CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
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
AI Score
Confidence
Low
EPSS
Percentile
89.3%
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--------- End Update A Part 1 of 4 ---------
This updated advisory is a follow-up to the original advisory titled ICSA-18-277-01 WECON PI Studio that was published October 4, 2018, to the ICS webpage on us-cert.cisa.gov.
--------- Begin Update A Part 2 of 4 ----------
Successful exploitation of these vulnerabilities may allow execution of code and disclose sensitive information under the context of administrator.
--------- End Update A Part 2 of 4 ---------
The following versions of PI Studio, an HMI project programmer, are affected:
--------- Begin Update A Part 3 of 4 ---------
--------- End Update A Part 3 of 4 ---------
--------- Begin Update A Part 4 of 4 ---------
When parsing specific files the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code under the context of an administrator.
CVE-2018-14818 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
When parsing specific files the process does not properly validate user-supplied data, which can result in multiple write instances past the end of an allocated object. An attacker can leverage this vulnerability to execute code under the context of an administrator.
CVE-2018-14810 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
When parsing project files the XMLParser that ships with Wecon PIStudio is vulnerable to a XML external entity injection attack, which may allow sensitive information disclosure.
CVE-2018-17889 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).
When parsing specific files the process does not properly validate user-supplied data, which can result in a read past the end of an allocated object.
CVE-2018-14814 has been assigned to this vulnerability. A CVSS v3 base score of 3.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
--------- End Update A Part 4 of 4 ---------
Mat Powell of Trend Microβs Zero Day Initiative and Natnael Samson (Natti), working with Trend Microβs Zero Day Initiative, reported these vulnerabilities to CISA.
WECON has verified these vulnerabilities but has not yet released an updated version. CISA is working with WECON and will update this advisory once an updated version is released.
CISA recommends users take defensive measures to minimize the risk of exploitation of 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 on us-cert.cisa.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.cisa.gov 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 CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. These vulnerabilities are not exploitable remotely.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-14810
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-14814
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-14818
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-17889
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-277-01
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/125.html
cwe.mitre.org/data/definitions/611.html
cwe.mitre.org/data/definitions/787.html
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us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
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
AI Score
Confidence
Low
EPSS
Percentile
89.3%