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McAfee Security Bulletin: Network Security Virtual Platform update resolves OpenSSH vulnerability that bypasses authentication restrictions defined by MaxAuthTries
Security Bulletins ID:   SB10157
Last Modified:  4/7/2017


First Published: 4/21/2016
 Impact of Vulnerability:  Permissions, Privileges, and Access Controls (CWE-264)
 CVE Numbers:  CVE-2015-5600
 Severity Rating:  High
 Base / Overall CVSS v3 Base / Temporal Scores:  8.1 / 7.5
 Recommendations: Install or update to Network Security Platform (NSP) for Network Security Virtual Platform (VMIPS).
See the Remediation table for other 8.x versions.
 Security Bulletin Replacement:  None
 Affected Software: Versions of VMIPS software released prior to the versions listed in the Remediation table
 Location of Updated Software:  Contact Technical Support for the download

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Article contents:


This vulnerability allows remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) using a long and duplicative list in the –oKbInteractiveDevices command option.
"OpenSSH has a default value of six authentication tries before it will close the connection (the SSH client allows only three password entries per default).

With this vulnerability an attacker is able to request as many password prompts limited by the "login graced time" setting that is set to two minutes by default."
OpenSSH keyboard-interactive authentication brute force vulnerability

Weaknesses in the management of control and access privileges, which are used to perform access to the vulnerable system.

This vulnerability exists in all versions of VMIPS software released prior to the versions listed in the Remediation table below.
Affected Components:
  • Network Security Virtual Platform (VMIPS)


Go to the Product Downloads site and download the applicable product patch/hotfix files:
Network Security Platform Sensor Software Product Type Version with fix (or use later) Release Date
VM Series – 8.3 Maintenance March 30, 2016
VM Series – 8.2 Maintenance March 23, 2016
VM Series – 8.1 Maintenance TBD May 5, 2016

Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, security updates, patches, and hotfixes. Review the Release Notes and the Installation Guide, which you can download from the Documentation tab, for instructions on how to install these updates.

Product Specific Notes

Product Exposures:
None. Install the platform specific Maintenance Release software updates.


None. Install the platform specific Maintenance Release software updates.


No vulnerability detection signatures are available.



Frequently Asked Questions (FAQs)

How do I know whether my McAfee product is vulnerable or not?

For Appliances:
Use the following instructions for Appliance based products:
  1. Open the Administrator's User Interface (UI).
  2. Click the About link. The product version is displayed.
What is CVSS?
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council’s effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, please visit the CVSS website at: http://www.first.org/cvss/.

When calculating CVSS v2 scores, McAfee has adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by successful exploitation of the issue being scored.

CVSS v3 scoring is in final review as of December 2015. CVSS v2 will be replaced with CVSS v3 when v3 is fully approved. Security bulletins will have scores for both versions for at least 6 months after v3 is fully approved.
What are the CVSS scoring metrics that have been used?
CVSS v3.0 Scoring:
 Base Score 8.1
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) None (N)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
 Temporal Score (Overall) 7.5
 Exploitability (E) Functional (F)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.

Where can I find a list of all security bulletins or how do I report a product vulnerability?
To find a list of all security bulletins, or if you have information about a security issue or vulnerability with a McAfee product, please visit our product security website at: http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx.


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  • If you are not a registered user, click Register and complete the required fields. Your password and logon instructions will be emailed to you.


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