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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AI Score
Confidence
High
EPSS
Percentile
70.3%
CVSS v3 7.3
ATTENTION: Exploitable remotely/low skill level to exploit
**Vendor:**Advantech
Equipment: WebAccess/SCADA
Vulnerability: Improper Input Validation
Successful exploitation of this vulnerability could cause a stack buffer overflow condition.
The following versions of WebAccess/SCADA, a SCADA software platform, are affected:
3.2.1 IMPROPER INPUT VALIDATION CWE-20
Lack of proper validation of user supplied input may allow an attacker to cause the overflow of a buffer on the stack.
CVE-2018-18999 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
Jacob Baines of Tenable Network Security reported this vulnerability to NCCIC.
Advantech has released Version 8.3.4 of WebAccess/SCADA to address the reported vulnerability. Users can download the latest version of WebAccess/SCADA at the following location (registration required):
http://support.advantech.com/support/DownloadSRDetail_New.aspx?SR_ID=1-S9MJV&Doc_Source=Download
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
support.advantech.com/support/DownloadSRDetail_New.aspx?SR_ID=1-S9MJV&Doc_Source=Download
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-18999
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-352-02
cwe.mitre.org/data/definitions/20.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Advantech%20WebAccess/SCADA+https://www.cisa.gov/news-events/ics-advisories/icsa-18-352-02
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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:L/A:L
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mailto:?subject=Advantech%20WebAccess/SCADA&body=www.cisa.gov/news-events/ics-advisories/icsa-18-352-02
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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AI Score
Confidence
High
EPSS
Percentile
70.3%