ESB-2018.2010 - [Win] SEL products: Multiple vulnerabilities 2018-07-11

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2010
Schweitzer Engineering Laboratories, Inc. Compass and AcSELerator Architect
                               11 July 2018

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

Product:           SEL Compass
                   SEL AcSELerator Architect
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Modify Arbitrary Files          -- Existing Account            
                   Denial of Service               -- Remote with User Interaction
                   Access Confidential Data        -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10608 CVE-2018-10604 CVE-2018-10600

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-191-02

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Advisory (ICSA-18-191-02)

Schweitzer Engineering Laboratories, Inc. Compass and AcSELerator Architect

Original release date: July 10, 2018

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided "as is" for informational purposes only. The Department of Homeland
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For more information about TLP, see http://www.us-cert.gov/tlp/.

1. EXECUTIVE SUMMARY

  * CVSS v3 8.2
  * ATTENTION: Exploitable remotely/Low skill level to exploit/Public exploits
    are available for these vulnerabilities
  * Vendor: Schweitzer Engineering Laboratories, Inc. (SEL)
  * Equipment: Compass and AcSELerator Architect
  * Vulnerabilities: Incorrect Default Permissions, XXE, Resource Exhaustion

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow modification/
replacement of files within the Compass installation directory, disclosure of
information, or denial of service.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following products from SEL are affected. Not all products are affected by
all vulnerabilities.

  * Compass Version 3.0.5.1 and prior
  * AcSELerator Architect Version 2.2.24.0 and prior (ICD package Version
    2.38.0)

3.2 VULNERABILITY OVERVIEW

3.2.1    INCORRECT DEFAULT PERMISSIONS CWE-276

Incorrect default permissions allows all users full access to the SEL Compass
directory, which may allow modification or overwriting of files within the
Compass installation folder, resulting in escalation of privilege and/or
malicious code execution. 

CVE-2018-10604 has been assigned to this vulnerability. A CVSS v3 base score of
8.2 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:C/C:H
/I:H/A:H).

3.2.2    IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE ('XXE') CWE-611

An XXE vulnerability allows unsanitized input to be passed to the AcSELerator
Architect XML parser, which may allow disclosure and retrieval of arbitrary
data, arbitrary code execution (in certain situations on specific platforms),
and denial of service attacks. 

CVE-2018-10600 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:R/S:C/C:H
/I:N/A:L).

3.2.3    UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400

A resource exhaustion vulnerability can be exploited when the AcSELerator
Architect FTP client connects to a malicious FTP server, which may cause denial
of service via 100% CPU utilization. Restart of the application is required. 

CVE-2018-10608 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:R/S:U/C:N
/I:N/A:H).

3.3 BACKGROUND

  * CRITICAL INFRASTRUCTURE SECTORS: Energy
  * COUNTRIES/AREAS DEPLOYED: Worldwide
  * COMPANY HEADQUARTERS LOCATION: USA

3.4 RESEARCHER

Gjoko Krstic of Applied Risk reported this vulnerability to NCCIC.

4. MITIGATIONS

SEL recommends affected users upgrade to latest release:

SEL Compass v3.0.6.1 or later

https://selinc.com/products/compass/#tab-downloads

SEL AcSELerator v2.2.29.0 (ICD 2.44.0) or later

https://selinc.com/products/5032/#tab-downloads

Contact SEL Support for specific instructions and downloads:

https://selinc.com/support/?categories.Customer%20Service

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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.

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.

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