Microsoft Internet Explorer '%2F' URL Parsing Error Lets Remote Users Spoof Sites in the Trusted Zone
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SecurityTracker Alert ID: 1010482
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SecurityTracker URL: http://securitytracker.com/id?1010482
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jun 13 2004
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Impact: Modification of system information
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Exploit Included: Yes
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Version(s): 6
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Description: A vulnerability was reported in Microsoft Internet Explorer in the parsing of URLs containing the '%2F' character. A remote user can spoof Trusted Site and Local Computer zone URLs.
http-equiv reported that 'bitlance winter' discovered that a remote user can create a specially crafted HTML link that, when loaded
by the target user, will cause an arbitrary web site to be loaded with a partially spoofed URL. The partially spoofed URL will
contain the full URL but may also contain space or null characters that cause the portion of the URL containing the attacker's site
to be pushed far enough to the right in the URL status bar so as to not be visible.
The web site can be loaded in the security
domain of an arbitrary site. As a result, a remote user can spoof arbitrary web sites in the target user's trusted sites security
domain.
A demonstration exploit link is provided:
<a href="http://www.microsoft.com%2F redir=www.e-gold.com">test</a>
It
is reported that the attacker's exploit site must be configured to respond to HTTP queries regardless of what value is specified
for the HTTP "Host:" header.
Thor Larholm reported that a remote user can also cause the HTML to load in the Local Intranet zone
by leaving out a top level domain in the first part of the URL. Some demonstration exploit examples are provided:
http://whatever%3fredir=www.e-gold.com
http://whate
ver%3fredir=yourevilsite.com
Brett Moore reported that the malicious URL does not need to include the 'redir' attribute.
A
demonstration exploit example that uses an SSL-based exploit site is provided at:
http://www.malware.com/gutted.html
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Impact: A remote user can create HTML that, when loaded by the target user, will spoof an arbitrary site in the target user's trusted domain or local computer domain.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.microsoft.com/technet/security/ (Links to External Site)
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Cause: Input validation error, State error
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Underlying OS: Windows (Any)
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Reported By: "http-equiv@excite.com" <1@malware.com>
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Message History:
None.
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Source Message Contents
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Date: Thu, 10 Jun 2004 20:35:03 -0000
From: "http-equiv@excite.com" <1@malware.com>
Subject: [Full-Disclosure] COELACANTH: Phreak Phishing Expedition
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Thursday, June 10, 2004
The following was presented by 'bitlance winter' of Japan today:
<a href="http://www.microsoft.com%2F redir=www.e-
gold.com">test</a>
Quite inexplicable from these quarters. Perhaps someone with
server 'knowledge' can examine it.
It carries over the address into the address bar:
[screen shot: http://www.malware.com/gosh.png 72KB]
while redirecting to egold. The key being %2F without that it
fails. The big question is where is the 'redir' and why is it
only applicable [so far] to e-gold. Other sites don't work and e-
gold is running an old Microsoft-IIS/4.0.
Working Example:
http://www.malware.com/golly.html
credit: 'bitlance winter'
End Call
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http://www.malware.com
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Charter: http://lists.netsys.com/full-disclosure-charter.html
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