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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.0340 Advisory (ICSA-17-033-01) Honeywell XL Web II Controller Vulnerabilities 6 February 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Honeywell XL Web II Controller Publisher: ICS-CERT Operating System: Linux variants Impact/Access: Access Confidential Data -- Remote/Unauthenticated Unauthorised Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-5143 CVE-2017-5142 CVE-2017-5141 CVE-2017-5140 CVE-2017-5139 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-033-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-033-01) Honeywell XL Web II Controller Vulnerabilities Original release date: February 02, 2017 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 Independent researcher Maxim Rupp has identified vulnerabilities in Honeywells XL Web II controller application. Honeywell has produced a new version to mitigate these vulnerabilities. These vulnerabilities could be exploited remotely. AFFECTED PRODUCTS The following XL Web II controller versions are affected: XL1000C500 XLWebExe-2-01-00 and prior, and XLWeb 500 XLWebExe-1-02-08 and prior. IMPACT An attacker may use these vulnerabilities to expose a password by accessing a specific URL. The XL Web II controller 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 these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Honeywell is a US-based company that maintains offices worldwide. The affected products, XL Web II controllers, are web-based SCADA systems. According to Honeywell, XL Web II 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 PLAINTEXT STORAGE OF A PASSWORD[a] Any user is able to disclose a password by accessing a specific URL. CVE-2017-5139[b] has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[c] INSUFFICENTLY PROTECTED CREDENTIALS[d] Password is stored in clear text. CVE-2017-5140[e] has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[f] SESSION FIXATION[g] An attacker can establish a new user session, without invalidating any existing session identifier, which gives the opportunity to steal authenticated sessions. CVE-2017-5141[h] has been assigned to this vulnerability. A CVSS v3 base score of 6.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L).[i] IMPROPER PRIVILEGE MANAGEMENT[j] A user with low privileges is able to open and change the parameters by accessing a specific URL. CVE-2017-5142[k] has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L).[l] PATH TRAVERSAL[m] A user without authenticating can make a directory traversal attack by accessing a specific URL. CVE-2017-5143[n] has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L).[o] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with a low skill would be able to exploit these vulnerabilities. MITIGATION Honeywell has developed Version 3.04.05.05 to fix the vulnerabilities in the XL Web II controllers. Users are encouraged to contact the 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. Users can obtain the latest versions by contacting Centraline: https://www.centraline.com/enGB/centraline/contact.html (link is external) 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. 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 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. 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-256: Plaintext Storage of a Password, https://cwe.mitre.org/data/definitions/256.html, web site last accessed February 02, 2017. b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5139, 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 February 02, 2017. d. CWE-522: Insufficiently Protected Credentials https://cwe.mitre.org/data/definitions/522.html, web site last accessed February 02, 2017. e. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5140, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. 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 February 02, 2017. g. CWE-384: Session Fixation, https://cwe.mitre.org/data/definitions/384.html, web site last accessed February 02, 2017. h. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5141, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. i. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S..., web site last accessed February 02, 2017. j. CWE-269: Improper Privilege Management, https://cwe.mitre.org/data/definitions/269.html, web site last accessed February 02, 2017. k. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5142, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. l. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S..., web site last accessed February 02, 2017. m. CWE-23: Relative Path Traversal, https://cwe.mitre.org/data/definitions/23.html, web site last accessed February 02, 2017. n. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5143, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. o. 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 February 02, 2017. - --------------------------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 auscert@auscert.org.au 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. 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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: auscert@auscert.org.au 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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