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McAfee Security Bulletin - VirusScan Enterprise 8.8 for Windows update fixes McTray elevation with log files vulnerability (CVE-2018-6674)
Security Bulletins ID:   SB10237
Last Modified:  5/9/2018
Rated:


Summary

First Published: May 9, 2018
 
 Impact of Vulnerability: Permissions, Privileges, and Access Control (CWE-264)
Privilege Escalation (CWE-274)
Data Leakage via Privilege Escalation (CWE-269)
 CVE ID: CVE-2018-6674
 Severity Rating: Medium
 CVSS v3 Base/Temporal Scores: 6.8 / 6.2
 Recommendations: Install or update to VirusScan Enterprise (VSE) 8.8 Patch 11
 Security Bulletin Replacement: None
 Affected Software: VSE 8.8 for Windows Patch 10 and earlier
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
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Article contents: Vulnerability Description
When the process McTray.exe runs with elevated privileges, VSE might spawn a process inheriting the parent's privileges. This issue exposes the system to be manipulated by an attacker who has gained Admin privileges and then control of the physical machine.

CVE-2018-6674
Gain Privilege vulnerability in Microsoft Windows client in McAfee VirusScan Enterprise (VSE) 8.8 allows local users to view configuration information in plain text format via the GUI or GUI terminal commands.
NOTE: The following links were not yet populated with CVE details at the time of publication of this Security Bulletin.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6674
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6674

Although the vulnerability level score is medium, the fact that the attacker needs access to the physical machine with Admin privileges makes the risk of an exploitation generally low.

Remediation
This issue is resolved in VSE 8.8 for Windows Patch 11.

Go to the Product Downloads site and download the applicable product patch file:
 
Product Type File Name Release Date
VSE  Patch  8.8 Patch 11 April 24, 2018
 
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
To avoid this issue, McAfee strongly recommends that process privileges of endpoint components do not get elevated in the production environment, for any reason.

Workaround
None. McAfee strongly recommends you install the available patch update specified in the Remediation table.
 
Acknowledgements
McAfee credits the Lockheed Martin Red Team and the Lockheed Martin EDP Team 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 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, 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-2018-6674: McTray elevation vulnerability with log files
 
Base Score 6.8
Attack Vector (AV) Physical (P)
Attack Complexity (AC) High (H)
Privileges Required (PR) High (H)
User Interaction (UI) Required (R)
Scope (S) Changed (C)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
Temporal Score (Overall) 6.2
Exploitability (E) Proof-of-Concept (P)
Remediation Level (RL) Temporary Fix (T)
Report Confidence (RC) Confirmed (C)
 
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:T/RC:C

Where can I find a list of all Security Bulletins or how do I report a product vulnerability?
All Security Bulletins are published on our external PSIRT website. Security Bulletins are retired once a product is both End of Life and End of Support.
 
If you have information about a security issue or vulnerability with a McAfee product, visit the McAfee PSIRT website.
 
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 preceding limitation may not apply.
 
Any future product release dates mentioned in this 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 canceled at any time.

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