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TUCoPS :: Security App Flaws :: bt1344.txt

Norton Internet Security 2003 XSS

DigitalPranksters Security Advisory

Norton Internet Security Blocked Sites XSS 

Risk: Low

Product: Norton Internet Security 2003 v6.0.4.34 (Maybe others we only 
tested this version)

Product URL:

Found By: KrazySnake -

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 which 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.

We have marked this as a low risk because we believe in most situations, 
there will be little information of interest since the site is normally 
blocked (browser cookies from the blocked site probably do not exist, 
etc). However this does allow sites that are blocked to run script on the 
victim's machine when it shouldn't be allowed.

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
<p><b>Blocked categories: </b>xxxxxxxxx</p>
<p>If you think this web site is incorrectly categorized, visit the
Symantec <a 
Security Center</a> to report it.</p>

Proof of Concept:
A URL like 
http://BlockedSite/page.cgi?<SCRIPT>alert(document.domain)</SCRIPT> will 
run script.

The fix is now available through the product's LiveUpdate functionality.

SkippyInside, AngryB, and Harmo. 
Thanks to Symantec for fixing this issue.

Standard disclaimer applies. The opinions expressed in this advisory are 
our own and not of any company. The information within this advisory 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.

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