ESB-2018.3268 - [Win] Advantech WebAccess: Multiple vulnerabilities 2018-10-25

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3268
   Multiple vulnerabilities have been identified in Advantech WebAccess
                              25 October 2018

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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
                   Administrator Compromise        -- Existing Account      
                   Delete Arbitrary Files          -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-14828 CVE-2018-14820 CVE-2018-14816
                   CVE-2018-14806  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-296-01

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Advisory (ICSA-18-296-01)

Advantech WebAccess

Original release date: October 23, 2018

Legal Notice

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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/.

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1. EXECUTIVE SUMMARY

  o CVSS v3 9.8
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Advantech
  o Equipment: WebAccess
  o Vulnerabilities: Stack-based Buffer Overflow, External Control of File Name
    or Path, Improper Privilege Management, Path Traversal

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to
execute arbitrary code, access files and perform actions at a privileged level,
or delete files on the system.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of WebAccess are affected:

  o WebAccess Versions 8.3.1 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1    STACK-BASED BUFFER OVERFLOW CWE-121

Several stack-based buffer overflow vulnerabilities have been identified, which
may allow an attacker to execute arbitrary code.

CVE-2018-14816 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    EXTERNAL CONTROL OF FILE NAME OR PATH CWE-73

A .dll component is susceptible to external control of file name or path
vulnerability, which may allow an arbitrary file deletion when processing.

CVE-2018-14820 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).

3.2.3    IMPROPER PRIVILEGE MANAGEMENT CWE-269

An improper privilege management vulnerability has been identified, which may
allow an attacker to access those files and perform actions at a system
administrator level.

CVE-2018-14828 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H).

3.2.4    IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
TRAVERSAL') CWE-22

A path traversal vulnerability may allow an attacker to execute arbitrary code.

CVE-2018-14806 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).

3.3 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

Mat Powell of Trend Micro Zero Day Initiative working with Trend Micro's Zero
Day Initiative reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Advantech has released Version 8.3.3 of WebAccess to address the reported
vulnerabilities. Users can download the latest version of WebAccess at the
following location:

http://support.advantech.com/support/DownloadSRDetail_New.aspx-SR_ID=1-MS9MJV&
Doc_Source=Download

NCCIC 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.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC 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
on the ICS-CERT website 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 NCCIC for tracking
and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.

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