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McAfee Security Bulletin - VirusScan Enterprise 8.8 for Windows update fixes McTray privilege elevation vulnerability (CVE-2018-6674)
Security Bulletins ID:   SB10237
Last Modified:  6/11/2019
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 13
 Security Bulletin Replacement: None
 Affected Software: VSE 8.8 earlier than Patch 13
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
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Article contents: Vulnerability Description
By default, McTray.exe is configured to run with the logged in user's privileges. If you do not start McTray.exe with elevated privileges, you will not be impacted by this issue.

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. 

CVE-2018-6674
Privilege Escalation vulnerability in Microsoft Windows client (McTray.exe) in McAfee VirusScan Enterprise (VSE) 8.8 earlier than Patch 13 may allow local users to spawn unrelated processes with elevated privileges via the system administrator granting McTray.exe elevated privileges (by default it runs with the current user's privileges).
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, this issue is only exploitable if McTray.exe is configured to run with elevated privileges, making the risk of exploitation generally low.
Remediation
  • Upgrade to VSE 8.8 Patch 13.
  • If you are unable to upgrade to VSE 8.8 Patch 13, VSE 8.8 Patch 11 contains the initial fix, with further improvements in VSE 8.8 Patch 12.
Go to the Product Downloads site and download the applicable product patch file:
 
Product Type Version Release Date
VSE  Patch  8.8 Patch 13 June 11, 2019
 
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.
Mitigation
This issue is only encountered if you elevate the privileges of McTray to have Administrative privileges.
Acknowledgments
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 of privileges vulnerability
 
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?
All Security Bulletins are published on our external PSIRT website at http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx > Security Bulletins. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
 
How do I report a product vulnerability to McAfee?
If you have information about a security issue or vulnerability with a McAfee product, visit the McAfee PSIRT website for instructions at http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx > Report a Security Vulnerability.
 
How does McAfee respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any McAfee software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
 
McAfee only publishes Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
 
View our PSIRT policy on the McAfee PSIRT website at http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx > About PSIRT.
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 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 canceled at any time.

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