[NEWS] MSN Contact List Disclosure

From: support@securiteam.com
Date: 02/11/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 11 Feb 2002 19:54:27 +0100 (CET)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  MSN Contact List Disclosure
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SUMMARY

A security vulnerability in the way MSN handles deleted accounts has been
discovered. This vulnerability would allow an attacker to impersonate
another user without anyone of his contacts knowing about it.

DETAILS

Exploit:
Register an account for MSN messenger, make some contact email addresses,
leave the account for 31 days. On a different machine (to ensure there is
no cache), go to the sign up section of MSN messenger, sign up again,
using the same screen name. You will be able to see the previous user's
contact list.

None of the contacts will have been alerted to the fact that the new
username actually belongs to an entirely different person, so they'll
still be sending messages, and if the new user is a haxor, (s)he'll be
replying just as if (s)he's the original user.

ADDITIONAL INFORMATION

The information has been provided by <mailto:h_bugtraq@yahoo.com> Tom
Micklovitch.

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