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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2108
         Advisory (icsa-21-161-02) AGG Software Web Server Plugin
                               11 June 2021

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

Product:           AGG Software Web Server
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-32964 CVE-2021-32962 

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-161-02

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ICS Advisory (ICSA-21-161-02)

AGG Software Web Server Plugin

Original release date: June 10, 2021

Legal Notice

All information products included in https://us-cert.cisa.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://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 8.2
  o ATTENTION: Exploitable remotely/low attack complexity
  o Vendor: AGG Software
  o Equipment: Web Server
  o Vulnerabilities: Path Traversal, Cross-site Scripting

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow remote code
execution and exposure of arbitrary system files.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Web Server may be bundled with any Data Logger:

  o v4.0.40.1014 and prior (webserver.dll)

3.2 VULNERABILITY OVERVIEW

3.2.1 PATH TRAVERSAL CWE-23

The affected product is vulnerable to a path traversal attack, which may allow
an attacker to read arbitrary files from the file system.

CVE-2021-32964 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:N/UI:N/S:U/
C:L/I:L/A:N ).

3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79

The affected product is vulnerable to cross-site scripting, which may allow an
attacker to remotely execute arbitrary code.

CVE-2021-32962 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:L/I:H/A:N ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Multiple
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Canada

3.4 RESEARCHER

Michael Heinzl reported these vulnerabilities to CISA.

4. MITIGATIONS

AGG recommends Web Server plugin users to update to 4.0.42 Build 512 or later .
This plugin may be bundled with any of AGG data loggers.

CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 VPNs may have vulnerabilities and should be
    updated to the most current version available. Also recognize VPN is only
    as secure as its 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.cisa.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.cisa.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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