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AUSCERT External Security Bulletin Redistribution
ESB-2020.1646
Advisory (icsa-20-128-01) Advantech WebAccess Node
11 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: WebAccess Node
Publisher: ICSA
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Overwrite Arbitrary Files -- Remote with User Interaction
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12026 CVE-2020-12022 CVE-2020-12018
CVE-2020-12014 CVE-2020-12010 CVE-2020-12006
CVE-2020-12002 CVE-2020-10638
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-128-01
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ICS Advisory (ICSA-20-128-01)
Advantech WebAccess Node
Original release date: May 07, 2020
Legal Notice
All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any information contained
within. DHS does not endorse any commercial product or service, referenced in
this product or otherwise. Further dissemination of this product is governed by
the Traffic Light Protocol (TLP) marking in the header. For more information
about TLP, see https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Advantech
o Equipment: WebAccess Node
o Vulnerabilities: Improper Validation of Array Index, Relative Path
Traversal, SQL Injection, Stack-based Buffer Overflow, Heap-based Buffer
Overflow, Out-of-bounds Read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow information
disclosure, remote code execution, and compromise system availability.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of WebAccess Node, an HMI platform, are affected:
o WebAccess Node Version 8.4.4 and prior
o WebAccess Node Version 9.0.0
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER VALIDATION OF ARRAY INDEX CWE-129
An improper validation vulnerability exists that could allow an attacker to
inject specially crafted input into memory where it can be executed.
CVE-2020-12022 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 ).
3.2.2 RELATIVE PATH TRAVERSAL CWE-23
Multiple relative path traversal vulnerabilities exist that may allow an
authenticated user to use a specially crafted file to delete files outside the
application's control.
CVE-2020-12010 has been assigned to this vulnerability. A CVSS v3 base score of
6.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:U/
C:N/I:L/A:H ).
3.2.3 RELATIVE PATH TRAVERSAL CWE-23
Multiple relative path traversal vulnerabilities exist that may allow an
attacker to overwrite files outside the application's control.
CVE-2020-12006 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 ).
3.2.4 RELATIVE PATH TRAVERSAL CWE-23
Multiple relative path traversal vulnerabilities exist that may allow a low
privilege user to overwrite files outside the application's control.
CVE-2020-12026 has been assigned to this vulnerability. A CVSS v3 base score of
8.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:U/
C:H/I:H/A:H ).
3.2.5 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL
INJECTION') CWE-89
Input is not properly sanitized and may allow an attacker to inject SQL
commands.
CVE-2020-12014 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 ).
3.2.6 STACK-BASED BUFFER OVERFLOW CWE-121
Multiple stack-based buffer overflow vulnerabilities exist caused by a lack of
proper validation of the length of user-supplied data, which may allow remote
code execution.
CVE-2020-12002 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 ).
3.2.7 HEAP-BASED BUFFER OVERFLOW CWE-122
Multiple heap-based buffer overflow vulnerabilities exist caused by a lack of
proper validation of the length of user-supplied data, which may allow remote
code execution.
CVE-2020-10638 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 ).
3.2.8 OUT-OF-BOUNDS READ CWE-125
An out-of-bounds vulnerability exists that may allow access to unauthorized
data.
CVE-2020-12018 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:H/I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: East Asia, United States, Europe
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Natnael Samson and Z0mb1E, working with Trend Micro's Zero Day Initiative,
reported these vulnerabilities to CISA.
4. MITIGATIONS
Advantech has released WebAccessNode Version 8.4.4.P0320844 to address the
reported vulnerabilities for users currently using WebAccessNode Version 8.4.4
Advantech has released WebAccessNode Version 9.0.0.P0320900 to address the
reported vulnerabilities for users currently using WebAccessNode Version 9.0.0
Note: Upon installation, there is a step to let the user decide whether to
define a password code for RPC calls. If the user leaves this blank, the
installation will pop up a warning to the user for potential risks that they
are willing to take.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
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:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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