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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1174
                    Panasonic FPWIN Pro Vulnerabilities
                                12 May 2016

===========================================================================

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

Product:           Panasonic FPWIN Pro
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-4499 CVE-2016-4498 CVE-2016-4497
                   CVE-2016-4496  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-131-01

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Advisory (ICSA-16-131-01)

Panasonic FPWIN Pro Vulnerabilities

Original release date: May 10, 2016

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 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/.

OVERVIEW

NCCIC/ICS-CERT received a report from Trend Micro's Zero Day Initiative
(ZDI) concerning buffer overflow vulnerabilities in Panasonic FPWIN Pro
software. These vulnerabilities were reported to ZDI by security researcher
Steven Seeley. Panasonic has produced a new version to mitigate these
vulnerabilities.

AFFECTED PRODUCTS

Panasonic reports that these vulnerabilities affect the following products:

    FPWIN Pro version 5.x,
    FPWIN Pro version 6.x, and
    FPWIN Pro version 7.122 and prior.

Software releases 5.x have reached end-of-support, and users are advised
to migrate to a supported release. Software releases 6.x are end-of-sales
since April 2015 and will reach end-of-support in September 2016. Users
using 6.x releases are advised to plan for an upgrade to the supported
software release.

IMPACT

Reading malformed project file can crash Panasonic FPWIN Pro
application. Vulnerabilities do not have direct impact on the system
controlled by Panasonic FPWIN Pro application.

Impact to individual organizations depends on many factors that are unique
to each organization. ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.

BACKGROUND

Panasonic Electric Works Europe AG is a Panasonic company developing
automation products and industrial solutions.

The affected product, FPWIN Pro, is programming software for all FP Series
PLCs. According to Panasonic, FPWIN Pro is deployed across several sectors
including Commercial Facilities, Critical Manufacturing, and Food and
Agriculture. Panasonic estimates that these products are used primarily
in Europe, North America, and Asia.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

HEAP-BASED BUFFER OVERFLOW[a]

There are multiple ways an attacker can overwrite portions of the heap,
which may cause the program to crash.

CVE-2016-4499[b] has been assigned to this vulnerability. A CVSS
v3 base score of 4.2 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L).[c]

ACCESS OF UNINITIALIZED POINTER[d]

The program accesses a pointer that has not been initialized.

CVE-2016-4498[e] has been assigned to this vulnerability. A CVSS
v3 base score of 4.2 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L).[f]

OUT-OF-BOUNDS WRITE[g]

An attacker can use an index value or an integer overflow to force the
program to write outside the bounds of an array.

CVE-2016-4496[h] has been assigned to this vulnerability. A CVSS
v3 base score of 4.2 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L).[i]

TYPE CONFUSION[j]

The program allocates or initializes a resource; such as a pointer, object,
or variable; using one type, but it later accesses that resource using a
type that is incompatible with the original type.

CVE-2016-4497[k] has been assigned to this vulnerability. A CVSS
v3 base score of 4.2 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L).[l]

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities are not exploitable remotely and cannot be exploited
without user interaction. The exploit is only triggered when a local user
runs the vulnerable application and loads the malformed project file.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

Crafting a working exploit for these vulnerabilities would be
difficult. Social engineering is required to convince the user to accept
the malformed project file. Additional user interaction is needed to load
the malformed file. This decreases the likelihood of a successful exploit.

MITIGATION

Panasonic has released FPWIN Pro 7.130 software that addresses the
vulnerabilities described in this advisory. Fixed software can be
downloaded from

https://www.panasonic-electric-works.com/eu/plc-software-control-fpwin-pro.htm

Panasonic states that users may only install, use, and expect support for
software versions and feature sets for which they have purchased a license.

For more information about these issues or other vulnerabilities in
Panasonic products, please contact the Panasonic Product Security Incident
Response Team:

https://www.panasonic.com/global/corporate/product-security/sec/psirt.html

ICS-CERT recommends, as quality assurance, that users test the update in
a test development environment that reflects their production environment
prior to installation. In addition, users should:

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

ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

ICS-CERT also provides a section for control systems
security recommended practices on the ICS-CERT web page at:
http://ics-cert.us-cert.gov/content/recommended-practices. 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 ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site
(http://ics-cert.us-cert.gov/).

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.

    a.
    CWE-122: Heap-based Buffer Overflow,
    http://cwe.mitre.org/data/definitions/122.html, web site last accessed
    May 10, 2016.
    b.
    NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4499,
    NIST uses this advisory to create the CVE web site report. This web
    site will be active sometime after publication of this advisory.
    c.
    CVSS Calculator,
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S...,
    web site last accessed May 10, 2016.
    d.
    CWE-824: Access of Uninitialized Pointer,
    http://cwe.mitre.org/data/definitions/824.html, web site last accessed
    May 10, 2016.
    e.
    NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4498,
    NIST uses this advisory to create the CVE web site report. This web
    site will be active sometime after publication of this advisory.
    f.
    CVSS Calculator,
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S...,
    web site last accessed May 10, 2016.
    g.
    CWE-787: Out-of-bounds Write,
    http://cwe.mitre.org/data/definitions/787.html, web site last accessed
    May 10, 2016.
    h.
    NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4496,
    NIST uses this advisory to create the CVE web site report. This web
    site will be active sometime after publication of this advisory.
    i.
    CVSS Calculator,
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S...,
    web site last accessed May 10, 2016.
    j.
    CWE-843: Access of Resource Using Incompatible Type ('Type Confusion'),
    http://cwe.mitre.org/data/definitions/843.html, web site last accessed
    May 10, 2016.
    k.
    NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4497,
    NIST uses this advisory to create the CVE web site report. This web
    site will be active sometime after publication of this advisory.
    l.
    CVSS Calculator,
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S...,
    web site last accessed May 10, 2016.
    m.
    Recognizing and Avoiding Email Scams,
    http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
    accessed May 10, 2016.
    n.
    National Cyber Alert System Cyber Security Tip ST04-014,
    http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed
    May 10, 2016.

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov

ICS-CERT 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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