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AUSCERT External Security Bulletin Redistribution
ESB-2015.2627
3S CODESYS Runtime Toolkit Null Pointer Dereference Vulnerability
19 October 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: 3S CODESYS Runtime Toolkit
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6482
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-288-01
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Advisory (ICSA-15-288-01)
3S CODESYS Runtime Toolkit Null Pointer Dereference Vulnerability
Original release date: October 15, 2015
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 service,
referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the
header. For more information about TLP, see http://www.us-cert.gov/tlp/.
OVERVIEW
Nicholas Miles of Tenable Network Security has identified a NULL
pointer dereference vulnerability in 3S-Smart Software Solutions GmbH's
CODESYS Runtime Toolkit. 3S has produced a new version to mitigate this
vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following CODESYS software versions are affected:
CODESYS Runtime Toolkit, versions prior to Version 2.4.7.48.
IMPACT
Successful exploitation of this vulnerability may allow a remote attacker
to crash the Runtime Toolkit, resulting in a denial of service condition.
Impact to individual organizations depends on many factors that are unique
to each organization. NCCIC/ICS-CERT recommends that organizations evaluate
the impact of this vulnerability based on their operational environment,
architecture, and product implementation.
BACKGROUND
3S-Smart Software Solutions GmbH is headquartered in Kempten, Germany,
and has distributors in more than 10 countries worldwide.
The affected product, CODESYS Runtime Toolkit, is embedded third-party
software. According to 3S, CODESYS is deployed across several sectors
including Critical Manufacturing, Energy, Transportation Systems, and
others. 3S-Smart Software Solutions GmbH estimates that these products
are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
NULL POINTER DEREFERENCE [a]
A crafted request may allow a NULL pointer dereference that could crash
the Runtime Toolkit causing a denial-of-service condition.
CVE-2015-6482 [b] has been assigned to this vulnerability. A CVSS
v3 base score of 7.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
3S-Smart Software Solutions GmbH has released a new version of CODESYS,
Version 2.3.9.48, which contains a new version of the Runtime Toolkit,
Version 2.4.7.48. CODESYS, Version 2.3.9.48 is available at the following
location with a valid user account:
https://www.codesys.com/download/download-center.html
For additional information about the new version of CODESYS or questions
about the vulnerability, the CODESYS Support Team's contact information
is as follows:
https://www.codesys.com/support-training/codesys-support/inquiry-per-phone-e-mail.html
ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:
Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls,
and isolate them from the business network.
When remote access is required, use secure methods, such as Virtual
Private Networks (VPNs), recognizing that VPNs may have vulnerabilities
and should be updated to the most current version available. Also
recognize that VPN is only as secure as the connected devices.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems
security recommended practices on the ICS-CERT web page at:
http://ics-cert.us-cert.gov/content/recommended-practices. Several
recommended practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies.
Additional mitigation guidance and recommended practices are
publicly available in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site
(http://ics-cert.us-cert.gov/).
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
a.
CWE-476: NULL Pointer Dereference,
http://cwe.mitre.org/data/definitions/476.html, web site last accessed
October 15, 2015.
b.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6482,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
c.
CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed October 15, 2015.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
this product.
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