VMware ESXi, Workstation and Fusion updates address side-channel analysis due to speculative execution. (VMSA-2018-0002)

Original Release Date: January 5, 2018
Last Revised: June 14, 2018
Number: ASA-2018-011
Overall Severity Classification: Medium
Advisory Version: 4.0
Advisory Status: Final

1. Overview:

VMware® issued security advisory VMSA-2018-0002 to address one or more security vulnerabilities.

CPU data cache timing can be abused to efficiently leak information out of mis-speculated CPU execution, leading to (at worst) arbitrary virtual memory read vulnerabilities across local security boundaries in various contexts. (Speculative execution is an automatic and inherent CPU performance optimization used in all modern processors.) ESXi, Workstation and Fusion are vulnerable to Bounds Check Bypass and Branch Target Injection issues resulting from this vulnerability. Result of exploitation may allow for information disclosure from one Virtual Machine to another Virtual Machine that is running on the same host. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the identifiers CVE-2017-5753 (Bounds Check bypass) and CVE-2017-5715 (Branch Target Injection) to these issues.

VMware Security Advisory:

Certain Avaya products are supported on a VMware ESXi Virtualization Platform and may be affected.

2. Avaya System Products using a modified version of VMware ESXi:

For assessment and severity classification details refer to Section 3 of Avaya's Product Security Vulnerability Response Policy.
The "Resolution" column will be updated as fixes are made available. Please reference the "Information" column for any additional information regarding the affected product.

Product: Version(s): Resolution: Information:
Avaya Aura® Appliance Virtualization Platform 7.0 through 7.1.2 7.1.3 See PSN020346u for details on the remediaton and installation instructions for Avaya Aura® products.

Recommended Actions for System Products:
Avaya strongly recommends following networking and security best practices by implementing firewalls, ACLs, physical security or other appropriate access restrictions. Though Avaya believes such restrictions should always be in place, risk to Avaya products and the surrounding network from this potential vulnerability may be mitigated by ensuring these practices are implemented until such time as an Avaya provided product update or the recommended Avaya action is applied. Further restrictions as deemed necessary based on the customer's security policies may be required during this interim period, but the System Product operating system or application should not be modified unless the change is approved by Avaya. Making changes that are not approved may void the Avaya product service contract.

CVSS 3.0 Scoring and Metrics:

Avaya uses the Common Vulnerability Scoring System version 3 (CVSSv3) base score and metrics as reported by the vendor for the affected component(s) or by the National Institute of Standards and Technology in the National Vulnerability Database. In some cases, such as where CVSS information is not available from the vendor or NIST, Avaya will calculate the CVSSv3 base score and metrics. Customers are encouraged to calculate the Temporal and Environmental CVSSv3 scores to determine how the vulnerability could affect their specific implementation or environment. For more information on CVSS and how the score is calculated, see Common Vulnerability Scoring System v3.0: Specification Document.

Vulnerability CVSSv3 Base Score CVSSv3 Metrics
CVE-2017-5715
5.6 (Medium) CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
CVE-2017-5753
5.6 (Medium) CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

3. Avaya Products installed on a VMware ESXi Virtualized Platform:

For Avaya products installed on a customer supplied VMware ESXi system, Avaya recommends installing the VMware ESXi patch as detailed in the security advisory VMSA-2018-0002

Recommended Actions for Products running on VMware ESXi:
Avaya strongly recommends that customers follow networking and security best practices by implementing firewalls, ACLs, physical security or other appropriate access restrictions. Though Avaya believes such restrictions should always be in place, risk to Avaya products and the surrounding network from this potential vulnerability may be mitigated by ensuring these practices are implemented until such time as the recommended update is applied. Further restrictions as deemed necessary based on the customer's security policies may be required during this interim period.

4. Additional Information:

Additional information may also be available via the Avaya support website and through your Avaya account representative. Please contact your Avaya product support representative, or dial 1-800-242-2121, with any questions.

5. Disclaimer:

ALL INFORMATION IS BELIEVED TO BE CORRECT AT THE TIME OF PUBLICATION, IS PROVIDED "AS IS", AND IS APPLICABLE ONLY TO PRODUCT VERSIONS ELIGIBLE FOR MANUFACTURER SUPPORT IN ACCORDANCE WITH AVAYA PRODUCT LIFE CYCLE POLICY. AVAYA INC., ON BEHALF ITSELF AND ITS SUBSIDIARIES AND AFFILIATES (HEREINAFTER COLLECTIVELY REFERRED TO AS "AVAYA"), DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND FURTHERMORE, AVAYA MAKES NO REPRESENTATIONS OR WARRANTIES THAT THE STEPS RECOMMENDED WILL ELIMINATE SECURITY OR VIRUS THREATS TO CUSTOMERS' SYSTEMS. IN NO EVENT SHALL AVAYA BE LIABLE FOR ANY DAMAGES WHATSOEVER ARISING OUT OF OR IN CONNECTION WITH THE INFORMATION OR RECOMMENDED ACTIONS PROVIDED HEREIN, INCLUDING DIRECT, INDIRECT, INCIDENTAL, STATUTORY, CONSEQUENTIAL DAMAGES, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF AVAYA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

THE INFORMATION PROVIDED HERE DOES NOT AFFECT THE SUPPORT AGREEMENTS IN PLACE FOR AVAYA PRODUCTS. SUPPORT FOR AVAYA PRODUCTS CONTINUES TO BE EXECUTED AS PER EXISTING AGREEMENTS WITH AVAYA.

6. Revision History:

V 1.0 - January 5, 2018 - Initial Statement issued.
V 2.0 - January 15, 2018 - Updated Overview section with additional information from VMWare. Fixed incorrect version for AVP in affected products table.
V 3.0 - February 13, 2018 - Updated Overall Severity Classification and CVSS scores to reflect updated scores from NIST NVD.
V 4.0 - June 14, 2018 - Updated affected versions and Information for AVP. Set status to Final.

Avaya customers or Business Partners should report any security issues found with Avaya products via the standard support process.
Independent security researchers can contact Avaya at securityalerts@avaya.com.

VMware® is the registered trademark of VMware Inc. in the U.S. and other countries.

© 2018 Avaya Inc. All Rights Reserved. All trademarks identifying Avaya products by the ® or ™ are registered trademarks or trademarks, respectively, of Avaya Inc. All other trademarks are the property of their respective owners.