48 lines
No EOL
1.8 KiB
Text
48 lines
No EOL
1.8 KiB
Text
source: https://www.securityfocus.com/bid/3420/info
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Microsoft Internet Explorer contains a security-setting feature that can be modified according to a user's preferences. These settings control what actions a web site can take on a user's system.
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A vulnerability exists in Internet Explorer, which could allow a web site to be viewed in the Local Intranet Zone, rather than the Internet Zone. Thus, allowing content to be viewed with less-restrictive security settings.
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Converting the IP address of the target web site into a dotless IP address, and submitting it, will cause Internet Explorer to view the web site in the Local Intranet zone.
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* Microsoft Security Bulletin MS01-055 states that there is a new variant of this issue, although no technical details have been provided. A cumulative patch has been released and IE 5.5 users are encouraged to install it.
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Example:
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An option in a basic authenticated site is to pass on a username (and/or
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password) in the URL like this:
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http://mike@msdn.microsoft.com
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Another possibility is to convert an IP address into a dotless IP address;
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such an address is also called a DWORD address (some proxy servers, routers
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or web servers do not allow this).
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http://msdn.microsoft.com - IP: 207.46.239.122
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Convert this IP address to a DWORD address:
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207 * 16777216 = 3472883712
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46 * 65536 = 3014656
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239 * 256 = 61184
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122 * 1 = 122
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------------------------------------------------ +
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= 3475959674
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This DWORD address can be used to visit the site like:
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http://3475959674
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If we combine the URL login option with the DWORD IP address we'll get the
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following URL:
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http://mike@3475959674
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The browser still thinks we are in the internet zone as expected.
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Now we change the @ sign to its ASCII equivalent (%40):
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------------------------
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http://mike%403475959674
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