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McAfee Security Bulletin - McAfee Agent for Linux update fixes a Privilege Escalation vulnerability (CVE-2018-6704)
Security Bulletins ID:   SB10259
Last Modified:  2/6/2019

Summary

First Published: December 11, 2018
 
 Impact of Vulnerability: Insecure Temporary File (CWE-377)
 CVE ID: CVE-2018-6704
 Severity Rating: Medium
 CVSS v3 Base/Temporal Scores: 4.7 / 4.4
 Recommendations: Install or update to McAfee Agent 5.6.0
 Security Bulletin Replacement: None
 Affected Software: McAfee Agent 5.5.1, 5.5.0, 5.0.x
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
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Article contents: Vulnerability Description
This McAfee Agent release addresses a vulnerability in the Linux version, which addresses a privilege escalation due to insecure handling of temporary files.

This update resolves the following issue:

CVE-2018-6704: Privilege escalation due to use of insecure temporary files
Privilege escalation vulnerability in McAfee Agent (MA) for Linux 5.0.0 through 5.0.6, 5.5.0, and 5.5.1 allows local users to perform arbitrary command execution via specific conditions.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6704  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6704
Remediation
To remediate this issue:
  • Users of any McAfee Agent 5.5.1 and McAfee Agent 5.5.0 product versions must upgrade to McAfee Agent 5.6.0.
  • Users of any McAfee Agent 5.0.x product versions must upgrade to McAfee Agent 5.6.0.
Go to the Product Downloads site, and download the applicable product update file:
 
Product Version Type File Name Release Date
McAfee Agent  5.6.0 Minor Version Release MA560LNX.zip December 11, 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.
Workaround
None. McAfee highly recommends that all customers upgrade to McAfee Agent 5.6.0.
Acknowledgments
McAfee credits Andreas Dewald, ERNW Research GmbH (Germany) for discovery of this vulnerability.
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-2018-6704: Privilege escalation due to use of insecure temporary files
 
Base Score 4.7
Attack Vector (AV) Local (L)
Attack Complexity (AC) High (H)
Privileges Required (PR) High (H)
User Interaction (UI) Required (R)
Scope (S) Changed (C)
Confidentiality (C) Low (L)
Integrity (I) Low (L)
Availability (A) Low (L)
Temporal Score (Overall) 4.4
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/vuln-metrics/cvss/v3-calculator?vector=AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H/E:F/RL:O/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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