1. Impacted Products

• AppDefense
• Container Service Extension
• Enterprise PKS
• Horizon DaaS
• Hybrid Cloud Extension
• Identity Manager
• Integrated OpenStack
• NSX for vSphere
• NSX-T Data Center
• Pulse Console
• SD-WAN Edge by VeloCloud
• SD-WAN Gateway by VeloCloud
• SD-WAN Orchestrator by VeloCloud
• Skyline Collector
• Unified Access Gateway
• vCenter Server Appliance
• vCloud Availability Appliance
• vCloud Director For Service Providers
• vCloud Usage Meter
• vRealize Automation
• vRealize Business for Cloud
• vRealize Code Stream
• vRealize Log Insight
• vRealize Network Insight
• vRealize Operations Manager
• vRealize Orchestrator Appliance
• vRealize Suite Lifecycle Manager
• vSphere Data Protection
• vSphere Integrated Containers
• vSphere Replication
  

2. Introduction

Several vulnerabilities in the Linux kernel implementation of TCP Selective Acknowledgement (SACK) have been disclosed. These issues may allow a malicious entity to execute a Denial of Service attack against affected products.

3. Linux kernel vulnerabilities in TCP Selective Acknowledgement (SACK) CVE-2019-11477, CVE-2019-11478

Description:

There are two uniquely identifiable vulnerabilities associated with the Linux kernel implementation of SACK:

• CVE-2019-11477 - SACK Panic - A sequence of SACKs may be crafted such that one can trigger an integer overflow, leading to a kernel panic. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 7.5.
• CVE-2019-11478 - SACK  Excess Resource Usage - a crafted sequence of SACKs will fragment the TCP retransmission queue, causing resource exhaustion. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

Known Attack Vectors:

A malicious actor must have network access to an affected system including the ability to send traffic with low MSS values to the target.  Successful exploitation of these issues may cause the target system to crash or significantly degrade performance.

Resolution:

To remediate CVE-2019-11477 and CVE-2019-11478 update/upgrade to the versions listed in the 'Fixed Version' column of the 'Resolution Matrix' found below.

Workarounds:

Some VMware Virtual Appliances can workaround CVE-2019-11477 and CVE-2019-11478 by either disabling SACK or by modifying the built in firewall (if available) in the base OS of the product to drop incoming connections with a low MSS value. In-product workarounds (if available) have been enumerated in the 'Workarounds' column of the 'Resolution Matrix' found below.

Additional Documentations:

None.

Acknowledgements:

None.

Response Matrix:

4. References

Mitre CVE Dictionary Links:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11477

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478

Fixed Version(s) and Release Notes:

AppDefense 2.2.1

Downloads:

https://my.vmware.com/web/vmware/details?downloadGroup=APPDEFENSE-221&productId=742&rPId=35078

Documentation:

https://docs.vmware.com/en/VMware-AppDefense/221/rn/appdefense-plugin-221-release-notes.html

Enterprise PKS 1.3.7

Download:
https://network.pivotal.io/products/pivotal-container-service/#/releases/384407
Documentation:
https://docs.vmware.com/en/VMware-Enterprise-PKS/1.3/rn/VMware-PKS-13-Release-Notes.html#v1.3.7

Site Recovery Manager 8.2.0.1 Virtual Appliance
Downloads and Documentation:
https://my.vmware.com/web/vmware/details?downloadGroup=SRM8201&productId=889&rPId=35694

Unified Access Gateway 3.6

Downloads and Documentation:

https://my.vmware.com/web/vmware/details?downloadGroup=UAG-36&productId=897&rPId=34577

vCenter Server Appliance 6.7u2c
Downloads and Documentation:

https://my.vmware.com/web/vmware/details?downloadGroup=VC67U2C&productId=742&rPId=34693

vCenter Server Appliance 6.5u3

Downloads and Documentation:

https://my.vmware.com/web/vmware/details?downloadGroup=VC65U3&productId=614&rPId=34639

SD-WAN Edge by VeloCloud 3.3.0

Downloads and Documentation:
https://my.vmware.com/web/vmware/details?downloadGroup=SD-WAN-EDGE-330&productId=899&rPId=34579

SD-WAN Gateway by VeloCloud 3.3.0
Downloads and Documentation:
https://my.vmware.com/web/vmware/details?downloadGroup=SD-WAN-VCG-330&productId=899&rPId=34582

SD-WAN Orchestrator by VeloCloud 3.3.0
Downloads and Documentation:
https://my.vmware.com/web/vmware/details?downloadGroup=SD-WAN-ORC-330-2&productId=899&rPId=34580

vSphere Replication 8.2.0.1
Downloads and Documentation:
https://my.vmware.com/web/vmware/details?downloadGroup=VR8201&productId=742&rPId=35626

vSphere Replication 6.5.1.4
Downloads and Documentation:
https://my.vmware.com/web/vmware/details?downloadGroup=VR6514&productId=614&rPId=35279

Workarounds:

https://kb.vmware.com/s/article/70900
https://kb.vmware.com/s/article/70899
https://kb.vmware.com/s/article/71311
https://kb.vmware.com/s/article/70892
https://kb.vmware.com/s/article/71029

5. Change log
 

2019-07-02: VMSA-2019-0010

Initial security advisory detailing remediations and/or workarounds for SD-WAN, Unified Access Gateway, vCenter Server Appliance, and vCloud Director For Service Providers.

2019-07-24: VMSA-2019-0010.1

Updated security advisory with remediation information for the vCenter 6.7 and AppDefense 2.x release lines and removed Horizon from affected products as it was incorrectly listed.

2019-08-08: VMSA-2019-0010.2

Updated security advisory with remediation information for the vSphere Replication 6.5.x release line.

6. Contact

E-mail list for product security notifications and announcements:

https://lists.vmware.com/cgi-bin/mailman/listinfo/security-announce

This Security Advisory is posted to the following lists:

  security-announce@lists.vmware.com

  bugtraq@securityfocus.com

  fulldisclosure@seclists.org

E-mail: security@vmware.com

PGP key at:

https://kb.vmware.com/kb/1055

VMware Security Advisories

https://www.vmware.com/security/advisories

VMware Security Response Policy

https://www.vmware.com/support/policies/security_response.html

VMware Lifecycle Support Phases

https://www.vmware.com/support/policies/lifecycle.html

VMware Security & Compliance Blog  

https://blogs.vmware.com/security

Twitter

https://twitter.com/VMwareSRC

Copyright 2019 VMware Inc. All rights reserved.