[NT] Norton Internet Security Blocked Sites XSS
From: SecuriTeam (support_at_securiteam.com)
Date: 10/28/03
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To: list@securiteam.com Date: 28 Oct 2003 16:56:57 +0200
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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Norton Internet Security Blocked Sites XSS
------------------------------------------------------------------------
SUMMARY
<http://www.symantec.com/sabu/nis/nis_pe/index.html> Symantec's Norton
Internet Security 2003 "provides essential protection from viruses,
hackers, and privacy threats. Powerful yet easy to use, this award-winning
suite now includes advanced spam-fighting software to filter unwanted mail
out of your inbox".
A cross site scripting vulnerability in the product allows remote
attackers to cause the product to return arbitrary HTML and/or JavaScript
inside its Blocked HTML page as if it was the product's HTML and/or
JavaScript.
DETAILS
Vulnerable systems:
* Norton Internet Security 2003 version 6.0.4.34
When Norton Internet Security 2003 blocks a web site, it returns a web
page to the browser stating that the site has been blocked. This error
message contains the URL that was requested. Norton Internet Security 2003
appears to do no validation or encoding of the URL before returning it in
the error message. This allows an attacker to supply a URL that contains
script. This script will run in the context of the blocked site.
The HTML returned by Norton Internet Security 2003 when a site is blocked
looks like the following:
< html>< head>< title>Site Blocked</title></head><body>
< br>< b>Norton Internet Security has blocked access to this restricted
site.</b><br><hr><br>
< p>< b>Site:
</b>http://server/page.cgi?< SCRIPT>alert(document.domain)</SCRIPT></p>
< p>< b>Blocked categories: </b>xxxxxxxxx</p>
< p>If you think this web site is incorrectly categorized, visit the
Symantec < a
href="http://www.symantec.com/avcenter/cgi-bin/nisurl.cgi?lang=EN&unblock=xxxxxxxxx">Internet
Security Center</a> to report it.</p>
</body></html>
Exploit:
A URL like http://BlockedSite/page.cgi?<
SCRIPT>alert(document.domain)</SCRIPT> will run script.
Resolution:
The fix is now available through the product's LiveUpdate functionality.
ADDITIONAL INFORMATION
The information has been provided by
<mailto:secteam@DIGITALPRANKSTERS.COM> DigitalPranksters.
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