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McAfee Security Bulletin - Web Gateway update fixes two vulnerabilities (CVE-2018-6677 and CVE-2018-6678)
Security Bulletins ID:   SB10245
Last Modified:  9/20/2018


First Published: July 16, 2018
 Impact of Vulnerability: CVE-2018-6677: Privilege Escalation
CVE-2018-6678: Code execution
 CVE ID: CVE-2018-6677
 Severity Rating: CVE-2018-6677: High
CVE-2018-6678: Low
 CVSS v3 Base/Temporal Scores: CVE-2018-6677: 7.6 / 7.3
CVE-2018-6678: 3.4 / 3.2
 Recommendations: Install or update to McAfee Web Gateway (MWG) 7.8.2 (controlled release)
 Security Bulletin Replacement: None
 Affected Software: CVE-2018-6677: MWG 7.8.1.x
CVE-2018-6678: MWG 7.8.1.x
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
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Article contents: Vulnerability Description
An authenticated Web Gateway administrator can increase their privileges until they have full control of the system by exploiting a directory traversal vulnerability of the Web Gateway UI.

An authenticated Web Gateway administrator can execute system commands by modifying a configuration of the Web Gateway UI.
To remediate this issue, go to the Product Downloads site, and download the applicable product file.

The main release is not affected by these vulnerabilities.
Product Type Version File Name Release Date
Web Gateway Controlled Release 7.8.2 and later mwgappl- July 10, 2018
Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, security updates, 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.
None for CVE-2018-6677 or CVE-2018-6678. McAfee strongly encourages installing the provided release specified in the Remediation table.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not?
For Appliances:
Use the following instructions for Appliance-based products:
  1. Open the Administrator's User Interface (UI).
  2. Click the About link. 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?
  1. CVE-2018-6677
    Base Score 7.6
    Attack Vector (AV) Network (N)
    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) 7.3
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Confirmed (X)
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
  2. CVE-2018-6678
    Base Score 3.4
    Attack Vector (AV) Network (N)
    Attack Complexity (AC) Low (L)
    Privileges Required (PR) High (H)
    User Interaction (UI) Required (R)
    Scope (S) Changed (C)
    Confidentiality (C) None (N)
    Integrity (I) None (N)
    Availability (A) Low (L)
    Temporal Score (Overall) 3.2
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Reasonable (R)
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
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 of 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, 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.
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.
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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