ESB-2018.3710 - [Win][Linux][HP-UX][Solaris][AIX] IBM Db2: Unauthorised access - Existing account 2018-11-29

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3710
 IBM Db2's RCAC rules are not being enforced by CTAS sub-select statements
                             29 November 2018

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

Product:           IBM Db2
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Solaris
                   Linux variants
                   Windows
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1857  

Reference:         ESB-2018.3484.2

Original Bulletin: 
   https://www.ibm.com/support/docview.wss?uid=ibm10734059

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Security Bulletin: IBM Db2's RCAC rules are not being enforced by CTAS
sub-select statements (CVE-2018-1857).

Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 11.1

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

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

Reference #: 0734059

Modified date: 28 November 2018

Security Bulletin


Summary

Db2's Row and Column Access Control (RCAC) rules are not being enforced when
creating a table using AS (CTAS) sub-select statements. RCAC is not enforced
when Db2 uses the 'WITH DATA' clause to select and insert data into the target
table.

Vulnerability Details

CVEID: CVE-2018-1857
DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server)
could allow a user to bypass FGAC control and gain access to data they
shouldn't be able to see.
CVSS Base Score: 4.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
151155 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N)

Affected Products and Versions

All fix pack levels of IBM Db2 V11.1 editions on all platforms  are affected.

Remediation/Fixes

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

FIX:

The fix for DB2 release V11.1 is in V11.1.4.4, available for download from Fix
Central. 

+---------------+----------+----------+--------------------------------------------------------------------+
|Release        |Fixed in  |APAR      |Download URL                                                        |
|               |fix pack  |          |                                                                    |
+---------------+----------+----------+--------------------------------------------------------------------+
|V11.1          |FP4       |IT26595   |http://www.ibm.com/support/docview.wss-uid=ibm10741687              |
+---------------+----------+----------+--------------------------------------------------------------------+

Workarounds and Mitigations

None.

Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

November 5, 2018: Original version published.
November 28, 2018: Updated 11.1 version with a link to 11.1.4.4 image.

*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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