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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.4118
  IBM Db2 could allow a local authenticated attacker to execute arbitrary
 code on the system, caused by DLL search order hijacking vulnerability in
                 Microsoft Windows client. (CVE-2020-4739)
                             20 November 2020

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

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

Product:           IBM DB2
Publisher:         IBM
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-4739  

Original Bulletin: 
   https://www.ibm.com/support/pages/node/6370023

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

IBM(R) Db2(R) could allow a local authenticated attacker to
execute arbitrary code on the system, caused by DLL search order hijacking
vulnerability in Microsoft Windows client. (CVE-2020-4739)


Document Information

Product:  DB2 for Linux- UNIX and Windows
Software version:  9.7, 10.1, 10.5, 11.1, 11.5
Operating system(s):  Windows
Document number:  6370023
Modified date:  19 November 2020


Security Bulletin

Summary

IBM DB2 on Windows could allow a local authenticated attacker to execute
arbitrary code on the system, caused by DLL search order hijacking
vulnerability in Microsoft Windows client. By placing a specially crafted file
in a compromised folder, an attacker could exploit this vulnerability to
execute arbitrary code on the system.

Vulnerability Details

CVEID:   CVE-2020-4739
DESCRIPTION:   IBM DB2 Accessories Suite for Linux, UNIX, and Windows, DB2 for
Linux, UNIX and Windows (includes DB2 Connect Server) could allow a local
authenticated attacker to execute arbitrary code on the system, caused by DLL
search order hijacking vulnerability in Microsoft Windows client. By placing a
specially crafted file in a compromised folder, an attacker could exploit this
vulnerability to execute arbitrary code on the system.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
188149 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

Affected Products and Versions

All fix pack levels of IBM Db2 V9.7, V10.1, V10.5, V11.1, and V11.5 editions on
Windows are affected.  Linux and Unix are not affected.

Remediation/Fixes

Customers running any vulnerable fixpack level of an affected Program can
download the special build containing the interim fix for this issue from Fix
Central. These special builds are available based on the most recent fixpack
level for each impacted release: V9.7 FP11, V10.1 FP6, V10.5 FP11, 11.1 FP5,
and V11.5.4. They can be applied to any affected fixpack level of the
appropriate release to remediate this vulnerability.

 

+-------+---------------+-------+---------------------------------------------+
|Release|Fixed in fix   |APAR   |Download URL                                 |
|       |pack           |       |                                             |
+-------+---------------+-------+---------------------------------------------+
|V9.7   |TBD            |IT34241|Special Build for V9.7 FP11:                 |
|       |               |       |                                             |
|       |               |       |Windows 32-bit, x86                          |
|       |               |       |Windows 64-bit, x86                          |
|       |               |       |                                             |
|       |               |       |(URLs will be updated when they become       |
|       |               |       |available)                                   |
+-------+---------------+-------+---------------------------------------------+
|V10.1  |TBD            |IT34240|Special Build for V10.1 FP6:                 |
|       |               |       |                                             |
|       |               |       |Windows 32-bit, x86                          |
|       |               |       |Windows 64-bit, x86                          |
+-------+---------------+-------+---------------------------------------------+
|V10.5  |TBD            |IT34239|Special Build for V10.5 FP11:                |
|       |               |       |                                             |
|       |               |       |Windows 32-bit, x86                          |
|       |               |       |Windows 64-bit, x86                          |
+-------+---------------+-------+---------------------------------------------+
|V11.1  |TBD            |IT34238|Special Build for V11.1 FP5:                 |
|       |               |       |                                             |
|       |               |       |Windows 32-bit, x86                          |
|       |               |       |Windows 64-bit, x86                          |
+-------+---------------+-------+---------------------------------------------+
|V11.5  |11.5.5.0       |IT34221|Build for V11.5.5 GA:                        |
|       |               |       |                                             |
|       |               |       |https://www.ibm.com/support/pages/node/      |
|       |               |       |6368787                                      |
+-------+---------------+-------+---------------------------------------------+


Workarounds and Mitigations

None

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References

Complete CVSS v3 Guide
On-line Calculator v3

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

This vulnerability was reported to IBM by Hou JingYi (@hjy79425575) of Qihoo
360 CERT

Change History

19 Nov 2020: URLs added for DB2 10.1
18 Nov 2020: Initial Publication

*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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