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             AUSCERT External Security Bulletin Redistribution

     McAfee Endpoint Security fixes incomplete firewall vulnerability
                                17 May 2019


        AusCERT Security Bulletin Summary

Product:           McAfee Endpoint Security
Publisher:         McAfee
Operating System:  Windows
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3586  

Original Bulletin: 

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McAfee Security Bulletin - Endpoint Security fixes firewall not blocking all
Global Threat Intelligence flagged IP addresses vulnerability (CVE-2019-3586)

Security Bulletins ID   : SB10280

Last Modified           : 5/14/2019


First Published: May 14, 2019
|Impact of Vulnerability:     |Protection Mechanism Failure (CWE-693)         |
|CVE ID:                      |CVE-2019-3586                                  |
|Severity Rating:             |High                                           |
|CVSS v3 Base/Temporal Scores:|7.5 / 6.7                                      |
|Recommendations:             |Install Endpoint Security (ENS) 10.6.1 May     |
|                             |Update                                         |
|Security Bulletin            |None                                           |
|Replacement:                 |                                               |
|Affected Software:           |ENS 10.5.x and 10.6.x                          |
|Location of updated software:|http://www.mcafee.com/us/downloads/            |
|                             |downloads.aspx                                 |

Article contents:

  o Vulnerability Description
  o Remediation
  o Acknowledgments
  o Frequently Asked Questions (FAQs)
  o Resources
  o Disclaimer

Vulnerability Description
ENS offers the ability to configure the integrated Firewall to block inbound
and outbound access to IP addresses based on the classification returned
through a Global Threat Intelligence (GTI) lookup. Some configurations were
resulting in the ENS Firewall not correctly blocking connections based on the
GTI classification.

To actively exploit this an attacker would have to know which categories of GTI
reputations are configured and are not triggering the Firewall block, and then
manipulate their GTI reputation to fit one of these categories. The algorithms
used to generate the GTI reputation are proprietary.

ENS offers multiple protection and detection mechanisms; one of these may
detect any malicious activity that results from not blocking the connection.

Protection Mechanism Failure in the Firewall in McAfee Endpoint Security (ENS)
10.x prior to 10.6.1 May 2019 Update allows context-dependent attackers to
circumvent ENS protection where GTI flagged IP addresses are not blocked by the
ENS Firewall via specially crafted malicious sites where the GTI reputation is
carefully manipulated and does not correctly trigger the ENS Firewall to block
the connection.

Affected Component:

  o ENS Firewall

To remediate this issue, install the latest update. Users of ENS 10.5.x and
10.6.x should update to the ENS 10.6.1 May Update.

Go to the Product Downloads site, and download the applicable product update
|Product|Version|Type  |File Name             |Release Date|
|ENS    |10.6.1 |Update|10.6.1 May 2019 Update|May 14, 2018|

Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation,
updates, 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.
McAfee credits Chris Wynn from London Security for reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not
For Endpoint products:
Use the following instructions for endpoint or client-based products:

 1. Right-click on the McAfee tray shield icon on the Windows taskbar.
 2. Select Open Console.
 3. In the console, select Action Menu .
 4. In the Action Menu, select Product Details . The product version displays.

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, visit the CVSS
website at: http://www.first.org/cvss/ .

When calculating CVSS 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 the
successful exploitation of the issue being scored.

What are the CVSS scoring metrics

CVE-2019-3586: ENS Firewall not blocking all GTI flagged IP addresses
|Base Score              |7.5                 |
|Attack Vector (AV)      |Network (N)         |
|Attack Complexity (AC)  |High (H)            |
|Privileges Required (PR)|None (N)            |
|User Interaction (UI)   |Required (R)        |
|Scope (S)               |Changed (C)         |
|Confidentiality (C)     |Low (L)             |
|Integrity (I)           |Low (L)             |
|Availability (A)        |High (H)            |
|Temporal Score (Overall)|6.7                 |
|Exploitability (E)      |Proof-of-Concept (P)|
|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.

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