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Multiple products allow Cross Site Scripting and log spoofing
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Secunia Advisory:
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SA8275
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Release Date:
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2003-03-12
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Last Update:
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2004-08-25
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Popularity:
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11,972 views
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Critical:
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Less critical
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Impact:
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Security Bypass
Cross Site Scripting
Spoofing
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Where:
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From remote
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Solution Status:
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Partial Fix
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| Software: | Apache 1.3.x
Apache 2.0.x
Logan Pro 1.x
Sun Java System Web Server (Sun ONE/iPlanet) 6.x
SurfStats 6.x
WebExpert 5.x
WebTrends 6.x
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Description:
Various techniques have been identified to use DNS to perform Cross Site Scripting and to spoof an IP address in web server log files and log analysers.
It is required that the web server or log analyser has been configured to perform reverse DNS lookups.
The problem is that various software will accept any answer from the DNS server. If the DNS server replies with a hostname that looks like an IP address ie. "192.168.12.5" then it would appear as a legit IP address, when in fact the real IP address was something completely different.
Apache allows this kind of injection into access logs. Any errors recorded in the error log would contain the real IP address.
iPlanet allows spoofing of IP addresses using this technique. It was also possible to completely hide requests.
WebTrends, Surfstats and Webexpert has been found vulnerable to Cross Site Scripting using a similar technique. By returning a hostname that contains a malicious client side script it is possible to perform Cross Site Scripting.
Furthermore, Logan Pro and Webexpert has been found vulnerable to an older Cross Site Scripting issue, by not verifying the User Agent parameter, this allows malicious users to inject client side scripts.
Solution:
We recommend that you disable reverse lookup for your web server, to make sure that visitors leave useful data in your log files.
If you would like to enable reverse lookups for you web log analyser, we recommend that you change the security zone settings in your browser, so that client side scripting isn't allowed on the host serving the log analyser.
Provided and/or discovered by:
Hugo Vázquez Caramés & Toni Cortés Martínez
Changelog:
2004-08-25: The vulnerability has been fixed in some of the listed products. See product specific advisories for fixes.
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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