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AUSCERT External Security Bulletin Redistribution
ESB-2019.4660
Advisory (icsa-19-346-01) Advantech DiagAnywhere Server
13 December 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Advantech DiagAnywhere Server
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18257
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-19-346-01
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ICS Advisory (ICSA-19-346-01)
Advantech DiagAnywhere Server
Original release date: December 12, 2019
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://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: DiagAnywhere Server
o Vulnerability: Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of DiagAnywhere Server, used for remotely monitoring and
controlling other Windows based devices, are affected:
o DiagAnywhere Server Versions 3.07.11 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Multiple stack-based buffer overflow vulnerabilities exist in the file transfer
service listening on the TCP port. Successful exploitation could allow an
unauthenticated attacker to execute arbitrary code with the privileges of the
user running DiagAnywhere Server.
CVE-2019-18257 has been assigned to these vulnerabilities. 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 ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: East Asia, United States, and Europe
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Z0mb1E working with Trend Micro's Zero Day Initiative, reported this
vulnerability to CISA.
4. MITIGATIONS
Advantech has phased out DiagAnywhere Server Version 3.07.11 and removed it
from its website.
Advantech has released Version 3.07.14 of DiagAnywhere Server to address the
reported vulnerability. Users can download the latest version of DiagAnywhere
Server by accessing the Advantech Support Portal at DiagAnywhere Server update
.
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 this vulnerability.
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