ESB-2017.2887 - [Win][Linux][HP-UX][Solaris][AIX] IBM Db2: Denial of service - Remote with user interaction 2017-11-14

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2887
        IBM Db2 is affected by vulnerabilities in the IBM SDK, Java
                            Technology Edition
                             14 November 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM Db2
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Linux variants
                   Solaris
                   Windows
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-9843 CVE-2016-9842 CVE-2016-9841
                   CVE-2016-9840  

Reference:         ESB-2017.1251
                   ESB-2017.1321
                   ESB-2017.1185
                   ESB-2017.2876

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg22010282

- --------------------------BEGIN INCLUDED TEXT--------------------

Security Bulletin: IBM Db2 is affected by vulnerabilities in the IBM SDK,
Java Technology Edition Quarterly Critical Patch Updates (CVE-2016-9840,
CVE-2016-9841, CVE-2016-9842, CVE-2016-9843)

Document information

Software version: 9.7, 10.1, 10.5, 11.1

Operating system(s): AIX, HP-UX, Linux, Solaris, Windows

Software edition: Advanced Enterprise Server, Advanced Workgroup Server,
Enterprise Server, Express, Express-C, Personal, Workgroup Server

Reference #: 2010282

Modified date: 13 November 2017

Security Bulletin

Summary

Db2 is affected by a vulnerability in IBM® JDK.

Vulnerability Details

CVEID: CVE-2016-9840
DESCRIPTION: zlib is vulnerable to a denial of service, caused by an
out-of-bounds pointer arithmetic in inftrees.c. By persuading a victim to open
a specially crafted document, a remote attacker could exploit this
vulnerability to cause a denial of service.
CVSS Base Score: 3.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
120508 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)

CVEID: CVE-2016-9841
DESCRIPTION: zlib is vulnerable to a denial of service, caused by an
out-of-bounds pointer arithmetic in inftrees.c. By persuading a victim to open
a specially crafted document, a remote attacker could exploit this
vulnerability to cause a denial of service.
CVSS Base Score: 3.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
120509 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)

CVEID: CVE-2016-9842
DESCRIPTION: zlib is vulnerable to a denial of service, caused by an undefined
left shift of negative number. By persuading a victim to open a specially
crafted document, a remote attacker could exploit this vulnerability to cause a
denial of service.
CVSS Base Score: 3.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
120510 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)

CVEID: CVE-2016-9843
DESCRIPTION: zlib is vulnerable to a denial of service, caused by a big-endian
out-of-bounds pointer. By persuading a victim to open a specially crafted
document, a remote attacker could exploit this vulnerability to cause a denial
of service.
CVSS Base Score: 3.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
120511 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)

Affected Products and Versions

All fix pack levels of IBM Db2 V9.7, V10.1, V10.5, and V11.1 editions on all
platforms are affected.

Remediation/Fixes

The recommended solution is to apply the appropriate fix for this
vulnerability.

The fix for this vulnerability is in latest version of IBM JDK. Customers
running any vulnerable fixpack level of an affected Program, V9.7, V10.1, V10.5
or V11.1 can download the latest version of IBM JDK from Fix Central

Affected IBM Releases:

  • 6.0.16.41 and earlier
  • 6.1.8.41 and earlier
  • 7.0.10.1 and earlier
  • 7.1.4.1 and earlier
  • 8.0.4.2 and earlier


Fixed IBM Releases:

  • 6.0.16.45
  • 6.1.8.45
  • 7.0.10.5
  • 7.1.4.5
  • 8.0.4.5


Refer to the table below to determine the IBM JDK level that contains the fix.
Then follow the instructions below to perform the JDK installation.

+----------------------------------------------------------+
|Db2 Release        |Fixed IBM Release                     |
|-------------------+--------------------------------------|
|V9.7.x             |6.0.16.45 or later                    |
|-------------------+--------------------------------------|
|V10.1.x            |7.0.10.5 or later                     |
|-------------------+--------------------------------------|
|V10.5.x            |7.0.10.5 or later (6.0.16.45 or later |
|                   |for LinuxIA64)                        |
|-------------------+--------------------------------------|
|V11.1.x            |8.0.4.5 or later                      |
+----------------------------------------------------------+

Instruction for IBM JDK Installation on UNIX
1) Create a new temporary JDK directory, i.e. jdk64, to store the extracted
install files.

2) Run the following command to extract all the files from the IBM JDK install
image tar file into the temporary JDK directory created in step 1 above.

tar -xvf <IBM JDK install image tar file> -C jdk64

3) Stop all DB2 instances for the installation.

4) As root user, create a new JDK directory.

Create a new JDK directory jdk64 under /opt/IBM/db2.
E.g.
mkdir /opt/IBM/db2/jdk64

5) As root user, copy the extracted files from the temporary JDK directory
created in step 1 to the new JDK directory.

E.g.
cp -R <Temporary JDK directory>/* /opt/IBM/db2/jdk64/

All the files in the /opt/IBM/db2/jdk64/ directory should have r-x permission.

6) Change the group and owner for all the files in the new JDK directory to
bin.
E.g.

chgrp -R bin /opt/IBM/db2/jdk64/
chown -R bin /opt/IBM/db2/jdk64/

7) Configure DB2 to use the new JDK.

E.g.
db2 update dbm cfg using JDK_PATH /opt/IBM/db2/jdk64/


Instruction for IBM JDK Installation on Windows
1) Stop all DB2 instances

2) Go to the DB2 installation directory
E.g
C:\Program Files (x86)\IBM\SQLLIB\java\jdk

Rename the following folders:

  • bin to bin_old
  • include to include_old
  • lib to lib_old
  • properties to properties_old
  • jre to jre_old

This might not work as you might get the error of folder in-use. If that
happens, try the following steps:

  • cd to C:\Program Files (x86)\IBM\SQLLIB\java\jdk\jre folder
  • rename bin to bin_old
  • copy lib as lib_old
  • cd to lib directory, delete all the files except the fonts folder (which
    might be held by windows svchost.exe process and might not be renamed)


3) Unzip the new java files and copy all the extracted java files under the jdk
directory.


Notes:
1) With this update, the metadata of the new JDK is not being recorded with the
installer. Hence, for fix pack update in the same installation path, execution
of the db2val utility (i.e. the tool that validate files laid down by the DB2
installer at the system level, instance level, or database level after new
installation) may fail . Fix pack update to new installation path is not
affected.

2) Uninstall will not be able to remove the jdk64 and jdk64_old folder, user
will have to remove it manually.

Workarounds and Mitigations

None.


Change History

November 13, 2017: Original Version Published

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF
ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY
ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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