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Intel Security - Security Bulletin: Fixes for privilege escalation via MAP_PRIVATE COW breakage (CVE-2016-5195)
Security Bulletins ID:   SB10176
Last Modified:  12/7/2016

Summary

First Published: 12/05/2016
 
 Impact of Vulnerability:  Privilege escalation (CWE-266)
 CVE Numbers:  CVE-2016-5195
 Severity Rating:  Medium
 Base / Overall CVSS v3 Scores:  6.7 / 6.0
 Recommendations:  Install Data Exchange Layer (DXL) Platform 3.0.0.334.1 (Hotfix 3)
 Install DXL Platform 3.0.1.182.1 (Hotfix 1)
 Install Data Loss Prevention (DLP) Prevent Hotfix 10.0.101
 Install McAfee Active Response (MAR) 1.1.0.245 (Hotfix 8)
 Install Threat Intelligence Exchange (TIE) server 2.0.0.653 (Hotfix 1)
 Security Bulletin Replacement:  None
 Affected Software:  DLP Prevent 10.0.100
 DXL Platform 3.0.1 and earlier
 MAR 1.1.0
 TIE server 2.0.0 and earlier
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

Description

CVE-2016-5195: kernel: mm: privilege escalation via MAP_PRIVATE COW breakage
A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system.

CWE-266: Incorrect Privilege Assignment
A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

Remediation

This issue is resolved in the following releases:
  • DLP Prevent Hotfix 10.0.101 for virtual and hardware platforms
  • DXL Platform 3.0.0.334.1 (Hotfix 3)
  • DXL Platform 3.0.1.182.1 (Hotfix 1)
  • MAR 1.1.0.245 (Hotfix 8)
  • TIE server 2.0.0.653 (Hotfix 1)
Go to the Product Downloads site and download the applicable product hotfix file:
 
Product Major Version Patch Number Patch File Name Release Date
DLP Prevent 10.0 101 McAfee-PS-10.0-3378.100.iso December 5, 2016
DXL Platform 3.0.0 334 DXLPlatform_3.0.0_Build_334_Package_1_(ENU-LICENSED-RELEASE-BRANCH).zip November 21, 2016
DXL Platform 3.0.1  182 DXLPlatform_3.0.1_Build_182_Package_1_(ENU-LICENSED-RELEASE-BRANCH).zip November 30, 2016
MAR 1.1.0 245 MAR-1.1.0.0-245.x86_64.iso
ActiveResponsePlatform-1.1.0-245.zip
November 4, 2016
TIE server 2.0.0 653 TIEServer_2.0.0.653.x86_64-MAIN.ova December 6, 2016

Download and Installation Instructions
See KB56057 for instructions on how to download Intel Security / 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

None. Install the provided hotfix updates.

Mitigations

DLP Prevent does not have unprivileged user accounts other than the built-in admin account. A successful exploit of this vulnerability requires the admin account to be compromised.

Acknowledgements

Intel Security credits Phil Oester for the discovery and Linus Torvalds for the Linux kernel patch.

Frequently Asked Questions (FAQs)

How do I know whether my Intel Security product is vulnerable or not?

For Endpoint products:
Use the following instructions for endpoint or client based products:
  1. Right-click on the McAfee tray shield icon on the Windows task bar.
  2. Select Open Console.
  3. In the console, select Action Menu.
  4. In the Action Menu, select Product Details. 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, please visit the CVSS website at: http://www.first.org/cvss/.

When calculating CVSS scores, Intel Security 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 successful exploitation of the issue being scored
 
What are the CVSS scoring metrics that have been used?
 
CVE-2016-5195: kernel: mm: privilege escalation via MAP_PRIVATE COW breakage
 
 Base Score 6.7
 Attack Vector (AV) Local
 Attack Complexity (AC) Low
 Privileges Required (PR) High
 User Interaction (UI) None
 Scope (S) Unchanged
Confidentiality (C) High
Integrity (I) High
Availability (A) High
 Temporal Score (Overall) 6.0
 Exploitability (E) Proof-of-concept
 Remediation Level (RL) Official fix
 Report Confidence (RC) Confirmed

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:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Where can I find a list of all security bulletins or how do I report a product vulnerability?
To find a list of all security bulletins, or if you have information about a security issue or vulnerability with an Intel Security product, please visit our product security website at: http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx.

Resources

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Disclaimer

The information provided in this security bulletin is provided as is without warranty of any kind. Intel Security disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Intel Security or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if Intel Security 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 foregoing 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 cancelled at any time.

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