 'newer' will see this and actually reconsider things.. if not, well, at least I tried.


Subject: [ISN] Multiple Vulnerabilities found in Microsoft .Net Passport Services
PakCERT Security Advisory PC-080503
Multiple Vulnerabilities found in Microsoft .Net Passport Services
May 08, 2003


"Microsoft® .NET Passport is a Web-based service designed to make
signing in to Web sites fast and easy. .NET Passport enables
participating sites to authenticate a user with a single set of
credentials, eliminating the need for users to remember
numerous passwords and sign-in names."

"Since its launch in 1999, Microsoft® .NET Passport has become one of
the largest online authentication systems in the world, with more than
200 million accounts performing more than 3.5 billion authentications
each month. .NET Passport participating sites include NASDAQ, McAfee,, eBay, Cannon, Groove, Starbucks, MSN® Hotmail, MSN
Messenger, and many more."

[The saddest part here is that.. these companies claim that they are secure, but yet, they are relying on other's software. I personally think this is a very bad idea. Rely on continual updates, testing and so on. If you rely on someone else, you'll get bitten hard at the end.. some day. In a way, it's like security through obscurity. Not good.]

Benefits of Using .Net Passport Services

* "Use one name and password to sign in to all .NET
  Passport-participating sites and services."

[Security v. Convenience.. Gee.. I wonder which most pick.. sadly, convenience. Who would really use the same login and passwd for numerous accounts? Hello people.. one login/passwd found.. all login/passwd's found.. ]

* "Store personal information in your .NET Passport profile and, if
  you choose, automatically share that information when you sign in so
  that participating sites can provide you with personalized

[same deal... okay, encryption is probably secure when transferring, but is the method of the actual service reliable and secure ? hard to say.. obviously not here]


PakCERT has discovered two serious vulnerabilities in Microsoft .Net
Passport Services, which if exploited, affects over 200 million users
worldwide. Using these vulnerabilities and the single sign-in feature
of Microsoft .Net Passport, an attacker can completely take control of
a user's account including Hotmail email account, personal
information, credit card numbers, shopping lists etc and use it on any
of the .Net Passport participating web sites.

[guh.. that's scary.. ]
[end of my comments]

Issue One: Bypass Security Questions

An attacker can bypass the security questions asked before resetting
the password. When Microsoft Hotmail/.Net Passport users forget their
passwords, they have to fill out a web form that requires their email
address, state, zip code and country. After submitting the correct
information users are prompted to answer the secret question they
entered during their signup for the service.

As a result of this vulnerability, Microsoft Hotmail/.Net Passport
users who rely on questions like "What's my name?" or "What's my
favorite color?" could find themselves loosing their accounts.

Issue Two: Password Reset Vulnerability

An attacker can reset any Microsoft Hotmail/.Net Passport user account
with no prior information like state, zip, country, answer to the
secret question and the old password. Normally, a user has to answer
the security questions and than answer the secret question if he wants
to reset his password. By exploiting this vulnerability, an attacker
can submit a specially crafted URL to get the password reset
instructions and reset any user's password.


Due to the nature of this vulnerability and the fact that there is no
fix available yet, no technical details are being made available with
this advisory. Full technical details will be made available on our
website once the vulnerability is fixed by Microsoft. Please note that
we were forced to release this information public as these
vulnerabilities are actively being exploited in the wild and are one
of the most severe vulnerabilities ever found in Microsoft
Hotmail/.Net Passport.

FOUND BY:  Qazi Ahmed & Shoaib Rehman

AUTHOR:  Qazi Ahmed


The information within this paper may change without notice. Use of
this information constitutes acceptance for use in an AS IS condition.
There are NO warranties with regard to this information. In no event
shall the author be liable for any damages whatsoever arising out of
or in connection with the use or spread of this information. Any use
of this information is at the user's own risk.

PakCERT Contact Information:

 Phone: +92-21-5872445 – 47
 Fax:   +92-21- 5378505
 Postal Address:
 Office #5, 3rd Floor, Plot No. 6-C
 7th Zamzama Commercial Lane
 Phase-V, D.H.A
 Karachi, Pakistan


"My Terminal is my Soul"

Offline wilnix

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Re:Vulnerabilities found in Microsoft .NET Passport
« Reply #1 on: July 06, 2003, 04:08:57 PM »
M$ vulnerabilities?!? impossible!  :P

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