19 March 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.0672 Honeywell XL Web Controller Directory Traversal Vulnerability 19 March 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Honeywell XL Web Controller Publisher: US-CERT Operating System: Linux variants Impact/Access: Administrator Compromise -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-0984 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-15-076-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-15-076-02) Honeywell XL Web Controller Directory Traversal Vulnerability Original release date: March 17, 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 Martin Jartelius of Outpost24 has identified a directory traversal vulnerability in Honeywells XL Web Controller. Honeywell has produced an update that mitigates this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS The following XLWeb controller versions are affected: XL1000C50 EXCEL WEB 52 I/O, XL1000C100 EXCEL WEB 104 I/O, XL1000C500 EXCEL WEB 300 I/O, XL1000C1000 EXCEL WEB 600 I/O, XL1000C50U EXCEL WEB 52 I/O UUKL, XL1000C100U EXCEL WEB 104 I/O UUKL, XL1000C500U EXCEL WEB 300 I/O UUKL, and XL1000C1000U EXCEL WEB 600 I/O UUKL. IMPACT An attacker may use this vulnerability to generate a valid login for an administrative user on the Honeywell XLWeb controller giving the attacker full administrator access to the system. The XLWEB application effectively becomes an entry point into the network where it is located. 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 Honeywell is a US-based company that maintains offices worldwide. The affected products, XLWeb controllers, are web-based SCADA systems. According to Honeywell, XLWeb controllers are deployed across several sectors including Critical Manufacturing, Energy, Water and Wastewater Systems, and others. Honeywell estimates that these products are used primarily in Europe and the Middle East. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW PATH TRAVERSAL[a] By using a directory traversal vulnerability in the FTP server, it is possible to gain access to the web root directory. CVE-2015-0984[b] has been assigned to this vulnerability. A CVSS v2 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).[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 The update for this vulnerability is Excel Web Linux version 2.04.01 (March, 2014) or later plus the programing tool CARE version 10.02 (March 2014) or later. Customers are encouraged to contact their local Honeywell HBS branch to have their sites updated to the latest version. In the Centraline partner channel, Excel Web controllers also have been sold under the brand name FALCON. Centraline partners can directly access http://www.centraline.com and get these versions. Linux: https://www.centraline.com/index.php?id=847&route=article/index&directory_id=140&direct_link=1 CARE: https://www.centraline.com/index.php?id=847&route=article/index&directory_id=138&direct_link=1 ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. 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 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. Additional mitigation guidance and recommended practices are publicly available in the ICSCERT 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/). a. CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), http://cwe.mitre.org/data/definitions/22.html, web site last accessed March 17, 2015. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0984, 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, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web site last accessed March 17, 2015. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: firstname.lastname@example.org Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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