ESB-2018.0749 - [Win] CX-Supervisor: Multiple vulnerabilities 2018-03-14

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0749
                  Security fixes for Omron CX-Supervisor
                               14 March 2018

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

Product:           CX-Supervisor
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7525 CVE-2018-7523 CVE-2018-7521
                   CVE-2018-7519 CVE-2018-7517 CVE-2018-7515
                   CVE-2018-7513  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-072-01

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Advisory (ICSA-18-072-01)

Omron CX-Supervisor

Original release date: March 13, 2018

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
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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 http://www.us-cert.gov/tlp/.

CVSS v3 5.3

ATTENTION: Low skill level to exploit.

Vendor: Omron

Equipment: CX-Supervisor

Vulnerabilities: Stack-based Buffer Overflow, Use After Free, Access of
Uninitialized Pointer, Double Free, Out-of-bounds Write, Untrusted Pointer
Dereference, Heap-based Buffer Overflow

AFFECTED PRODUCTS

The following versions of CX-Supervisor are affected:

  * CX-Supervisor Versions 3.30 and prior.

IMPACT

Successful exploitation of these vulnerabilities could allow remote code
execution.

MITIGATION

Omron has released a version 3.4.1 of CX-Supervisor to address the reported
vulnerabilities. Users can download the latest version of CX-Supervisor at the
following location:

https://www.myomron.com/index.php?action=kb&article=1707

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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
in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber
Intrusion Detection and Mitigation Strategies, that is available for download
from the ICS-CERT website.

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.

In addition, NCCIC recommends that users take the following measures to protect
themselves from social engineering attacks:

  * Do not click web links or open unsolicited attachments in email messages.
  * Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  * Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target these vulnerabilities. These
vulnerabilities are not exploitable remotely.

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW CWE-121

Parsing malformed project files may cause a stack-based buffer overflow.

CVE-2018-7513 has 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).

USE AFTER FREE CWE-416

Use after free vulnerabilities can be exploited when CX Supervisor parses a
specially crafted project file.

CVE-2018-7521 has 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).

ACCESS OF UNINITIALIZED POINTER CWE-824

Access of uninitialized pointer vulnerabilities can be exploited when CX
Supervisor indirectly calls an initialized pointer when parsing malformed
packets.

CVE-2018-7515 has 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).

DOUBLE FREE CWE-415

Parsing malformed project files may cause a double free vulnerability.

CVE-2018-7523 has 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).

OUT-OF-BOUNDS WRITE CWE-787

Parsing malformed project files may cause an out of bounds vulnerability.

CVE-2018-7517 has 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).

UNTRUSTED POINTER DEREFERENCE CWE-822

Processing a malformed packet by a certain executable may cause an untrusted
pointer dereference vulnerability.

CVE-2018-7525 has 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).

HEAP-BASED BUFFER OVERFLOW CWE-122

Parsing malformed project files may cause a heap-based buffer overflow.

CVE-2018-7519 has 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).

RESEARCHER

rgod working with Trend Micro?s Zero Day Initiative reported these
vulnerabilities to NCCIC.

BACKGROUND

Critical Infrastructure Sector: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Japan

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