Natus Xltek NeuroWorks Stack-Based Buffer Overflow, Out-of-Bounds Read (CVE-2017-2869 CVE-2017-2868 CVE-2017-2867 CVE-2017-2861 CVE-2017-2860 CVE-2017-2858 CVE-2017-2853 CVE-2017-2852 )

# ICS Advisory (ICSMA-18-165-01) ## Natus Xltek NeuroWorks Original release date: June 14, 2018 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSMA-18-165-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSMA-18-165-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSMA-18-165-01) ### 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 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 [https://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 10.0** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** Natus Medical, Inc. (Natus) * **Equipment:** Natus Xltek NeuroWorks software * **Vulnerabilities:** Stack-Based Buffer Overflow, Out-of-Bounds Read ## 2\. RISK EVALUATION Successful exploitation of these vulnerabilities require access to the Natus customer network, and could crash the device being accessed; a buffer overflow condition may allow remote code execution. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following version of Natus Xltek NeuroWorks, used in Natus Xltek EEG medical products, are affected: * Natus Xltek NeuroWorks Version 8 ### 3.2 VULNERABILITY OVERVIEW ### 3.2.1 [OUT-OF-BOUNDS READ CWE-125](https://cwe.mitre.org/data/definitions/125.html) A specially-crafted packet may be able to cause an out-of-bounds read, which may result in a denial-of-service condition. [CVE-2017-2852](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2852) 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:N/I:N/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)). ### 3.2.2 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html) An attacker may cause a buffer overflow by sending a specially-crafted packet to the affected product while the product attempts to open a file requested by the client. [CVE-2017-2853](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2853) 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)). ### 3.2.3 [OUT-OF-BOUNDS READ CWE-125](https://cwe.mitre.org/data/definitions/125.html) A specially-crafted packet may cause an out-of-bounds read, which may result in a denial-of-service condition. [CVE-2017-2858](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2858) 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:N/I:N/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)). ### 3.2.4 [OUT-OF-BOUNDS READ CWE-125](https://cwe.mitre.org/data/definitions/125.html) A specially-crafted packet may cause an out-of-bounds read, which may result in a denial-of-service condition. [CVE-2017-2860](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2860) 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:N/I:N/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)). ### 3.2.5 [OUT-OF-BOUNDS READ CWE-125](https://cwe.mitre.org/data/definitions/125.html) A specially-crafted packet may cause an out-of-bounds read, which may result in a denial-of-service condition. [CVE-2017-2861](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2861) 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:N/I:N/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)). ### 3.2.6 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html) A specially-crafted packet received during the execution of certain commands can cause memory to be overwritten in a way that could allow an attacker to take control of the program. [CVE-2017-2867](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2867) has been assigned to this vulnerability. A CVSS v3 base score of 9.0 has been calculated; the CVSS vector string is ([AV:N/AC:H/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:H/PR:N/UI:N/S:C/C:H/I:H/A:H)). ### 3.2.7 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html) An error in the way the program parses data structures may allow an attacker to take control of the system by sending it a specially-crafted packet. [CVE-2017-2868](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2868) 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)). ### 3.2.8 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html) A specially-crafted packet takes advantage of the way the program parses data structures and may cause a buffer overflow, which may allow remote execution of arbitrary code. [CVE-2017-2869](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2869) 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:** Healthcare and Public Health * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Pleasanton, California ### 3.4 RESEARCHER Cory Duplantis from Cisco Talos discovered these vulnerabilities and reported them to Natus. ## 4\. MITIGATIONS Natus has released NeuroWorks/SleepWorks 8.5 GMA 3, a software update with security enhancements to address the vulnerabilities identified in NeuroWorks/SleepWorks 8. A free software update to NeuroWorks/SleepWorks 8.5 GMA 3 is available to users using NeuroWorks/SleepWorks Version 8.0, 8.1, 8.4, or 8.5. Contact the Natus Neuro Technical support department at 1-800 387-7516 or email [Oakville_Technical_Service@natus.com](mailto:mailto:Oakville_Technical_Service@natus.com) for more details. Natus recommends installing this update as quickly as possible on affected systems. NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](/ics/alerts/ICS-ALERT-10-301-01). * 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for [control systems security recommended practices](/ics/content/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](/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-CERT website](/ics/) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](/ics/tips/ICS-TIP-12-146-01B). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target these vulnerabilities.