ESB-2017.2813 - [Win] Advantech WebAccess: Execute arbitrary code/commands - Remote/unauthenticated 2017-11-03

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2813
 Advisory (ICSA-17-306-02) Advantech WebAccess Stack-based Buffer Overflow
                              3 November 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Advantech WebAccess
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14016 CVE-2017-12719 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-306-02

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Advisory (ICSA-17-306-02)

Advantech WebAccess

Original release date: November 02, 2017

Legal Notice

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"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/.

CVSS v3 7.3

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Advantech

Equipment: WebAccess

Vulnerabilities: Stack-based Buffer Overflow, Untrusted Pointer Dereference

AFFECTED PRODUCTS

The following versions of WebAccess, an HMI platform, are affected:

- -WebAccess versions prior to V8.2_20170817

IMPACT

Successful exploitation of these vulnerabilities may allow remote code 
execution.

MITIGATION

Advantech has released a new version of WebAccess 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 (link is external)

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the 
risk of exploitation of these vulnerabilities. Specifically, users should:

- -Minimize network exposure for all control system devices and/or systems, 
and ensure that they are not accessible from the Internet.

- -Locate control system networks and remote devices behind firewalls, and 
isolate them from the business network.

- -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.

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 ICSCERT Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted 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.

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW CWE-121

The application lacks proper validation of the length of user-supplied data 
prior to copying it to a stack-based buffer, which could allow an attacker to
execute arbitrary code under the context of the process.

CVE-2017-14016 has been assigned to this vulnerability. A CVSS v3 base score 
of 6.3 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

UNTRUSTED POINTER DEREFERENCE CWE-822

A remote attacker is able to execute code to dereference a pointer within the
program causing the application to become unavailable.

CVE-2017-12719 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

RESEARCHER

Steven Seeley, working with Zero Day Initiative, reported the vulnerabilities
to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and 
Wastewater Systems

Countries/Areas Deployed: East Asia, United States, Europe

Company Headquarters Location: Taiwan

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