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McAfee Security Bulletin - Email Gateway 7.6 update fixes OpenSSH vulnerabilities (CVE-2016-6515, CVE-2014-2653, CVE-2016-10010, and CVE-2018-0739)
Security Bulletins ID:   SB10239
Last Modified:  6/12/2018

Summary

First Published: June 12, 2018
 
 Impact of Vulnerability: Authentication Issue (CWE-287)
Broken Authentication and Session Management (CWE-930, OWASP 2013:A2)
Denial of Service (CWE-730, OWASP 2004:A9)
 CVE ID: CVE-2016-6515
 Severity Rating: Medium
 CVSS v3 Base/Temporal Scores: 5.3
 Recommendations: Install or update to McAfee Email Gateway (MEG) 7.6.406h1219837-3484.100
 Security Bulletin Replacement: None
 Affected Software: MEG 7.6 and earlier
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
 Impact of Vulnerability: Application Protections Bypass (CWE-592)
Broken Authentication and Session Management (CWE-930, OWASP 2013:A2)
Permissions, Privileges, and Access Control (CWE-264)
 CVE ID: CVE-2014-2653
 Severity Rating: Medium
 CVSS v3 Base/Temporal Scores: 4.3
 Recommendations: Install or update to MEG 7.6.406h1219837-3484.100
 Security Bulletin Replacement: None
 Affected Software: MEG 7.6 and earlier
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
 Impact of Vulnerability: Authentication Issue (CWE-287)
Permissions, Privileges, and Access Control (CWE-264)
Privilege Escalation (CWE-274)
 CVE ID: CVE-2016-10010
 Severity Rating: High
 CVSS v3 Base/Temporal Scores: 7.5
 Recommendations: Install or update to MEG-7.6.406h1219837-3484.100
 Security Bulletin Replacement: None
 Affected Software: MEG 7.6 and earlier
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
 
 Impact of Vulnerability: Denial of Service (CWE-730, OWASP 2004:A9)
 CVE ID: CVE-2018-0739
 Severity Rating: Medium
 CVSS v3 Base/Temporal Scores: 6.5
 Recommendations: Install or update to MEG-7.6.406h1219837-3484.100
 Security Bulletin Replacement: None
 Affected Software: MEG 7.6 and earlier
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents: Vulnerability Description
This update resolves all of the following vulnerabilities.
  1. CVE-2016-6515
    It was found that OpenSSH did not limit password lengths for password authentication. A remote unauthenticated attacker could use this flaw to temporarily trigger high CPU consumption in sshd by sending long passwords.
    http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-6515
     
  2. CVE-2014-2653
    It was discovered that OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record.
    https://nvd.nist.gov/vuln/detail/CVE-2014-2653
     
  3. CVE-2016-10010
    sshd in OpenSSH before 7.4, when privilege separation is not used, creates forwarded UNIX-domain sockets as root, which might allow local users to gain privileges via unspecified vectors, related to serverloop.c.
    https://nvd.nist.gov/vuln/detail/CVE-2016-10010
     
  4. CVE-2018-0739
    Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe.
    https://nvd.nist.gov/vuln/detail/CVE-2018-0739
Affected Component:
  • MEG 7.6
Remediation
To remediate this issue, go to the Product Downloads site, and download and apply the applicable product hotfix file:
 
Product Version Type File Name Release Date
MEG 7.6 7.6.406h1219837-3484.100 Hotfix MEG-7.6.406h1219837-3484.100.zip June 12, 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.

Acknowledgements
These vulnerabilities were first disclosed by The MITRE Corporation as CVEs.

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-2016-6515
     
    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) 5.3
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Not Defined (X)
    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:L
     
  2. CVE-2014-2653
     
    Base Score 4.3
    Attack Vector (AV) Network (N)
    Attack Complexity (AC) Low (L)
    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) 4.3
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Not Defined (X)
    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:L/UI:N/S:U/C:N/I:L/A:N
     
  3. CVE-2016-10010
     
    Base Score 7.5
    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) High (H)
    Integrity (I) High (H)
    Availability (A) High (H)
    Temporal Score (Overall) 7.5 
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Not Defined (X)
    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:H/I:H/A:H
     
  4. CVE-2018-0739
     
    Base Score 6.5
    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) None (N)
    Availability (A) High (H)
    Temporal Score (Overall) 6.5 
    Exploitability (E) Not Defined (X)
    Remediation Level (RL) Not Defined (X)
    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:N/A:H
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, patch, 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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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.
 
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