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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-19-141-01) Computrols CBAS Web
24 May 2019
AusCERT Security Bulletin Summary
Product: CBAS Web
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Cross-site Request Forgery -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2019-10855 CVE-2019-10854 CVE-2019-10853
CVE-2019-10852 CVE-2019-10851 CVE-2019-10849
CVE-2019-10848 CVE-2019-10847 CVE-2019-10846
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Computrols CBAS Web
Original release date: May 21, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Computrols
o Equipment: CBAS Web
o Vulnerabilities: Cross-site Request Forgery, Information Exposure Through
Discrepancy, Cross-site Scripting, Command Injection, Information Exposure
Through Source Code, Use of Hard-coded Cryptographic Key, SQL Injection,
Authentication Bypass Using an Alternate Path or Channel, Inadequate
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow unauthorized
actions with administrative privileges, disclosure of sensitive information,
execution of code within a user's browser, execution of unauthorized OS
commands, unauthorized access to the database, execution of unauthorized SQL
commands, authentication bypass, or decryption of passwords.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
All versions of CBAS Web, a Web Building Management System (BMS), prior to the
following versions are affected:
3.2 VULNERABILITY OVERVIEW
3.2.1 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
Users can perform certain actions via HTTP requests without performing any
validity checks, which may allow unauthorized actions with administrative
privileges if a logged-in user visits a malicious website.
CVE-2019-10847 has been assigned to this vulnerability. A CVSS v3 base score of
5.0 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
3.2.2 INFORMATION EXPOSURE THROUGH DISCREPANCY CWE-203
The application suffers from a username enumeration weakness. The device
behaves differently or sends different responses in a way that may expose
security-relevant information about the state of the product.
CVE-2019-10848 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:L/PR:N/UI:N/S:U/
3.2.3 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
Specific parameters passed to scripts is not sanitized before being returned to
the user, which may allow an attacker to execute arbitrary code in a user's
browser session in context of an affected site.
CVE-2019-10846 has been assigned to this vulnerability. A CVSS v3 base score of
5.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
3.2.4 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND
The application incorrectly neutralizes special elements that could modify the
intended OS command when it is sent to a downstream component, which could
allow attackers to execute commands directly on the operating system.
CVE-2019-10854 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
3.2.5 INFORMATION EXPOSURE THROUGH SOURCE CODE CWE-540
The application has an unprotected subversion directory, which may allow an
attacker to download the entire firmware codebase and discover sensitive
information about the inner workings of the underlying OS.
CVE-2019-10849 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/
3.2.6 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321
Several scripts contain a hard-coded encryption key for database backup file
decryption, which may allow an authenticated attacker to gain access to the
full database of the device and discover sensitive information.
CVE-2019-10851 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:L/UI:N/S:U/
3.2.7 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL
Improper validation of parameters passed to different scripts may allow a
remote authenticated attacker to execute arbitrary SQL commands in the
CVE-2019-10852 has been assigned to this vulnerability. A CVSS v3 base score of
6.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
3.2.8 AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
Sending specific parameters to a function will enable the auth flag, which may
allow an unauthenticated attacker to bypass authentication and gain full
control of the device.
CVE-2019-10853 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
3.2.9 INADEQUATE ENCRYPTION STRENGTH CWE-326
The application stores the passwords in the database using the MD5 hash. The
MD5 algorithm is vulnerable to known cryptographic attacks, which may allow
discovery of passwords.
CVE-2019-10855 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:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Government
Facilities, Healthcare and Public Health
o COUNTRIES/AREAS DEPLOYED: North America
o COMPANY HEADQUARTERS LOCATION: United States
Gjoko Krstic of Applied Risk reported these vulnerabilities to Computrols.
Computrols recommends users upgrade to the following versions or later for each
respective major versions of CBAS Web:
Updated software can be obtained by contacting Computrols Technical Support:
For more information, see the Computrols security advisory at the following
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
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.
NCCIC also recommends that 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.
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