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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

Summary

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) 8.3.7.43 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:

Description

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."
 
CVE-2015-5600
OpenSSH keyboard-interactive authentication brute force vulnerability
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5600  

CWE-264
Weaknesses in the management of control and access privileges, which are used to perform access to the vulnerable system.
http://cwe.mitre.org/data/definitions/264.html

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)

Remediation

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 8.3.7.3 March 30, 2016
VM Series – 8.2 Maintenance 8.2.7.98 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.

Workaround

None. Install the platform specific Maintenance Release software updates.

Mitigations

No vulnerability detection signatures are available.

Acknowledgements

None.

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.
https://www.first.org/cvss/v3/development
https://www.first.org/cvss/calculator/3.0
 
What are the CVSS scoring metrics that have been used?
 
CVE-2015-5600
 
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.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

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.

Resources

To contact Technical Support, log on to the ServicePortal and go to the Create a Service Request page at https://support.mcafee.com/ServicePortal/faces/serviceRequests/createSR:
  • If you are a registered user, type your User Id and Password, and then click Log In.
  • If you are not a registered user, click Register and complete the required fields. Your password and logon instructions will be emailed to you.

Disclaimer

The information provided in this security bulletin is provided as is without warranty of any kind. McAfee disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall McAfee or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if McAfee or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
 
Any future product release dates mentioned in this security bulletin are intended to outline our general product direction and they should not be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates are not a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remains at our sole discretion and may be changed or cancelled at any time.

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