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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1595
                 Meinberg NTP Time Server Vulnerabilities
                               24 June 2016

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

Product:           Meinberg NTP Time Server products
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Root Compromise   -- Existing Account
                   Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-3989 CVE-2016-3988 CVE-2016-3968
                   CVE-2016-3962  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-175-03

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Advisory (ICSA-16-175-03)

Meinberg NTP Time Server Vulnerabilities

Original release date: June 23, 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

Independent researcher Ryan Wincey has identified a stack buffer overflow 
vulnerability and a privilege escalation vulnerability in Meinbergs NTP Time 
Servers Interface. Meinberg has produced a new Version 6.20.004 to mitigate 
these vulnerabilities. The researcher has validated the firmware update. He 
confirms the update fixes these vulnerabilities.

These vulnerabilities could be exploited remotely.

AFFECTED PRODUCTS

The following Meinberg products are affected:

    IMS-LANTIME M3000 Version 6.0 and earlier,

    IMS-LANTIME M1000 Version 6.0 and earlier,

    IMS-LANTIME M500 Version 6.0 and earlier,

    LANTIME M900 Version 6.0 and earlier,

    LANTIME M600 Version 6.0 and earlier,

    LANTIME M400 Version 6.0 and earlier,

    LANTIME M300 Version 6.0 and earlier, LANTIME M200 Version 6.0 and 
    earlier,

    LANTIME M100 Version 6.0 and earlier,

    SyncFire 1100 Version 6.0 and earlier, and

    LCES Version 6.0 and earlier.

IMPACT

Successful exploitation of these vulnerabilities could cause a buffer overflow
condition that may allow escalation to root privileges.

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

BACKGROUND

Meinberg is a Germany-based company that maintains offices around the world, 
including North America, South America, Europe, Asia, Africa, and Australia.

The affected products are NTP Time Servers. According to Meinberg, 
IMS-LANTIME, LANTIME, SyncFire, and LCES Series are deployed across several 
sectors including Communications, Defense Industrial Base, Energy, Financial 
Services, Transportation Systems, and others. Meinberg estimates that these 
products are used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW [a] 

Remote stack buffer overflow vulnerability involving parsing of parameter in 
POST request in function provides privilege of web server nobody.

CVE-2016-3962 [b] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). [c]

STACK-BASED BUFFER OVERFLOW [d]

Remote stack buffer overflow vulnerability is present while parsing nine 
different parameters in POST request in function.

CVE-2016-3988 [e] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L). [f]

PRIVILEGE ESCALATION [g]

Weak access controls allow for privilege escalation from nobody to root user.
nobody has permissions to alter script that can only run as root.

CVE-2016-3989 [h] has been assigned to this vulnerability. A CVSS v3 base score 
of 8.1 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). [i]

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

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

MITIGATION

Meinberg has produced a new firmware Version 6.20.004. The new firmware can be
downloaded by using the link below:

https://urldefense.proofpoint.com/v2/url?u=http-3A__www.meinberg.de_download_firmware_lantime_v6_firmware-2D6.20.004-2Dx86.rel&d=BQIFaQ&c=54IZrppPQZKX9mLzcGdPfFD1hxrcB__aEkJFOKJFd00&r=zE5lG3CZZIbdBvT6slVAzQ&m=n4ZBSsrF-RphS7eiqohm3WcJ2BYQUCwQUHwVPHNFa6o&s=WlQnlBzw05tnJ1o29nmeXtGBbNubzjyRPqaWAdpXn5Y&e=
(link is external)

ICS-CERT recommends that 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.

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-121: Stack-based Buffer Overflow, 
http://cwe.mitre.org/data/definitions/121.html, web site last accessed June 
23, 2016.

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3962, 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:N/AC:L/PR:N/UI:N/S..., 
web site last accessed June 23, 2016.

d. CWE-121: Stack-based Buffer Overflow, 
http://cwe.mitre.org/data/definitions/121.html, web site last accessed June 
23, 2016.

e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3968, 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:N/AC:L/PR:N/UI:N/S..., 
web site last accessed June 23, 2016.

g. CWE-121: Stack-based Buffer Overflow, 
http://cwe.mitre.org/data/definitions/121.html, web site last accessed June 
23, 2016.

h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3989, 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:N/AC:L/PR:L/UI:N/S..., 
web site last accessed June 23, 2016.

Contact Information

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

Email: ics-cert@hq.dhs.gov (link sends e-mail)

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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