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McAfee Security Bulletin - Web Gateway update fixes four third-party vulnerabilities (CVE-2018-18311, CVE-2018-5742, CVE-2019-9169, and CVE-2019-6454)
Security Bulletins ID:   SB10278
Last Modified:  4/9/2019

Summary

First Published: April 9, 2019
 
 Impact of Vulnerability: CVE-2018-18311: perl: Buffer overflow
CVE-2018-5742: bind: Assertion failure
CVE-2019-9169: glibc: Out-Of-Bounds Read
CVE-2019-6454: systemd: Insufficient input validation
 CVE ID: CVE-2018-18311
CVE-2018-5742
CVE-2019-9169
CVE-2019-6454
 Severity Rating: CVE-2018-18311: High
CVE-2018-5742: Medium
CVE-2019-9169: Medium
CVE-2019-6454: Medium 
 CVSS v3 Base/Temporal Scores: CVE-2018-18311: 7.4 / 7.1
CVE-2018-5742: 5.9 / 5.7
CVE-2019-9169: 6.5 / 6.2
CVE-2019-6454: 6.4 / 6.1
 Recommendations: Install or update to McAfee Web Gateway (MWG) 7.7.2.21 (Main Release)
Install or update to MWG 7.8.2.8 (Main Release)
Install or update to MWG 8.1.1 (Controlled Release)
 Security Bulletin Replacement: None
 Affected Software: CVE-2018-18311: MWG 7.7.2 earlier than MWG 7.7.2.21; MWG 7.8.2 earlier than MWG 7.8.2.8, 8.x earlier than 8.1.1
CVE-2018-5742: MWG 7.8.2 earlier than MWG 7.8.2.8, 8.x earlier than 8.1.1
CVE-2019-9169: MWG 7.7.2 earlier than MWG 7.7.2.21; MWG 7.8.2 earlier than MWG 7.8.2.8, 8.x earlier than 8.1.1
CVE-2019-6454: MWG 7.7.2 earlier than MWG 7.7.2.21; MWG 7.8.2 earlier than MWG 7.8.2.8, 8.x earlier than 8.1.1
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
Article contents: Vulnerability Description
These vulnerabilities were reported against the Open Source Operating System that MWG runs on.
  1. CVE-2018-18311   
    Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations. This CVE is also referenced in SB10276 where we implemented a partial fix. These releases contain the complete fix.
     
  2. CVE-2018-5742
    This flaw appears to be exploitable only when debug logging is enabled and set to at least a level of 10. As this configuration should be rare in production instances of bind, it is unlikely that most servers will be exploitable.
     
  3. CVE-2019-9169   
    In the GNU C Library (also known as glibc or libc6) through 2.29, proceed_next_node in posix/regexec.c has a heap-based buffer over-read via an attempted case-insensitive regular-expression match.
     
  4. CVE-2019-6454   
    Systemd allocates a buffer large enough to store the path field of a dbus message without performing enough checks. A local attacker may trigger this flaw by sending a dbus message to systemd with a large path making systemd crash or possibly elevating his privileges.
Remediation
To remediate this issue, go to the Product Downloads site, and download the applicable product update file:
 
Product Version Type File Name Release Date
MWG 7.7.2.21 or later Main Release mwgappl-7.7.2.21.0-28544-x.86_64.iso April 9, 2019
MWG 7.8.2.8 or later Main Release mwgappl-7.8.2.8.0-28536-x.86_64.iso April 9, 2019
MWG 8.1.1 or later Controlled Release mwgappl-8.1.1-28538.x.86_64.iso April 9, 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.
Acknowledgments
Vulnerability CVE-2018-18311 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-18311.

Vulnerability CVE-2018-5742 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2018-5742.

Vulnerability CVE-2019-9169 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2019-9169.

Vulnerability CVE-2019-6454 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2019-6454.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not?
For Appliances:
Use the following instructions for MWG:
  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-2018-18311: perl: Buffer overflow
     
    Base Score 7.4
    Attack Vector (AV) Local (L)
    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) 7.1
    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:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/RL:O
     
  2. CVE-2018-5742: bind: Assertion failure
     
    Base Score 5.9
    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) High (H)
    Temporal Score (Overall) 5.7
    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:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O
     
  3. CVE-2019-9169: glibc: Out-Of-Bounds Read
     
    Base Score 6.5
    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) Low (L)
    Integrity (I) None (N)
    Availability (A) Low (L)
    Temporal Score (Overall) 6.2
    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:L/I:N/A:L/RL:O
     
  4. CVE-2019-6454: systemd: Insufficient input validation
     
    Base Score 6.4
    Attack Vector (AV) Local (L)
    Attack Complexity (AC) High (H)
    Privileges Required (PR) High (H)
    User Interaction (UI) None (N)
    Scope (S) Unchanged (U)
    Confidentiality (C) High (H)
    Integrity (I) High (H)
    Availability (A) High (H)
    Temporal Score (Overall) 6.1
    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:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/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?
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, 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.
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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.
 
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