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McAfee Security Bulletin - Web Gateway update fixes several vulnerabilities (CVE-2018-6667, CVE-2018-1124, CVE-2017-12940, CVE-2017-12941, and CVE-2017-12942)
Security Bulletins ID:   SB10241
Last Modified:  6/12/2018

Summary

First Published: June 12, 2018
 
 Impact of Vulnerability: CVE-2018-6667: Remote code execution
CVE-2018-1124: procps-ng / procps: Privilege escalation
CVE-2017-12940: Unrar: Denial of service
CVE-2017-12941: Unrar: Denial of service
CVE-2017-12942: Unrar: Denial of service
 CVE Numbers: CVE-2018-6667
CVE-2018-1124
CVE-2017-12940
CVE-2017-12941
CVE-2017-12942
 Severity Rating: CVE-2018-6667: Critical
CVE-2018-1124: High
CVE-2017-12940: Medium
CVE-2017-12941: Medium
CVE-2017-12942: Medium
 CVSS v3 Base / Temporal Scores: CVE-2018-6667: 10.0 / 9.5
CVE-2018-1124: 7.3 / 7.0
CVE-2017-12940: 6.5 / 6.2
CVE-2017-12941: 6.5 / 6.2
CVE-2017-12942: 6.5 / 6.2
 Recommendations: Install or update to McAfee Web Gateway (MWG) 7.8.1.6 (Controlled Release)
Install or update to MWG 7.7.2.14 (Main Release)
 Security Bulletin Replacement: None
 Affected Software: CVE-2018-6667: MWG 7.8.1.x
CVE-2018-1124: MWG 7.6.x, MWG 7.7.x, and MWG 7.8.x
CVE-2017-12940, CVE-2017-12941, and CVE-2017-12942: MWG 7.6.x, MWG 7.7.x, and MWG 7.8.x
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents: Vulnerability Description
CVE-2018-6667:
Authentication Bypass vulnerability in the administrative user interface in McAfee Web Gateway 7.8.1.0 through 7.8.1.5 allows remote attackers to execute arbitrary code via Java management extensions (JMX).
https://nvd.nist.gov/vuln/detail/CVE-2018-6667
NOTE: The above link was not yet populated with CVE details at the time of publication of this Security Bulletin.

The JMX service of McAfee Web Gateway UI was configured insecurely to listen on port 1099 on all interfaces. The service does not require authentication, allowing a user to connect, interact with the service, and execute user controlled code.

CVE-2018-1124:
Multiple integer overflows in procps-ng (procps) leading to heap corruption flaws were discovered in file2strvec(). These vulnerabilities can lead to privilege escalation for a local attacker who can create entries in procfs by starting processes, which will lead to crashes or arbitrary code execution in proc utilities run by other users (for example, pgrep, pkill, and pidof).
https://nvd.nist.gov/vuln/detail/CVE-2018-1124

CVE-2017-12940:
libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read in the EncodeFileName::Decode call within the Archive::ReadHeader15 function.
https://nvd.nist.gov/vuln/detail/CVE-2017-12940

CVE-2017-12941:
libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read in the Unpack::Unpack20 function.
https://nvd.nist.gov/vuln/detail/CVE-2017-12941

CVE-2017-12942:
libunrar.a in UnRAR before 5.5.7 has a buffer overflow in the Unpack::LongLZ function.
https://nvd.nist.gov/vuln/detail/CVE-2017-12942
Remediation
Go to the Product Downloads site and download the applicable product release:
 
Product Type Version File Name Release Date
MWG  Controlled Release 7.8.1.6 or later mwgappl-7.8.1.6.0-26087-x.86_64.iso June 4, 2018
MWG Main Release 7.7.2.14 or later mwgappl-7.7.2.14.0-26153-x.86_64.iso June 12, 2018

NOTE: CVE-2018-1124 is not fixed in the Controlled Release. To exploit this vulnerability an attacker needs to have shell access, which is only available for administrators. The fix will be included in the next Controlled Release.

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
CVE-2018-6667: Access to TCP port 1099 should be forbidden by a firewall to reduce the attack surface.
CVE-2018-1124: None
CVE-2017-12940, CVE-2017-12941, and CVE-2017-12942: None
    
Installing the provided release specified in the Remediation table is strongly encouraged.
Acknowledgements
Vulnerability CVE-2018-1124 was reported by Qualys: https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt.

Vulnerabilities CVE-2017-12940, CVE-2017-12941, and CVE-2017-12942 were reported on SECLISTS.ORG: http://seclists.org/oss-sec/2017/q3/290.
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?

CVE-2018-6667:

 
Base Score 10.0
Attack Vector (AV) Network (N)
Attack Complexity (AC) Low (L)
Privileges Required (PR) None (N)
User Interaction (UI) None (N)
Scope (S) Changed (C)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
Temporal Score (Overall) 9.5
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:C/C:H/I:H/A:H/RL:O
       
CVE-2018-1124:
 
Base Score 7.3
Attack Vector (AV) Local (L)
Attack Complexity (AC) Low (L)
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) 7.0
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:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/RL:O
 
CVE-2017-12940:
 
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) None (N)
Integrity (I) Low (L)
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:N/I:L/A:L/RL:O
 
CVE-2017-12941:
 
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) None (N)
Integrity (I) Low (L)
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:N/I:L/A:L/RL:O
 
CVE-2017-12942:
 
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) None (N)
Integrity (I) Low (L)
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:N/I:L/A:L/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, 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 may 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
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.
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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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