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McAfee Security Bulletin - Web Gateway updates fix four vulnerabilities (CVE-2019-3581, CVE-2018-11784, CVE-2018-12327, and CVE-2018-7170)
Security Bulletins ID:   SB10264
Last Modified:  1/8/2019

Summary

First Published: January 8, 2019
 
 Impact of Vulnerability: CVE-2019-3581: Improper input validation
CVE-2018-11784: Improper control of resource identifiers
CVE-2018-12327: Stack based buffer overflow
CVE-2018-7170:
 CVE ID: CVE-2019-3581
CVE-2018-11784
CVE-2018-12327
CVE-2018-7170
 Severity Rating: CVE-2019-3581: High
CVE-2018-11784: Medium
CVE-2018-12327: High
CVE-2018-7170: Low
 CVSS v3 Base/Temporal Scores: CVE-2019-3581: 7.5 / 7.2
CVE-2018-11784: 4.3 / 4.1
CVE-2018-12327: 7.0 / 6.7
CVE-2018-7170: 3.1 / 3.0
 Recommendations: Install or update to McAfee Web Gateway (MWG) 7.7.2.19
Install or update to MWG 7.8.2.5 (Main Release)
Install or update to MWG 8.0.2 (Controlled Release)
 Security Bulletin Replacement: None
 Affected Software: CVE-2019-3581:
  • 7.8.2 earlier than 7.8.2.5
  • 8.0 earlier than 8.0.2
CVE-2018-11784:
  • 7.7.2 earlier than 7.7.2.19
  • 7.8.2 earlier than 7.8.2.5
  • 8.0 earlier than 8.0.2
CVE-2018-12327:
  • 7.7.2 earlier than 7.7.2.19
  • 7.8.2 earlier than 7.8.2.5
  • 8.0 earlier than 8.0.2
CVE-2018-7170:
  • 7.7.2 earlier than 7.7.2.19
  • 7.8.2 earlier than 7.8.2.5
  • 8.0 earlier than 8.0.2
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
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Article contents: Vulnerability Description
These updates resolve all of the following vulnerabilities.

CVE-2019-3581:
An unauthenticated user can cause a denial of service attack against the proxy component of McAfee Web Gateway.
NOTE: The following link was not yet populated with CVE details at the time of publication of this Security Bulletin.
https://nvd.nist.gov/vuln/detail/CVE-2019-3581

CVE-2018-11784:
When the default servlet in Apache Tomcat returned a redirect to a directory (for example, redirecting to '/foo/' when the user requested '/foo') a specially crafted URL could be used to cause the redirect to be generated to any URI of the attacker's choice.
https://nvd.nist.gov/vuln/detail/CVE-2018-11784

CVE-2018-12327:
The ntpq and ntpdc command-line utilities that are part of the ntp package are vulnerable to stack-based buffer overflow via crafted hostname. Applications using these vulnerable utilities with an untrusted input may be potentially exploited, resulting in a crash or arbitrary code execution under privileges of that application.
https://nvd.nist.gov/vuln/detail/CVE-2018-12327

CVE-2018-7170:
A flaw was found in ntpd making it vulnerable to Sybil attacks. An authenticated attacker could target systems configured to use a trusted key in certain configurations and to create an arbitrary number of associations and subsequently modify a victim's clock.
https://nvd.nist.gov/vuln/detail/CVE-2018-7170

Remediation
To remediate this issue, go to the Product Downloads site, and download the applicable product release file:
 
Product Type Version File Name Release Date
MWG 7.7.2 Update 7.7.2.19 mwgappl-7.7.2.19.0-27616-x.86_64.iso January 8, 2019
MWG 7.8.2 Main Release 7.8.2.5  mwgappl-7.8.2.5.0-27615-x.86_64.iso January 8, 2019
MWG 8.0 Controlled Release 8.0.2 mwgappl-8.0.2-27614-x.86_64.iso January 8, 2019
 
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
CVE-2019-3581:
An administrator can adjust the policy to include a rule at the top of the rule tree to completely eliminate the risk:
 
Condition: String.Length (URL.Host) greater than 254
Action: Block
Applies to: Requests (and IM)

CVE-2018-11784: None
CVE-2018-12327: None    
CVE-2018-7170: None

Installing the provided release specified in the Remediation table is strongly encouraged.
Acknowledgments
Vulnerability CVE-2018-11784 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-11784

Vulnerability CVE-2018-12327 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-12327

Vulnerability CVE-2018-7170 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-7170
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 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?
  1. CVE-2019-3581
     
    Base Score 7.5
    Attack Vector (AV) Network (N)
    Attack Complexity (AC) Low (L)
    Privileges Required (PR) None (N)
    User Interaction (UI) None (N)
    Scope (S) Unchanged (U)
    Confidentiality (C) None (N)
    Integrity (I) None (N)
    Availability (A) High (H)
    Temporal Score (Overall) 7.2
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Not Defined (X)
     
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O
     
  2. CVE-2018-11784
     
    Base Score 4.3
    Attack Vector (AV) Network (N)
    Attack Complexity (AC) Low (L)
    Privileges Required (PR) None (N)
    User Interaction (UI) Required (R)
    Scope (S) Unchanged (U)
    Confidentiality (C) None (N)
    Integrity (I) Low (L)
    Availability (A) None (N)
    Temporal Score (Overall) 4.1
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Not Defined (X)
     
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/RL:O
     
  3. CVE-2018-12327
     
    Base Score 7.0
    Attack Vector (AV) Local (L)
    Attack Complexity (AC) High (H)
    Privileges Required (PR) None (N)
    User Interaction (UI) Required (R)
    Scope (S) Unchanged (U)
    Confidentiality (C) High (H)
    Integrity (I) High (H)
    Availability (A) High (H)
    Temporal Score (Overall) 6.7
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Not Defined (X)
     
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/RL:O
     
  4. CVE-2018-7170
     
    Base Score 3.1
    Attack Vector (AV) Network (N)
    Attack Complexity (AC) High (H)
    Privileges Required (PR) Low (L)
    User Interaction (UI) None (N)
    Scope (S) Unchanged (U)
    Confidentiality (C) None (N)
    Integrity (I) Low (L)
    Availability (A) None (N)
    Temporal Score (Overall) 3.0
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Not Defined (X)
     
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/RL:O
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?
McAfee's key priority is the security of our customers. If a vulnerability is found within any of McAfee's 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
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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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