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Advisory ID: SYSS-2019-025
Product: FANUC Robotics Virtual Robot Controller
Manufacturer: FANUC Robotics America, Inc.
Affected Version(s): V8.23
Tested Version(s): V8.23
Vulnerability Type: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (CWE-22)
Risk Level: Low
Solution Status: Open
Manufacturer Notification: 2019-05-22
Solution Date: ?
Public Disclosure: 2019-07-15
CVE Reference: CVE-2019-13584
Author of Advisory: Sebastian Hamann, SySS GmbH

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Overview:

FANUC Robotics Virtual Robot Controller is an application for
programming simulated industry robots.

Due to an insufficient validation of user input, the HTTP service of
the application is vulnerable to path traversal attacks.

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Vulnerability Details:

vrimserve.exe offers an HTTP service on TCP port 8090, which can be used
to control virtual robots and view their log files.

A path traversal vulnerability was discovered in the log viewer
functionality.

By sending a specially crafted HTTP request to the web server, files and
directories that match the pattern "*.*" can be listed anywhere on the
filesystem. Furthermore, the contents of files named "logfile.txt" can
be read.

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Proof of Concept (PoC):

The string "..%5C" can be used to access the parent directory.

Therefore, by accessing a URL similar to the following, it is possible
to obtain a list of files (and directories with a . in their name) in
the root directory of the C:\ partition (or another partition, depending
on the software installation).

http://${target_host}:8090/namedrobots/folder/dir/..%5C..%5C..%5C..%5C..%5C..%5C..%5C../

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Solution:

The vendor has not yet released a security update.

It is recommended not making the remote admin web server (vrimserve.exe)
available to untrusted networks.

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Disclosure Timeline:

2019-04-23: Vulnerability discovered
2019-05-22: Vulnerability reported to manufacturer
2019-07-15: Public release of SySS security advisory

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References:

[1] Manufacturer website:
    https://www.fanucamerica.com/
[2] SySS Security Advisory SYSS-2019-025
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2019-025.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/

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Credits:

This security vulnerability was found by Sebastian Hamann of SySS GmbH.

E-Mail: sebastian.hamann@syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Sebastian_Hamann.asc
Key ID: 0x9CE0E440429D8B96
Key Fingerprint: F643 DF21 62C4 7C53 7DB2 8BA1 9CE0 E440 429D 8B96

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Disclaimer:

The information provided in this security advisory is provided "as is" 
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS Web
site.

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Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en
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