7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 High
AI Score
Confidence
Low
0.019 Low
EPSS
Percentile
88.5%
Successful exploitation of these vulnerabilities could crash the device, cause a buffer overflow, allow remote execution of arbitrary code, or allow access to sensitive information.
Moxa reports these vulnerabilities affects the following protocol gateways:
Two separate issues cause a buffer overflow in the built-in web server that may allow a remote attacker to initiate a DoS attack and execute arbitrary code.
CVE-2019-9099 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
An integer overflow causes unexpected memory allocation that can lead to a buffer overflow.
CVE-2019-9098 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).
A predictable mechanism of generating tokens allows remote attackers to bypass the cross-site request forgery (CSRF) protection mechanism.
CVE-2019-9102 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A weak cryptographic algorithm with predictable variables may allow sensitive information to be revealed.
CVE-2019-9095 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).
An attacker can access sensitive information and usernames via the built-in web service without proper authorization
CVE-2019-9103 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Sensitive information is transmitted over some web applications in clear text.
CVE-2019-9101 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weak password requirements may allow an attacker to gain access by using brute force.
CVE-2019-9096 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Sensitive information is stored in configuration files without encryption, which may allow an attacker to access an administrative account.
CVE-2019-9104 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).
The web service may become temporarily unavailable if an attacker is able to overload the system to cause the service to crash.
CVE-2019-9097 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
Ilya Karpov and Evgeniy Druzhinin from Rostelecom-Solar, and Maxim Kozhevnikov from Positive Technologies reported these vulnerabilities to Moxa.
Moxa has developed the following solutions to address the vulnerabilities:
Please see Moxa’s security advisory for more information.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 on us-cert.gov. 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 webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9095
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9096
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9097
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9098
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9099
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9101
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9102
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9103
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9104
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/200.html
cwe.mitre.org/data/definitions/312.html
cwe.mitre.org/data/definitions/319.html
cwe.mitre.org/data/definitions/327.html
cwe.mitre.org/data/definitions/352.html
cwe.mitre.org/data/definitions/521.html
cwe.mitre.org/data/definitions/680.html
cwe.mitre.org/data/definitions/941.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Moxa%20MB3xxx%20Series%20Protocol%20Gateways+https://www.cisa.gov/news-events/ics-advisories/icsa-20-056-01
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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www.moxa.com/en/support/support/security-advisory/mb3710-3180-3270-3280-3480-3660-vulnerabilities
www.moxa.com/support/product-support/software-and-documentation/search?psid=56792
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www.moxa.com/support/product-support/software-and-documentation/search?psid=56829
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www.moxa.com/support/product-support/software-and-documentation/search?psid=56829
www.moxa.com/support/product-support/software-and-documentation/search?psid=56846
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-20-056-01
www.us-cert.gov/ics
www.us-cert.gov/ics
www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01
www.us-cert.gov/ics/recommended-practices
www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/ncas/tips/ST04-014
www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf
www.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Moxa%20MB3xxx%20Series%20Protocol%20Gateways&body=www.cisa.gov/news-events/ics-advisories/icsa-20-056-01
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 High
AI Score
Confidence
Low
0.019 Low
EPSS
Percentile
88.5%