CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
92.6%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Advantech
Equipment: WebAccess
Vulnerabilities: Untrusted Pointer Dereference, Stack-based Buffer Overflow, Path Traversal, SQL Injection, Improper Input Validation.
This updated advisory is a follow-up to the original advisory titled ICSA-18-004-02 Advantech WebAccess that was published January 4, 2018, on the NCCIC/ICS-CERT web site.
Advantech reports the vulnerabilities affect the following WebAccess products:
Successful exploitation of these vulnerabilities could cause the device to crash. An attacker may be able to further exploit this condition to remotely execute arbitrary code or bypass authentication.
Advantech has released WebAccess Version 8.3 to address the reported vulnerabilities. Users can download the latest version of WebAccess at the following location (registration required):
<http://www.advantech.com/industrial-automation/webaccess/download>
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT 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 in the ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
There are multiple vulnerabilities that may allow an attacker to cause the program to use an invalid memory address, resulting in a program crash.
CVE-2017-16728 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).
There are multiple instances of a vulnerability that allows too much data to be written to a location on the stack.
CVE-2017-16724 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:N/S:U/C:N/I:L/A:H).
An attacker has access to files within the directory structure of the target device.
CVE-2017-16720 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).
WebAccess does not properly sanitize its inputs for SQL commands.
CVE-2017-16716 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).
WebAccess allows some inputs that may cause the program to crash.
CVE-2017-16753 has been assigned to this vulnerability. A CVSS v3 base score of 5.0 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H).
--------- Begin Update A Part 1 of 1 --------
WebAccess allows a remote attacker to upload arbitrary files.
CVE-2017-16736 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:L/A:N).
WebAccess allows an unauthenticated attacker to specify an arbitrary address.
CVE-2017-16732 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).
--------- End Update A Part 1 of 1 ----------
Steven Seeley of Offensive Security, Zhou Yu, rgod working with Trend Microβs Zero Day Initiative, and Michael DePlante of Leahy Center for Digital Investigation at Champlain College reported these vulnerabilities to ICS-CERT.
Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and Wastewater Systems
Countries/Areas Deployed: East Asia, United States, Europe
Company Headquarters Location: Taiwan
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16716
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16720
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16724
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16728
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16732
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16736
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16753
www.advantech.com/industrial-automation/webaccess/download
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
92.6%