CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
EPSS
Percentile
45.2%
CVSS v3 7.4
ATTENTION: Exploitable Remotely / Low skill level to exploit / Public exploits are available
Vendors: Silex Technology, GE Healthcare
Equipment: SX-500, SD-320AN, MobileLink
Vulnerabilities: Improper Authentication, OS Command Injection
This updated advisory is a follow-up to the updated advisory titled ICSMA-18-128-01 Silex Technology SX-500/SD-320AN or GE Healthcare MobileLink (Update A) that was published May 31, 2018, on the NCCIC/ICS-CERT website.
Successful exploitation of these vulnerabilities could allow modification of system settings and remote code execution.
The following products from Silex Technology are affected. Some are not affected by both vulnerabilities (see Mitigations Section):
The following models of GE MAC Resting ECG analysis system may use the vulnerable MobileLink technology:
Authentication is not verified when making certain POST requests, which may allow attackers to modify system settings.
CVE-2018-6020 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).
A system call parameter is not properly sanitized, which may allow remote code execution.
CVE-2018-6021 has been assigned to this vulnerability. A CVSS v3 base score of 7.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L).
Eric Evenchick of Atredis Partners reported these vulnerabilities to Silex and GE and tested pre-release firmware and other mitigations confirming they resolved the vulnerabilities.
Silex Technologies and GE Healthcare recommend the following mitigations:
CVE-2018-6020 (GE MobileLink/SX-500) β Enable the βupdateβ account within the web interface, which is not enabled by default. Set the secondary password for the βupdateβ account to prevent unauthenticated changes to the device configuration.
--------- Begin Update B Part 1 of 1 --------
CVE-2018-6021 (GE MobileLink/GEH-SD-320AN) β Silex Technology and GE Healthcare have produced an updated firmware image (Version 1.14) for the GEH-SD-320AN, which is now available for download at the following location:
<http://silextechnology.com/geh320an/>
GE Healthcare has released a security notice that can be viewed at:
<http://www3.gehealthcare.com/en/support/security>
The firmware update (Version 2.0.3) for SD-320AN is separate from GEH-SD-320AN and is available for download from Silex Technology at the following link:
<https://www.silextechnology.com/connectivity-solutions/device-connectivity/sd-320an>
Note that this update does not pertain to the listed GEH device. Contact Silex Technology for more information regarding download and application of this new firmware.
--------- End Update B Part 1 of 1 --------
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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 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 on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
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.
silextechnology.com/geh320an/
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6020
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6021
www3.gehealthcare.com/en/support/security
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cwe.mitre.org/data/definitions/287.html
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
EPSS
Percentile
45.2%