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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1780 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: https://kc.mcafee.com/corporate/index?page=content&id=SB10280 - --------------------------BEGIN INCLUDED TEXT-------------------- 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 Summary 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. CVE-2019-3586 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. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2019-3586 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2019-3586 Affected Component: o ENS Firewall Remediation 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 file: +-------+-------+------+----------------------+------------+ |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. Acknowledgments 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. https://nvd.nist.gov/cvss/v3-calculatorvector=CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C /C:L/I:L/A:H/E:P/RL:O/RC:C - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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