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  Trend Micro Incorporated                              October 26, 2016

  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Trend Micro(TM) InterScan(TM) Messaging Security Virtual Appliance 9.1
                       Critical Patch - Build 1625
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

     Contents
     ===================================================================

     1.  Overview of this Critical Patch Release

         1.1 Issues

         1.2 Files Included in this Release

     2.  Documentation Set

     3.  System Requirements

     4.  Installation

         4.1 Installing

         4.2 Uninstalling

     5.  Post-Installation Configuration

     6.  Known Issues

     7.  Release History

     8.  Contact Information

     9.  About Trend Micro

     10. License Agreements

     ===================================================================


  1. Overview of this Critical Patch Release
  ======================================================================
     This critical patch upgrades the Linux(TM) kernel in InterScan
     Messaging Security Virtual Appliance (IMSVA) 9.1 to resolve a
     vulnerability.


     1.1 Issues
     ===================================================================
     This critical patch resolves the following issue:

     Issue:    A race condition occurs when the Linux kernel's memory 
               subsystem handles copy-on-write (COW) breakage of private 
               read-only memory mappings. An attacker could use this to 
               gain write access to read-only memory mappings. Anyone
               who has created an unprivileged root account can be
               vulnerable to this issue. 
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~             
     Solution: This critical patch upgrades the Linux kernel to remove
               the vulnerability.

     NOTE:     You must restart all IMSVA's as scheduled after applying 
               this critical patch.


     1.2 Files Included in this Release
     ===================================================================

     A. Files for Current Issues
     -------------------------------------------------------------------
        Files for Issue
     -------------------------------------------------------------------
        Filename                                       Build No.
     -------------------------------------------------------------------
        dracut-004-409.el6_8.2.noarch.rpm              9.1.0.1625
        dracut-kernel-004-409.el6_8.2.noarch.rpm       9.1.0.1625
        kernel-2.6.32-642.6.2.el6.x86_64.rpm           9.1.0.1625
        kernel-firmware-2.6.32-642.6.2.el6.noarch.rpm  9.1.0.1625

     B. Files for Previous Issues
     -------------------------------------------------------------------
        Not applicable.


  2. Documentation Set
  ======================================================================
     To download or view electronic versions of the documentation set 
     for this product, go to http://docs.trendmicro.com.

     In addition to this Readme file, the documentation set for this 
     product includes the following:

     - Online Help: The Online Help contains an overview of features
       and key concepts, and information on configuring and
       maintaining IMSVA.
     
       To access the Online Help, go to http://docs.trendmicro.com

     - Installation Guide (IG): The Installation Guide contains
       information on requirements and procedures for installing and
       deploying IMSVA. 
     
     - Administrator's Guide (AG): The Administrator's Guide contains
       an overview of features and key concepts, and information on
       configuring and maintaining IMSVA.

 
  3. System Requirements
  ======================================================================
     Trend Micro recommends installing IMSVA 9.1 before installing this 
     critical patch, otherwise, the installation will fail.


  4. Installation
  ======================================================================
     This section explains key steps for installing the critical patch.
 
     NOTE: You must install this critical patch on all computers running
           IMSVA 9.1.


     4.1 Installing
     ===================================================================
     To install:
 
     1. Upload the installation package (.tar.gz) to IMSVA using any 
        tool, for example, winscp.
 
     2. Connect to IMSVA through Secure Shell Interface (SSH) using any 
        tool, for example, putty, and log in using the root user 
        account. 

     3. Change to the folder where you uploaded the installation package 
        in step 1. 

     4. Extract the contents of the file using the following command:

        tar -zxvf imsva_91_en_criticalpatch1625.tar.gz

     5. Once the files have been extracted, run the following command
        to go to the installation directory.

        cd ./imsva_91_criticalpatch1625 
 
     6. Run the "./imssinst" command and follow the screen prompts to
        complete installation.

        The following message appears when the system completes the
        installation:

        "Installation is complete. The system must be rebooted for this
        update to take effect."
        
     7. Restart the computer.


     4.2 Uninstalling
     ===================================================================
     No uninstallation steps are provided.

     NOTE: Trend Micro does not recommend rolling back the kernel to the 
           previous version. If you encounter issues after installing 
           this critical patch, boot from the previous kernel as a 
           workaround.
     
           To boot from the old kernel:

           1. Restart the computer. 

           2. Press any key to access the boot menu.
     
           3. Choose the old kernel. Press "Enter" to start the selected 
              kernel.


  5. Post-installation Configuration
  ======================================================================
     No post-installation steps are required.

     NOTE: Trend Micro recommends that you update your scan engine and
           virus pattern files immediately after installing the product.


  6. Known Issues
  ======================================================================
     There are no known issues for this release.


  7. Release History
  ======================================================================
     For more information about updates to this product, go to:

     http://www.trendmicro.com/download


  8. Contact Information
  ======================================================================
     A license to Trend Micro software usually includes the right to
     product updates, pattern file updates, and basic technical support
     for one (1) year from the date of purchase only. After the first
     year, you must renew Maintenance on an annual basis at 
     Trend Micro's then-current Maintenance fees.

     Contact Trend Micro via fax, phone, and email, or visit our website
     to download evaluation copies of Trend Micro products.

     http://www.trendmicro.com/us/about-us/contact/index.html

     NOTE: This information is subject to change without notice.


  9. About Trend Micro
  ======================================================================
     Smart, simple, security that fits

     As a global leader in IT security, Trend Micro develops innovative
     security solutions that make the world safe for businesses and
     consumers to exchange digital information.

     Copyright 2016, Trend Micro Incorporated. All rights reserved.

     Trend Micro, InterScan, and the t-ball logo are trademarks of 
     Trend Micro Incorporated and are registered in some jurisdictions. 
     All other marks are the trademarks or registered trademarks of 
     their respective companies.


  10. License Agreements
  ======================================================================
     View information about your license agreement with Trend Micro at: 
    
     http://www.trendmicro.com/us/about-us/legal-policies/
       license-agreements

     Third-party licensing agreements can be viewed:
    
     - By selecting the "About" option in the application user interface

     - By referring to the "Legal" page of the Administrator's Guide