[NEWS] Cross Site Scripting in Yacy

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To: list@securiteam.com
Date: 27 Dec 2004 10:11:31 +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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  Cross Site Scripting in Yacy
------------------------------------------------------------------------

SUMMARY

 <http://www.yacy.net/yacy/> YACY is "a Java Freeware P2P-Based Search
Engine with Caching HTTP Proxy". Due to improper input filtering, YACY is
vulnerable to Cross Site Scripting attacks.

DETAILS

Vulnerable Systems:
 * Yacy version 0.31

Immune Systems:
 * Yacy version 0.32

Some of the input field are not filtered by the server so the input will
appear in the returned page. This allows a malicious attacker to run
JavaScript or other scripting language on a client's browser.

Proof of Concept:
To test the vulnerability, try for example:
http://[host]:8080/index.html?urlmaskfilter=<script>alert(document.cookie)</script>
http://[host]:8080/Wiki.html?page=<script>alert(document.cookie)</script>

Vendor Status:
The vendor has released version 0.32 which address this issue.

ADDITIONAL INFORMATION

The information has been provided by <mailto:fdonato@autistici.org>
Donato Ferrante.

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