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

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 fix pack APAR Download URL
V11.1 FP4

IT26595

http://www.ibm.com/support/docview.wss?uid=ibm10741687

Workarounds and Mitigations

None.

Get Notified about Future Security Bulletins

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.

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


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