Operating System:

[Win]

Published:

31 August 2015

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2272
               Moxa SoftCMS Buffer Overflow Vulnerabilities
                              31 August 2015

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

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

Product:           Moxa SoftCMS
Publisher:         US-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-6458 CVE-2015-6457 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-15-239-01

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Advisory (ICSA-15-239-01)

Moxa SoftCMS Buffer Overflow Vulnerabilities

Original release date: August 27, 2015

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 HPs Zero Day Initiative (ZDI) concerning
buffer overflow vulnerabilities in Moxas SoftCMS software package. These 
vulnerabilities were reported to ZDI by security researcher Carsten Eiram of 
Risk Based Security, who identified seven vulnerabilities, and Fritz Sands, 
who discovered two vulnerabilities. Moxa has released a new version to 
mitigate these vulnerabilities.

These vulnerabilities could be exploited remotely.

AFFECTED PRODUCTS

The following versions of Moxas SoftCMS are affected:

    SoftCMS, Version 1.3 and prior versions.

IMPACT

Successful exploitation of these vulnerabilities could cause a buffer overflow
condition that may allow remote code execution.

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

Moxa is a Taiwan-based company that maintains offices in several countries 
around the world, including the US, UK, India, Germany, France, China, Russia,
and Brazil.

The affected product, SoftCMS, is a central management software that manages 
large scale surveillance systems. According to Moxa, SoftCMS is deployed 
across several sectors including Commercial Facilities, Critical 
Manufacturing, Energy, Transportation Systems, and others. Moxa estimates that
these products are used primarily in the United States and Europe with a small
percentage in Asia.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

HEAP-BASED BUFFER OVERFLOW [a]

The application is susceptible to multiple buffer overflow conditions that may
crash or allow remote code execution.

CVE-2015-6457 [b] has been assigned to this vulnerability. ZDI has assigned a
CVSS v2 base score of 6.8; the CVSS vector string is 
(AV:N/AC:M/Au:N/C:P/I:P/A:P). [c] 

CLASSIC BUFFER OVERFLOW [d]

The application is susceptible to multiple buffer overflow conditions that may
crash or allow remote code execution.

CVE-2015-6458 [e] has been assigned to this vulnerability. ZDI has assigned a
CVSS v2 base score of 6.8; the CVSS vector string is 
(AV:N/AC:M/Au:N/C:P/I:P/A:P). [f] 

VULNERABILITY DETAILS EXPLOITABILITY

These vulnerabilities could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

An attacker with medium skill would be able to exploit these vulnerabilities.

MITIGATION

Moxa has released SoftCMS, Version 1.4 on June 1, 2015, which addresses the 
vulnerabilities by removing SStreamVideo ActiveX Control. SoftCMS, Version 1.4
can be downloaded at the following URL:

http://www.moxa.com/support/download.aspx?type=support&id=8013

ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:

Using application whitelisting will not prevent memory-based attacks, such as
exploiting buffer overflows vulnerabilities, but it can prevent shellcode from
running executables that have not been authorized, thereby limiting the impact
of memory-based attacks that call files. 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.

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 ICSCERT 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 August
27, 2015.

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6457, 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, 
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P, web
site last accessed August 27, 2015.

d. CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer 
Overflow'), http://cwe.mitre.org/data/definitions/120.html, web site last 
accessed August 27, 2015.

e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6458, 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, 
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P, web
site last accessed August 27, 2015.

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