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AUSCERT External Security Bulletin Redistribution
ESB-2020.1251
Advisory (icsa-20-098-01) Advantech WebAccess/NMS
8 April 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Advantech WebAccess/NMS
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Delete Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-10631 CVE-2020-10629 CVE-2020-10625
CVE-2020-10623 CVE-2020-10621 CVE-2020-10619
CVE-2020-10617 CVE-2020-10603
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-098-01
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ICS Advisory (ICSA-20-098-01)
Advantech WebAccess/NMS
Original release date: April 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/NMS
o Vulnerabilities: Unrestricted Upload of File with Dangerous Type, SQL
Injection, Relative Path Traversal, Missing Authentication for Critical
Function, Improper Restriction of XML External Entity Reference, OS Command
Injection
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow an attacker to gain
remote code execution, upload files, delete files, cause a denial-of-service
condition, and create an admin account for the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of WebAccess/NMS, a network management system, are
affected:
o WebAccess/NMS versions prior to 3.0.2
3.2 VULNERABILITY OVERVIEW
3.2.1 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE CWE-434
Multiple issues exist that allow files to be uploaded and executed on the
system.
CVE-2020-10621 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 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL
INJECTION') CWE-89
There are multiple ways an unauthenticated attacker could perform SQL injection
to gain access to sensitive information.
CVE-2020-10617 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 ).
3.2.3 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL
INJECTION') CWE-89
Multiple vulnerabilities could allow an attacker with low privileges to perform
SQL injection to gain access to sensitive information.
CVE-2020-10623 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 ).
3.2.4 RELATIVE PATH TRAVERSAL CWE-23
An attacker could use a specially crafted URL to delete files outside the
application's control.
CVE-2020-10619 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 ).
3.2.5 RELATIVE PATH TRAVERSAL CWE-23
An attacker could use a specially crafted URL to delete or read files outside
the application's control.
CVE-2020-10631 has been assigned to this vulnerability. A CVSS v3 base score of
9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:H ).
3.2.6 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
The application allows an unauthenticated remote user to create a new admin
account.
CVE-2020-10625 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:H/A:N ).
3.2.7 IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE CWE-611
The application does not sanitize XML input. Specially crafted XML input could
allow an attacker to read sensitive files.
CVE-2020-10629 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 ).
3.2.8 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78
The application does not properly sanitize user input and may allow an attacker
to inject system commands remotely.
CVE-2020-10603 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:L/UI:N/S:U/
C:H/I:H/A:H ).
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
rgod of 9sg working with Trend Micro's Zero Day Initiative reported these
vulnerabilities to CISA.
4. MITIGATIONS
Advantech recommends updating to Version 3.0.2
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.
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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