10 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.1 High
AI Score
Confidence
Low
0.002 Low
EPSS
Percentile
54.2%
Successful exploitation of these vulnerabilities could allow an attacker to receive sensitive information, execute application programmable interface (API) requests, or hijack devices.
The following versions of Nexx Smart Home devices are affected:
3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798
The listed versions of Nexx Smart Home devices use hard-coded credentials. An attacker with unauthenticated access to the Nexx Home mobile application or the affected firmware could view the credentials and access the MQ Telemetry Server (MQTT) server and the ability to remotely control garage doors or smart plugs for any customer.
CVE-2023-1748 has been assigned to this vulnerability. A CVSS v3 base score of 9.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L).
3.2.2 AUTHORIZATION BYPASS THROUGH USER-CONTROLLED KEY CWE-639
The listed versions of Nexx Smart Home devices lack proper access control when executing actions. An attacker with a valid NexxHome deviceId could send API requests that the affected devices would execute.
CVE-2023-1749 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:L/UI:N/S:U/C:N/I:H/A:N).
3.2.3 AUTHORIZATION BYPASS THROUGH USER-CONTROLLED KEY CWE-639
The listed versions of Nexx Smart Home devices lack proper access control when executing actions. An attacker with a valid NexxHome deviceId could retrieve device history, set device settings, and retrieve device information.
CVE-2023-1750 has been assigned to this vulnerability. A CVSS v3 base score of 7.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N).
3.2.4 IMPROPER INPUT VALIDATION CWE-20
The listed versions of Nexx Smart Home devices use a WebSocket server that does not validate if the bearer token in the Authorization header belongs to the device attempting to associate. This could allow any authorized user to receive alarm information and signals meant for other devices which leak a deviceId.
CVE-2023-1751 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:H/I:N/A:N).
3.2.5 IMPROPER AUTHENTICATION CWE-287
The listed versions of Nexx Smart Home devices could allow any user to register an already registered alarm or associated device with only the deviceβs MAC address.
CVE-2023-1752 has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H).
Sam Sabetan reported these vulnerabilities to CISA.
Nexx has not responded to requests to work with CISA to mitigate these vulnerabilities. Users of the affected product are encouraged to contact Nexx support for additional information.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage at cisa.gov/ics. Several CISA products detailing cyber defense best 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 webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1748
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1749
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1750
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1751
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1752
cisa.gov/ics
cisa.gov/ics
cwe.mitre.org/data/definitions/20.html
cwe.mitre.org/data/definitions/287.html
cwe.mitre.org/data/definitions/639.html
cwe.mitre.org/data/definitions/639.html
cwe.mitre.org/data/definitions/798.html
getnexx.com/pages/contact-us
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
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us-cert.cisa.gov/ics/Recommended-Practices
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.dhs.gov
www.dhs.gov/foia
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
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mailto:?subject=Nexx%20Smart%20Home%20Device&body=www.cisa.gov/news-events/ics-advisories/icsa-23-094-01
10 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.1 High
AI Score
Confidence
Low
0.002 Low
EPSS
Percentile
54.2%