# ICS Advisory (ICSA-19-255-01)
## 3S-Smart Software Solutions GmbH CODESYS V3 Web Server
Original release date: September 12, 2019
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### Legal Notice
All information products included in [https://us-cert.gov/ics](/ics) are
provided "as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
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this product is governed by the Traffic Light Protocol (TLP) marking in the
header. For more information about TLP, see [https://www.us-
cert.gov/tlp/](/tlp/).
* * *
## 1\. EXECUTIVE SUMMARY
* **CVSS v3 10.0**
* **ATTENTION:** Exploitable remotely/low skill level to exploit
* **Vendor:** 3S-Smart Software Solutions GmbH
* **Equipment:** CODESYS V3 web server
* **Vulnerabilities:** Path Traversal, Stack-based Buffer Overflow
## 2\. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow an attacker to
create a denial-of-service condition, to perform remote code execution, or to
access restricted files.
## 3\. TECHNICAL DETAILS
### 3.1 AFFECTED PRODUCTS
The following CODESYS V3 runtime systems, all versions prior to 3.5.14.10,
containing the web server (CmpWebServer) are affected:
* CODESYS Control for BeagleBone
* CODESYS Control for emPC-A/iMX6
* CODESYS Control for IOT2000
* CODESYS Control for Linux
* CODESYS Control for PFC100
* CODESYS Control for PFC200
* CODESYS Control for Raspberry Pi
* CODESYS Control RTE V3
* CODESYS Control RTE V3 (for Beckhoff CX)
* CODESYS Control Win V3 (also part of the CODESYS Development System setup)
* CODESYS HMI V3
* CODESYS Control V3 Runtime System Toolkit
* CODESYS V3 Embedded Target Visu Toolkit
* CODESYS V3 Remote Target Visu Toolkit
In CODESYS V3, the web server is an optional part of the CODESYS runtime
system.
### 3.2 VULNERABILITY OVERVIEW
#### 3.2.1 [IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
TRAVERSAL') CWE-22](https://cwe.mitre.org/data/definitions/22.html)
Specially crafted http or https requests may allow an attacker access to files
outside the restricted working directory of the controller.
[CVE-2019-13532](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13532)
has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been
calculated; the CVSS vector string is
([AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)).
#### 3.2.2 [STACK-BASED BUFFER OVERFLOW
CWE-121](https://cwe.mitre.org/data/definitions/121.html)
Specially crafted http or https requests could cause a stack overflow, which
may create a denial-of-service condition or allow remote code execution.
[CVE-2019-13548](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13548)
has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been
calculated; the CVSS vector string is
([AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)).
### 3.3 BACKGROUND
* **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing
* **COUNTRIES/AREAS DEPLOYED:** Worldwide
* **COMPANY HEADQUARTERS LOCATION:** Germany
### 3.4 RESEARCHER
Ivan Cheyrezy of Schneider Electric reported this vulnerability to 3S-Smart
Software Solutions GmbH.
## 4\. MITIGATIONS
3S-Smart Software Solutions GmbH has released Versions 3.5.12.80, 3.5.14.10,
and 3.5.15.0 to resolve the vulnerabilities for the affected CODESYS products.
Please visit the CODESYS update page for more information on how to obtain the
software update: <https://www.codesys.com/download/>[
](https://www.codesys.com/download/)
Updating to Version 3.5.14.10 or higher is recommended over Version 3.5.12.80,
which does not resolve the vulnerabilities for all affected products. Further
details from 3S-Smart Software Solutions GmbH can be found in a security
report at the following link:
<https://www.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-01_CDS-64543.pdf>
As part of a security strategy, 3S-Smart Software Solutions GmbH recommends
the following general defense measures to reduce the risk of exploits:
* Use controllers and devices only in a protected environment to minimize network exposure and ensure that they are not accessible from outside.
* Use firewalls to protect and separate the control system network from other networks.
* Use VPN (virtual private networks) tunnels if remote access is required.
* Activate and apply user management and password features.
* Limit the access to both development and control system by physical means, operating system features, etc.
* Protect both development and control system by using up-to-date virus detecting solutions. For more information and general recommendations for protecting machines and plants, see also the CODESYS security whitepaper at <https://customers.codesys.com/fileadmin/data/customers/security/CODESYS-Security-Whitepaper.pdf>
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for [control systems security recommended
practices](https://www.us-cert.gov/ics/recommended-practices) on the ICS
webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended
practices are available for reading and download, including [Improving
Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies](https://www.us-
cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-
CERT_Defense_in_Depth_2016_S508C.pdf).
Additional mitigation guidance and recommended practices are publicly
available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in
the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion
Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS-
TIP-12-146-01B).
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
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