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Advisory ID: SYSS-2019-024
Product: FANUC Robotics Virtual Robot Controller
Manufacturer: FANUC Robotics America, Inc.
Affected Version(s): V8.23
Tested Version(s): V8.23
Vulnerability Type: Stack-based Buffer Overflow (CWE-121) 
Risk Level: High
Solution Status: Open
Manufacturer Notification: 2019-05-22
Solution Date: ?
Public Disclosure: 2019-07-15
CVE Reference: CVE-2019-13585
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 a stack-based buffer overflow, the remote admin web server
(vrimserve.exe) is vulnerable to denial-of-service and remote code
execution 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 buffer overflow vulnerability was discovered in the log viewer
functionality. By sending a specially crafted HTTP request to the HTTP
server, the application can be crashed causing a denial-of-service
condition.

Remote code execution may also be possible, but was not confirmed
by SySS GmbH. Gaining control over the instruction pointer (EIP) of this
32 bit application by exploiting the stack-based buffer overflow
vulnerability was successful.

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Proof of Concept (PoC):

SySS GmbH developed a proof-of-concept exploit that crashes
vrimserve.exe. It is to note that the exploit gives control over the EIP
register, which is an important prerequisite for remote code execution.

curl "http://${target_host}:8090/namedrobots/folder/dir/<1268 bytes>BBBBCCCCCCCCC"

The bytes denoted as B overwrite the EIP register.

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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-2019-024
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2019-024.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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