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Security Bulletin: Privilege escalation vulnerability affects IBM® Db2® Administrative Task Scheduler (CVE-2018-1711).

Security Bulletin


Summary

Db2 Administrative Task Scheduler (ATS) is vulnerable to a privilege escalation attack. A user with appropriate authorization can modify the contents of the control tables used by the ATS to permit unauthorized access to user data. Unauthorized access includes both access to authorizations held by other users as well as RCAC row permissions and column masks.

Vulnerability Details

CVEID: CVE-2018-1711
DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow a local user to to gain privileges due to allowing modification of columns of existing tasks.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/146369 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/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 and 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

Customers running any vulnerable fixpack level of an affected Program, V9.7, V10.1, and V10.5, 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: DB2 V9.7 FP11, V10.1 FP6, and V10.5 FP10. They can be applied to any affected fixpack level of the appropriate release to remediate this vulnerability.

 

Workarounds and Mitigations

If you rely on ATS, the only solution is to apply the fix, but you may consider using the Db2 or other audit facility to ensure no malicious changes are made to the affected tables. If ATS is turned off, you are not vulnerable. 

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Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

September 18, 2018: Original version published.
October 4, 2018: Fixed the incorrect number in the link to the 10.1 and 9.7 builds.
October 15, 2018: Updated link to Db2 V10.5 Windows 64-bit image.
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: 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 #: 0729983

Modified date: 28 November 2018


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