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AUSCERT External Security Bulletin Redistribution
ESB-2021.3693
Advisory (icsa-21-308-01) VISAM VBASE Editor
5 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: VISAM VBASE Editor
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote with User Interaction
Cross-site Scripting -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-95907 CVE-2021-42537 CVE-2021-42535
CVE-2021-34803 CVE-2020-13699 CVE-2019-18988
CVE-2018-16550 CVE-2018-14333 CVE-2005-2475
Reference: ESB-2019.4096
ESB-2007.0284
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-308-01
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ICS Advisory (ICSA-21-308-01)
VISAM VBASE Editor
Original release date: November 04, 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 7.4
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: VISAM
o Equipment: VBASE
o Vulnerabilities: Improper Access Control, Cross-site Scripting, Improper
Restriction of XML External Entity Reference, Using Components with Known
Vulnerabilities
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow un-neutralized
user-controllable data input, disclosure of local files, access to NTLM
(Windows New Technology LAN Manager) hashes, and access to sensitive files.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following version of VISAM VBASE Editor, an automation platform, are
affected:
o VBASE Pro-RT/ Server-RT (Web Remote): Version 11.6.0.6
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER ACCESS CONTROL CWE-284
The affected product is vulnerable to improper access control via the
web-remote endpoint, which may allow an unauthenticated user viewing access to
folders and files in the directory listing.
CVE-2021-95907 has been assigned to this vulnerability. A CVSS v3 base score of
7.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/
C:H/I:N/A:N ).
3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The affected product does not neutralize or incorrectly neutralizes
user-controllable input before the data is placed in output used as a
public-facing webpage.
CVE-2021-42535 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
C:H/I:N/A:N ).
3.2.3 IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE CWE-611
The affected software processes an XML document that can contain XML entities
with URIs that resolve to documents outside of the intended sphere of control,
causing the product to embed incorrect documents into its output.
CVE-2021-42537 has been assigned to this vulnerability. A CVSS v3 base score of
5.9 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
C:H/I:L/A:N ).
3.2.4 USING COMPONENTS WITH KNOWN VULNERABILITIES CWE-1035
The affected product relies on third-party components that are not actively
supported or maintained by the original developer or a trusted proxy. The
following CVEs are associated with this product.
CVE-2021-34803 , CVE-2020-13699 , CVE-2019-18988 , CVE-2018-16550 ,
CVE-2018-14333 , CVE-2005-2475 have been assigned to this vulnerability. A CVSS
v3 base score of 5.3 has been calculated; the CVSS vector string is ( AV:L/AC:L
/PR:N/UI:R/S:U/C:L/I:L/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Michael Heinzl reported these vulnerabilities to CISA.
4. MITIGATIONS
VISAM recommends users update to VBASE v11.7.0.2 or later. Users may obtain a
download link by submitting a request form .
For more information, please contact VISAM using the information provided on
the company contact page .
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.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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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