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McAfee Security Bulletin - Web Gateway update fixes several vulnerabilities (CVE-2018-7170, CVE-2018-7182, CVE-2018-7183, CVE-2018-7184, CVE-2018-7185, CVE-2018-5732, and CVE-2018-5733)
Security Bulletins ID:   SB10231
Last Modified:  4/17/2018

Summary

First Published: April 12, 2018
 
 Impact of Vulnerability: CVE-2018-7170: NTPD: Denial of service
CVE-2018-7182: NTPD: Denial of service
CVE-2018-7183: NTPQ: Potential code injection
CVE-2018-7184: NTPD: Denial of service
CVE-2018-7185: NTPD: Denial of service
CVE-2018-5732: DHCP: Potential code injection
CVE-2018-5733: DHCP: Denial of service
 CVE Numbers: CVE-2018-7170
CVE-2018-7182
CVE-2018-7183
CVE-2018-7184
CVE-2018-7185
CVE-2018-5732
CVE-2018-5733
 Severity Rating: CVE-2018-7170: Low
CVE-2018-7182: Medium
CVE-2018-7183: High
CVE-2018-7184: Low
CVE-2018-7185: Low
CVE-2018-5732: High
CVE-2018-5733: Low
 CVSS v3 Base / Temporal Scores: CVE-2018-7170: 3.1 / 3.0
CVE-2018-7182: 5.3 / 5.1
CVE-2018-7183: 7.1 / 6.8
CVE-2018-7184: 3.7 / 3.6
CVE-2018-7185: 3.7 / 3.6
CVE-2018-5732: 8.1 / 7.7
CVE-2018-5733: 3.7 / 3.6
 Recommendations: Install or update to McAfee Web Gateway (MWG) 7.7.2.12 or later
Install or update to MWG 7.8.1.4 or later
 Security Bulletin Replacement: None
 Affected Software: MWG 7.7 until and including MWG 7.7.2.11
MWG 7.8 until and including MWG 7.8.1.3
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents: Vulnerability Description
NOTE:
Some of the following links were not yet populated with CVE details by Red Hat at the time of publication of this Security Bulletin.

CVE-2018-7170:
NTPD allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of NTPD, and modify a victim's clock via a Sybil attack.
https://nvd.nist.gov/vuln/detail/CVE-2018-7170

CVE-2018-7182:
The ctl_getitem method in NTPD allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet.
https://nvd.nist.gov/vuln/detail/CVE-2018-7182
 
CVE-2018-7183:
A Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute arbitrary code, by leveraging an ntpq query and sending a response with a crafted array.
https://nvd.nist.gov/vuln/detail/CVE-2018-7183
 
CVE-2018-7184:
NTPD drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp, causing the association to reset and setting the contents of the packet as the most recent timestamp.
https://nvd.nist.gov/vuln/detail/CVE-2018-7184
 
CVE-2018-7185:
The protocol engine in ntp allows a remote attacker to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim NTPD to reset its association.
https://nvd.nist.gov/vuln/detail/CVE-2018-7185
 
CVE-2018-5732:
An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines, via a crafted DHCP response packet.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-5732

CVE-2018-5733:
A denial of service flaw was found in the way DHCPD handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing DHCPD to crash, by sending large amounts of traffic.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-5733

Remediation
Go to the Product Downloads site and download the applicable product release:
 
Product Type Version File Name Release Date
MWG Maintenance Release 7.7.2.12 (or later) mwgappl-7.7.2.12.0-25772-x.86_64.iso April 10, 2018
MWG Feature Release 7.8.1.4 (or later) mwgappl-7.8.1.4.0-25775-x.86_64.iso April 10, 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.
 
Workaround
NTPD is in use according to default. Although the use of DHCP is uncommon for a server system, we strongly encourage installing the provided release specified in the Remediation table.
 
Acknowledgements
Vulnerability CVE-2018-7170 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-7170
Vulnerability CVE-2018-7182 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-7182
Vulnerability CVE-2018-7183 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-7183
Vulnerability CVE-2018-7184 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-7184
Vulnerability CVE-2018-7185 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-7185
Vulnerability CVE-2018-5732 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-5732
Vulnerability CVE-2018-5733 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-5733
 
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not?
For Appliances:
Follow these 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?

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)
 
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
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
CVE-2018-7182:
 
Base Score 5.3
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) Low (L)
Temporal Score (Overall) 5.1
Exploitability (E) Not Defined (X)
Remediation Level (RL) Official Fix (O)
Report Confidence (RC) Not Defined (X)
 
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:L/RL:O
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
CVE-2018-7183:
 
Base Score 7.1
Attack Vector (AV) Network (N)
Attack Complexity (AC) High (H)
Privileges Required (PR) Low (L)
User Interaction (UI) Required (R)
Scope (S) Unchanged (U)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
Temporal Score (Overall) 6.8
Exploitability (E) Not Defined (X)
Remediation Level (RL) Official Fix (O)
Report Confidence (RC) Not Defined (X)
 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/RL:O
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
CVE-2018-7184:
 
Base Score 3.7
Attack Vector (AV) Network (N)
Attack Complexity (AC) High (H)
Privileges Required (PR) None (N)
User Interaction (UI) None (N)
Scope (S) Unchanged (U)
Confidentiality (C) None (N)
Integrity (I) None (N)
Availability (A) Low (L)
Temporal Score (Overall) 3.6
Exploitability (E) Not Defined (X)
Remediation Level (RL) Official Fix (O)
Report Confidence (RC) Not Defined (X)
 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:O
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
CVE-2018-7185:
 
Base Score 3.7
Attack Vector (AV) Network (N)
Attack Complexity (AC) High (H)
Privileges Required (PR) None (N)
User Interaction (UI) None (N)
Scope (S) Unchanged (U)
Confidentiality (C) None (N)
Integrity (I) None (N)
Availability (A) Low (L)
Temporal Score (Overall) 3.6
Exploitability (E) Not Defined (X)
Remediation Level (RL) Official Fix (O)
Report Confidence (RC) Not Defined (X)
 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:O
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
CVE-2018-5732:
 
Base Score 8.1
Attack Vector (AV) Network (N)
Attack Complexity (AC) High (H)
Privileges Required (PR) None (N)
User Interaction (UI) None (N)
Scope (S) Unchanged (U)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
Temporal Score (Overall) 7.7
Exploitability (E) Not Defined (X)
Remediation Level (RL) Official Fix (O)
Report Confidence (RC) Not Defined (X)
 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/RL:O
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
CVE-2018-5733:
 
Base Score 3.7
Attack Vector (AV) Network (N)
Attack Complexity (AC) High (H)
Privileges Required (PR) None (N)
User Interaction (UI) None (N)
Scope (S) Unchanged (U)
Confidentiality (C) None (N)
Integrity (I) None (N)
Availability (A) Low (L)
Temporal Score (Overall) 3.6
Exploitability (E) Not Defined (X)
Remediation Level (RL) Official Fix (O)
Report Confidence (RC) Not Defined (X)
 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:O
NOTE: The above CVSS version 3.0 vector was used to generate this score.
 
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
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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 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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